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  • Products: Carburetion


    Forget what you thought you knew about the best carbs for vintage cars.

    Our Mikuni Carb Kits have changed Everything!!

    We still use DCOE Webers for vintage and historic racing, but any car that came with SU or Z. Stromberg carbs will show significant improvements in all aspects of performance by simply changing to the Mikuni HSR carbs. 

    See the new photos and customer comments at the end of the Mikuni Carb Section below and the photo article on installing the Dual Kit in an MGB. http://www.v-performance.com/articles/mgb_-_dual_mikuni_installation_.html

    In 2003 we needed improvements to the typical SU and Weber carb setups for use on our Volvo performance and supercharged engines. The result was a year of searching and testing that lead to the conclusion that the Mikuni HSR carbs were clearly the best option. 

    During that year of testing numerous carbs were evaluated both on the street and the dyno.  The carbs tested included various versions and sizes of the traditional SU, ZS, Weber sidedraft, Weber downdraft, and a few less commonly used carbs like the Weber 45 MCHH which was offered as an SU replacement. The testing included both stock and modified versions of the carbs.  Test criteria included cost, power, throttle response, fuel economy, ease of installation and tuning. After over a year of work,  the carb that came out best in all categories  for a wide variety of applications was clearly the Mikuni HSR series of carbs.  Other carbs still have their place - where an original equipment look is required for shows or to meet competiton rules.  But for street driving with a stock or modified engine, or racing where the rules allow a modern replacement carb, these are the carbs to use - especially if your car was originally equiped with one or more of the SU or Zenith Stromberg carbs the HSR Mikunis were specifically designed to replace.

    Over the winter of 2010/11 we did a comparison of our Quad 45mm Mikuni HSR carbs vs sidedraft Webers. After running the Mikunis on one of our 2.5 L B20 engines, we installed the 45 DCOE carbs that are usually on my racecar.  After finding the engine significantly down on power compared to dyno runs with the Mikunis, we stepped up to a pair of Weber 50 DCO race carbs, first with 42 mm chokes and then with 46 mm chokes. Even with the 46 mm chokes, the power output was lower than with the Mikunis, with higher brake specific fuel consumption, while loosing power at lower rpm. The result - the Mikunis were the clear winner.

    Quad 45 Mikunis on the left vs Weber 50 DCO race carbs on a 2.5 L Volvo B20.  The Mikunis were the clear winner in power, throttle response and fuel economy. While doing the testing, we developed a new emulsion tube system for the Mikunis.                                                                               

    In 2012 we dyno tested a stock MGB with SU carbs. We then removed the SUs, and installed a pair of 42 mm HSR Mikunis.  With no other changes to the MGB, we were surprised to get a 20% increase in power,  along with a degree of increased throttle reponse that had to be felt to be believed. Overall it completely transformed the driving experience.

    The chassis dyno charts below show the comparison between the stock MGB with SU carbs and the same car with our Mikuni HSR carbs. The horsepower scale is on the left, recorded as corrected horsepower at the wheels. Vehicle speed is on the bottom. The tests were conducted in 4th gear. 50 mph is 3000 rpm. The red line is corrected wheel horsepower of the stock MGB with stock SU carbs. 

    After testing with the stock setup, we installed our Dual Mikuni Carb Kit with 42 mm HSR carbs. The black spacers, heat shield openings, and intake manifold openings were slightly enlarged to match the size of the 42 mm carbs, tapering from larger to smaller toward the engine. No other changes to the carb or engine were made. We were surprised by an increase of 13 HP, approx 22 %. What can't be shown is how much more fun to drive the car was, with instant throttle response that kicked the car forward when you hit the gas.  Note that there is no loss of low end power.

    The dyno chart below shows the same comparison as above with another test added. On this chart the green line is the stock engine with stock SU carbs. The red line is the same stock engine with dual Mikuni 42mm HSR carbs. The top blue line is from another test session. This was a dyno test , on the same chassis dyno under similar conditions, of a 1979 MGB with modified engine, header and high flow exhaust, ported head and "fast road cam", along with the same 42 mm Mikuni HSR carbs, showing the true potential of this setup. All figures are in corrected horsepower at the wheels.



    Mikuni HSR Series Carbs

    MGB, Sunbeam Alphine and Triumph TR6 Mikuni installations are shown in the photos above.  More photos of MGB and TR6 installations can be found below and in the Tech Articles in the "More Info" section of this website.

    After 10 years of testing and use, and hundreds of installations in various cars, Mikuni HSR carbs have proven to be superior in power, throttle response and fuel economy.  I strongly recommend them for a wide variety of applications. They were designed to replace SU and ZS carbs and are a simple replacement for those carbs. The HSR Mikunis are one of the few easily bolted on upgrades that produce a signficant, surprising and easily documented, increase in performance with no other modifications. Our customers who are already using them praise and recommend them. (see the customer comments at the bottom of this section for personal experiences) :

    1) as a stock replacement or upgrade from SU, Zenith Stromberg, or Weber carbs. 

    2) for Volvos, MG, Triumph, Datsun, Mini, Spitfire, Jaguar, Lotus, SAAB, Sunbeam Alpine, etc.

    3) in one, two, three, four, six or 8 carb applications.

    4) for stock, street, modiified, supercharged, turbo and racing engines.

    Technologically superior in design to the typical SU, Zenith Stromberg or Weber carbs that were originally designed more than 50 years ago, the Mikuni HSR flat slide is a modern carb, designed specifically as a bolt-on SU or ZS replacement that will do it all - more power, better fuel mileage and easy tuning in one package. These advances are made possible by several innovations, including the use of a flat throttle plate or "Flat Slide" derived fom racing fuel injection systems which allows for increased air flow and produces extremely high manifold vacuum, aiding in fuel atomization while increasing port velocity. 

    Above is an SU HIF 44 on the left compared to a Mikuni 45 HSR on the right. Note the size of the Mikuni's unabstructed flow area- the key to its higher flow capacity.  The Mikuni is 45 mm all the way through without a smaller venturi area or throttle plate to restrict air flow.

    Compared to SU carbs, a similarly sized Mikuni HSR will flow 30 - 40% more air. They will provide better throttle response, support more power - especially at higher rpms, and will equal or exceed the SU in fuel economy.  In road and dyno testing dual Mikunis have equaled or exceeded Weber sidedrafts in power while getting 50% better fuel mileage - at less than 2/3 the cost, using the stock SU or ZS intake manifold. Customers are amazed by the degree of performance improvement as well as the ease of installation and tuning. If you are interested in your vintgage car's performance, including its reliability, there is no reason to stick with obsolete, leaky, hard to tune SU carbs or having to chose between a sidedraft Weber for power or a downdraft Weber for economy. The solution is an upgrade to the Mikuni HSR carbs.

    Mikuni carbs mounted

    The Mikuni carb kit

    All carbs in these kits have been modified for automotive use. Prices include the cost of parts and labor needed for the modifications and manifold adapters.  Prices below include May 1st, 2014 increases.  Since the carbs that they are replacing are the same, the same basic kits can be used for installations on a variety of different cars with some changes in jetting and throttle linkage.

     Single Carb Kits:

    • Single 42 or 45 mm Carb Kit, modified for automotive use, for cable throttle with manifold adapter, without an air filter - $395 
    • Single 42 or 45 mm Carb Kit - Modified for Supercharger Applications - for cable throttle , without an air filter - $465
    • Add $50 for a carb modified with extended throttle shaft for lever type throttle linkage
    • Add $45 for black top K& N  filter - $50 for chrome top K&N filter  

    Dual Carb Kits:

    Replaces 2 SU or Zenith Stromberg carbs on a 4 or 6 cylinder motor  - $ 895.  With K & N black top air filters -$ 985 . With chrome top filters - $ 995

    Weber DCOE Sidedraft Replacement -  two HSR carbs mounted as one dual barrel carb -$ 985 without air filters 

    Triple Carb Kits:

    Replaces 3  SU or ZS Carbs on a 6 cylinder motor - $1330 without air filters.  $1470 with 3 black top K & N filters, $1490 with 3 K & N chrome top filters.

    Quad Carb Kits:  

    Four  carbs modified to mount in pairs on weber sidedraft type manifolds - includes manifold mounts and linkage adapters  $1955

     Six Carb Kits:

    Six Carbs modified to mount in pairs on Weber sidedraft type manifolds - with manifold mounts and linkage adapters  - $ 2920

    See a more detailed description of the Mikuni HSR Carbs, each kit, and installation and tuning parts below:

    Originally designed and marketed as a performance replacement  for SU carbs on Harley Davidson motorcycles, the size of the 45 mm Mikuni, essentially the same as the 1 3/4 inch bore or an HS6 SU, and incorporation of an accelerator pump jet makes it perfect for automotive applications. Carburetor development for automobiles stagnated more than 30 years ago when automotive manufacturers turned to fuel injection to meet emissions and fuel economy requirements, while at the same time, the evolution of carburetor design for motorcycles, snowmobiles and jet skis continued at a rapid pace.  The Mikuni flat slide is the most advanced product of those years of continuing development which began with the traditional SU carb of the 1950s.The result is a carburetor that is superior both in power and fuel economy as well as being reliable and easy to tune and maintain. Parts are less expensive and fewer in number than in most automotive style carburetors.

    For a flow rate comparison, measured at a pressure difference of 12 inches of water, Mikuni rates the carb flow as follows:
    Mikuni HSR42: 213 CFM
    Mikuni HSR45: 237 CFM
    Mikuni HSR48: 270 CFM

    Our Mikuni carb kits are designed to make the Mikunis an easy, bolt-on replacement for SU or ZS carbs, right on the stock SU or ZS manifold. They will fit in the same space as the original carbs, are the same length front to back with manifold adpater as an HS6 SU,  measure  7.5 " from the manifold to the outer end of the most commonly used K & N filter, and in most applications will attach directly to the stock linkage.   The dual kit includes two carbs, two carb to manifold adapters, a throttle shaft, linkage to adapt to the SU or ZS linkage, and two K & N air filters. Similar kits are available for single and triple carb applications. As with any carb swap, expect to do some tuning to match these carbs to your engine and get maximum performance and fuel economy. Tuning recommendations and jet kits are available.                                                                                                                                                                                                                                                    

    Mikuni carb kitIn the Mikuni specific jets meter fuel for various throttle openings. Compared to a sidedraft weber, tuning is much simpler, cheaper and more direct since there are no emulsion tubes, replaceable venturies or the need to guess as to what the result of a change will be. It is hard to describe how much of a pleasure tuning these carbs can be, as compared to SUs or Webers. You really have to experience it to fully comprehend the difference.

    For additional details on these carbs, a complete tuning and parts manual is available online from Mikuni. Go to www.mikuni.com/fs-manuals.html and click on "HSR tuning manual."

    Our installation and Tuning Instructions are in the "More Info / Tech Articles" section of this Website.            Take a look at it even if you are just considering a purchase as it has much more detail on the carbs and their installation.  There is also a photo spread detailing the installation on an MGB and another underway on the TR6 dual carb installation.

    All of our carbs sold for automotive use are modified to accommodate the higher fuel pressures of automotive fuel systems as compared to the gravity feed systems used in motorcycles. They have also had the main jets that come with the carbs replaced with main jets more suited to the individual application. In multi-carb kits the stock throttle shafts have been replaced with longer, custom made throttle shafts which allow the shafts to be connected and the carbs easily synchronized. These modifications are built into the price of each kit.  Additional jets to fine tune the carbs to your application are extra. Add $25 per carb to the below prices for 48 mm carbs.

    Order note - The carbs for the kits listed below are modified on a custom basis per application based on information that you give us about your car, engine. linkage, etc. This means that there is usually a delay between the time of order and date of shipping that could range from a couple of days to a couple of weeks depending on the degree of modification needed for the particular kit ordered, availability of the specific carbs and air filters ordered and the parts required to modify the carbs to match your application. Please ask about estimated shipping time before or at the time that you place your order.

    Due to increases in our costs, carb and kit prices were increased on May 1st.

    The Dual Mikuni Kit

    Our most popular kit. The Dual Kit for SU or ZS type manifolds consists of 2  HSR 42mm or 45mm carbs modified with extended throttle shafts, smaller float bowl needle and seat, and larger main jets. The kit includes manifold adapters and linkage designed to connect to the stock linkage - $ 895.  With K & N black top air filters -$ 985 . With chrome top filters - $ 995. Add $ 50 to the above prices for the kit with HSR 48 mm carbs.  Several sizes of filters are available.

    The included manifold adapters allow the carbs to fit on any manifold designed for similarly sized SU or Zenith Stromberg carbs. Minor differences in linkage are usually easy to adapt. Since it is replacing the same carbs whether on a Volvo, MG, Triumph, etc., the kit is the same for each of these applications except for differences in jetting.

    Choke cables and/or choke cable adapters are not included as the car's original choke cables can normally be used with minor modificatio, however some cables are now available for specific applications.

    The Dual Kit now includes one pair of larger main jets.  Extra main jets - $ 6.00 a pair - recommended . Smaller pilot jets and larger needle jets are also recommended for most applications. See our tuning kits below for details.

    Other parts frequently ordered along with the kit above include:  Volvo SU aluminum intake manifold - silver ceramic coated $110  - $55  Used, uncoated $55. Extra main jets $ 6.00 per pair - 2 pairs of larger mains recommended. Accelerator pump jets $8 per pair. Needle jets $12 each.   Short idle adjust screws - $15.00 each.

    Conversion from single carb to dual carbs -  If you have a Volvo, MGB, Triumph Spitfire or other car model that came in both single and dual carb configurations we may be able to help you convert to two carbs by providing a dual carb manifold.  Email for details.

    Dual Mikuni - Single Weber DCOE Replacement Kit

    This kit is essentially half of the Quad Kit described below. Two Mikuni HSR carbs are modified and ganged together to replace a single Weber Sidedraft carb on a single carb manifold.  $ 985 without air filters. Weber style filters can be used with adapters.

    The Mikuni Triple Kit

    Similar to the dual kit, but designed to replace SU or ZS carbs on a six cylinder engine. The kit consists of  3  HSR 42mm or 45mm  carbs modified with extended throttle shafts, smaller float bowl needle and seat, and larger main jets. Includes manifold adapters and linkage designed to connect to the stock throttle linkage. Aftermarket manifolds, not included in the kit, allow two carb setups like the Triumph TR6 to be converted to 3 carbs.  $1330 for the kit without air filters.  $1470 with 3 black top K & N filters, $1490 with 3 K & N chrome top filters. Several sizes of filters are available.  Add $420 for polished carbs.

    The Mikuni Single Mount Kit

    The Mikuni Single Mount Kit is a perfect replacement for cars with a single SU or Zenith Stromberg carb. Available with a choice of  HSR 42mm, 45mm or 48 mm carb, the basic kit includes one carb modified with a smaller needle and seat for higher fuel pressure, larger main jets, with a mounting flange adapter to adapt to your manifold. A throttle cable mounting bracket is also included. Throttle and choke cables are not included but can be provided on a custom basis.

    • Single 42 or 45 mm Carb Kit, modified for automotive use, for cable throttle with manifold adapter, without an air filter - $395 
    • Single 42 or 45 mm Carb Kit for supercharger applications - for cable throttle with modified float bowl, accelerator pump and jetting modifications to meet the demands of supercharged operation, with manifold adapter, without an air filter - $465
    • Add $25 to change either of the above to a 48 mm carb
    • Add $50 for a carb modified with extended throttle shaft for lever type throttle linkage
    • Add $45 for black top K& N  filter
    • Add $50 for chrome top K&N filter

    For a more formal look, polished versions of each carb are available. To substitute polished carbs in any of the kits, add $140 to the listed price for each polished carb added.

     

     Single Mikuni HSR on a Mini

     Single Mikuni on an MG Midget

    Our Single Mikuni Kit on a Moss Motors Supercharger in an MGB

    Upgrade your Supercharger Kit with a Mikuni.

    The photos above and to the right show one of our modified HSR 45 Mikuni carbs replacing the SU carb that originally came on this Moss Motors MGB supercharger kit. When we first saw this kit we questioned why they would take a modern supercharger and put an ancient carb on it.  We later found out that Moss had in fact experimented with using a stock Mikuni HSR carb, but had experienced problems with hesitation that they could not solve.  Since we had learned how to eliminate this problem as part of the testing and development process when we switched from a Weber DCOE to a Mikuni HSR Carb on our Volvo supercharger systems, we knew how to  make it work on the MG. The big change is that the carb float bowl has been modified to increase the capacity of the accelerator pump by approximately 50%. With this modification and proper tuning we can provide a Mikuni carb that is a tremendous upgrade for the Moss Motors kit or any other supercharger kit or application that uses an SU or ZS carb.  The basic kit includes the carb with our standard modifications for automotive applications, with a modified float bowl and larger accelerator pump added, with two larger main jets, one larger than stock needle jet, one larger accelerator pump jet, and a mounting adapter that allows it to be bolted on in place of an SU or ZS carb - $ 465.  Air filters and other parts can also be supplied.  Additional main jets are recommended for fine tuning.

      

     

    The Quad Mikuni Kit --  The Ultimate Performance Carb Kit

    A unique and totally cool setup! 4 HSR Mikuni carbs, modified to mount as pairs on  Weber DCOE or DCO  type manifolds, using similar linkage, for large displacement and high HP racing and street 4 cyl. engines. Will easily outflow Weber carbs of similar sizes due to the much cleaner air flow path and better fuel atomization. Comparison dyno testing has shown that a set of 45 Mikunis will easily out perform a set of 50 DCO Webers with higher HP and torque from low to high RPM, while using less fuel. These sets are produced in our shop on a custom basis so allow time for machining and assembly.  For air filters see the ITG filters in the filter section below.

    • Four  carbs modified to mount in pairs on weber sidedraft type manifolds - includes manifold mounts and linkage adapters  $1955
    • Four carbs modified to mount in pairs on weber sidedraft type manifolds - includes manifolds, manifold mounts  & linkage adapters, for Volvo B20/21/23/230 including a Weber DCOE style intake manifold, air filter adapters & air filters - $2455  - $2580 depending on choice of air filters and type of air filter adapter
    • Email for kit prices which include manifolds and air filters for non - Volvo applications
    • Six Carbs modified to mount in pairs on Weber sidedraft type manifolds - with manifold mounts and linkage adapters  - $ 2920  Email for details.

     

    Mikuni Parts
    Volvo SU aluminum intake manifold - bead blasted and silver ceramic coated $110 .  Used, uncoated $55.
    Main jets $3.00 each  - 2 sizes of larger than stock mains are recommended and supplied with each kit.
    Accelerator pump jets $4 each.
    Needle jets $12 each.  Two sizes larger than stock are available.
    Re-profiled jet needles $22 per pair. 
    Pilot jets - $ 4 each.
    Short idle adjust screws - $15.00 each.
    Float Bowl Needle and Seat sets - $ 18.50 each.  Our Mikunis are supplied with the 2.3 needle and seat for automotive applications.
    Holley fuel pressure regulator - 1 - 4 psi -  $36.5
    Adapter collars to allow the use of non clamp-on type air filters - $22.50 each.( They  need to be drilled and tapped to match the bolt pattern of the air filter to be bolted on. )
     
    HSR Carb Tuning Kits with recommended jet selection -
    Purchasing a kit at the same time as a set of carbs allows us to custom jet the carbs for your application and include two extra complete sets of jets, one a step leaner, and the other a step richer than those installed - really handy for fine tuning. 
    Most applications will need larger than stock needle jets and smaller than stock pilot jets - included in the kits.
    Dual Kit  -  $76  With two pairs of needle jets - $52 with one pair
    4 main jets -  one size larger, one size smaller - large throttle opening tuning
    4 pilot jets - two sizes smaller than stock  -  low throttle opening tuning
    4 needle jets - two sizes larger than stock  - helps richen the midrange
    Single Kit  -  $38 With two needle jets -  $26 with one
    2 main jets -  one size larger, one size smaller - large throttle opening tuning
    2 pilot jets - two sizes smaller than stock - low throttle opening tuning
    2 needle jets - two sizes larger than stock  - helps richen the midrange
    Triple Kit -  $114 With two sets of needle jets - $78 with one set
    6 main jets -  one size larger, one size smaller - large throttle opening tuning
    6 pilot jets - two sizes smaller than stock - low throttle opening tuning
    6 needle jets - two sizes larger than stock  - helps richen the midrange
    Quad Tuning Kit  -  $ 152  With two sets of needle jets - $104 with one set 
    8 main jets -  one size larger, one size smaller - large throttle opening tuning
    8 pilot jets - two sizes smaller than stock  -  low throttle opening tuning
    8 needle jets - two sizes larger than stock  - helps richen the midrange
     
    Choke Cables
    Universal and MGB Style Choke Cables - single cable  $33.00
    Cable Splitter $34.50
    Cable Splitter with two end cables  - $47.50
    Kit with Choke Cable, Cable Splitter and End Cables to the carbs - $ 78.50
     
    Parts required to convert 2 stock, motorcycle type, HSR carbs to extended throttle shafts with automotive type throttle linkage for mouning on SU or ZF dual carb manifolds :
    Throttle shafts -  $46.50 each, two needed.
    Couplers -  $22.5 each, two needed
    Connecting shaft  - $10.50  one needed
    Lever arm -  $6.50 one needed
    Carb to manifold adapters for 42, 45, and 48 mm carbs - $30 - two needed
    Float Bowl 2.3 Needle and Seat sets - $ 18.50 each  - two needed to replace stock 4.0 size used for gravity feed applications
    Total on parts needed to convert and adapt two carbs: $ $252
     
    New emulsion tube conversion kit - Adds an air jet and modified needle jet to create an emulsion tube system - another Vintage Performance innovation $29.50 per carb.
     
    Dual Mikuni Kit on a Morgan
     
     
    Triple Mikuni Kit on a Holden

     

    The Dual Mikuni Kit in a Datsun 510

     

    Datsun 1600 Installation

     

    Several MGB Installations are Pictured Below.

    See the more detailed series of MGB installation photos and comments in our Tech Articles Section found through the "More Info" tab at the top of the page. Note that the HS4 SU carb is a 1.5" or 38mm carb. We replace them with 42m Mikunis ( 1.65" ).  This requires that the intake manifold opening, and/or spacer be enlarged slightly to match the larger carb size and considerably improves the air flow into the manifold. The result is an increase in power throughout the normal rev range including at low rpms.

     

       

    MGBGT

    Mikuni 45s and Crossflow Head

    Aluminum Cross Flow Head with 45mm Mikunis

     TR4 Installations

     Triumph GT6

       

    Triumph TR6

    Our TR6 system shown in the photos above uses the stock throttle linkage and choke cables with small modifications to both.

     Triumph Spitfire - Vintage Racecar

     See the story on this car and the Mikunis at: http://www.britishracecar.com/RichardBrown-Triumph-Spitfire.htm

                           And now a photo of a Jag E type installation

    See the comments on this installation in the comments section below - 8/21 - James Woolbright

    Installations on cars not listed as having documented Mikuni HSR Carb installations.

    We are always looking to do installations on cars we have not done installations on yet. To encourage such installations we still offer free installation in our garage and/or extra technical assistance which could include extra jets, fabrication of brackets, thorttle linkage, and air filter adapters if needed. In exchange we hope to get photos and feedback from the purchaser that can be used on our website and that will help other customers.  Where the car is near us, we will do the installation free in our shop.  Just about any car from the 50's, 60's or 70's that came with SU or Zenith Stromberg carbs will benefit from a switch to Mikuni HSR carbs.
     

    Comments on MIkuni Carb Installations

    10/8/2014 1:35 PM, Svein Astad wrote:

    Hi Mr. Parker

    Five years ago I bought a single mikuni hsr 42 mm carb from you, for my Volvo 144 B20A stock engine. The carb has been working perfectly for five years, but now the time has come to do some engine modifications ... ( so I need to order parts for the dual carb setup ).
    Best regards,
    Svein Astad

     9/11/2014 10:21 AM, Ron Swaine and Glynis Hart wrote regarding their TVR 2500M dual mikuni installation:

    Carbs have met all my expectations and more. My car is running much better than with the original Strombergs.
     
    I settled on 22.5 pilot jets. I found the car idled a little rich with the 25s.
     
    I raised the jet needle and that improved throttle performance. Just where it needs to be.
     
    Main jets unchanged.
     
    I disconnected the chokes. Found they were unnecessary to good operation.
     
    Very happy!
     
    Ron

    8/21/14 August 21, 2014 at 9:35:09 PM EDT 

    James Woolbright on his Jag E type triple Mikuni installation.

    My first impression was the sound. Much quieter than I was accustomed to with the Triple SU's when I initially started it.
     
    However, the odd thing was that I pumped the throttle 2 times.. hit the starter and I was off and running.  Idle a little low so it wouldn't stay running. So gave a quick idle adjust and it just sat there purring.
     
    So off for the first drive.  Wanted to give them a Wide open throttle test as the E-Type 4.2 creates SO much power that it's no fun idling around.
     
    Let me just say that without doing 1 single adjustment the car TAKES off runs like it NEVER has before.  It's so much noticeably smoother than the SU's that I almost can't believe it.  These carbs work incredible well.  Let me just say that I am beyond impressed.   I haven't had to much of a chance to do any highway driving but from what I've seen so far I can tell you that I love the carbs. As it stands right now it seems that no adjustments in jets are necessary.  It now confirms that it was WELL worth the wait for the Carbs.

     

    3/4/14  Henry Thomas on his triple 42 mm Mikuni HSR carb TR6 - TR 250 installation:

    Finally got some time and have installed the carb's and a 123 ignition and tuned everything on the dyno. I am happy to say that the mukunis are performing the way you indicated that they would and in my earlier test drives it was very apparent that the throttle response was much  better than the Stromberg Zeniths....After everthing was put back together last night the dyno results showed better low end torque and an increase in hp to 139 hp.  At that point we added our new custom made cold air inlet tube and got even more torque and the hp numbers went up to 148 hp at the rear wheels. Thanks for your interest in how things were going.
    Henry Thomas 

    On 8/25/2013 9:29 PM, Jon Glommen wrote about his TR6 installation:

     Hi John,
     I am very, vey happy with these carbs. Right out of the box they are great. I have to admit, I have not had time to adjust them beyond setting the idle. This winter, I’ll install chokes and fine tune. I may even fabricate a slick throttle linkage.
     I am so happy with these carbs that I have not bothered to tune any further. I’ll let you know the outcome.

     -Jon

    On 5/31/2013 11:11 AM, Mark Seredowych wrote:
    MGB with cross flow head and Mikuni Carbs.
    It really screams...
    
    
    
    
    

    1/7/13   Dual 42s on Triumph GT6

    I have got it started up, and I am amazed at the difference.  Smooth as
    silk, instantly responsive.  I should have done this a year ago!
    
    Instant throttle response and lots of power!
    
    Regards
    Mike Chilton
    -------------------------------------------------------------------------------------------------------
    
    From: <boutsicaris>
    Sent: Friday, August 17, 2012 9:05 PM
    Subject: excellent upgrade! Mikuni carb
     

    The new carb setup is amazing. I have a smooth and consistent idle for the first time in years. The car has more pep up hills and the throttle response is quick. I am very pleased wiith the 45 mm Mikuni carb setup and your technical support. I am looking forward to showing this to to local Triumph club. Thanks for providing this great product-a happy Triumph Spitfire owner.

    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

    5/16/11    Carbs worked well!  Start up, both cold and hot much improved over SU's  Engine will keep pulling all the way to the end of the strait at Summit Pt. SU's would fall flat about 3/4 down.  Throttle response MUCH IMPROVED!    RICH IS ONE HAPPY CUSTOMER!    -     Nick  - ( installation in a vintage race Spitfire for the Jefferson 500 )

    5/18/11    The Triumph was great at Summit Point this past weekend. The Mikunis performed terrifically....                      Nice Job.Thanks.    -      Rich Brown

    See the story on this car and the Mikunis at: http://www.britishracecar.com/RichardBrown-Triumph-Spitfire.htm

    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

    John,    The carbs are working great and are as easy to jet as I rembered from my MX days. Unfortunately I wasn't able to get a dyno comparison between the Mukuni's and the ZS's. I can tell you I shaved 3 seconds off my lap times though. The throttle response is excellent.

    The Mikuni HSR 45's are fantastic. They flow the same as the Weber DCOE 45's, have accelerator pumps and you can buy parts at any Harley shop. They were designed as a direct replacement for SU's ot ZS's.
    I picked up significant horsepower and they give a real kick in the pants coming off corners. Super easy to jet too. One of the single best things I've done for my car.

    Jim Gray  TR4 Vintage Racer

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    11/9/09  -  Hello John, this is Bob Thompson with the Sunbeam Alpine. Your website looks awesome. I just want to say hello and I am still enjoying the living shit out of my carbs! Quite possibly the easiest improvement I have ever done and it has not required any messing with it!
     I am now thinking hard about a 5 speed tranny!
    So thanks Again
    Bob T.
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    From: "Kevin Hall" <timberline@xxxxxxxxxxx>

    Date: Fri, 12 May 2006 22:41:33 -0400

    One serious benefit is that you don't require the aid of Merlin to set orjet the things. They respond to jetting changes and adjustments exactly as you would expect, which cannot be said for the old SUs. Jets and parts are much cheaper than they are for SUs or ZS units, and they are much moreeasily available through better bike shops.

    The only slightly awkward bit in the installation was the choke hook-up.The carbs each have individual plunger chokes, which I linked to the choke cable in the car by means of a dual-carb cable splitter box meant for a Norton Domi. Those are available through classic bike shops, and are notexpensive. You need to do a bit of messing about getting the inner and outer cable lengths right, but it is simple once you get at it.

    I've messed about with SUs for the best part of 40 years, but the only reason I'd go back to them would be if I were doing a complete concours resto. For a daily driver or a brisk hobby car the Mikunis are light years ahead of the game.

    KH 

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    Feb. 14, 2006   Mikuni Update  Volvo

     On the highway, I seem to be going 10 mph faster all the time. I tend to drive at a speed where everything "feels" comfortable, a "sweet spot" if you will... The "sweet spot" is now 10 mph faster!!  Did a gas mileage check and I am right at 24 mpg and that includes a lot of stop light to stop light "scooting" about! not bad, really. A real improvement over the SUs!!  The sound the motor makes with the Miks is quite a bit different from the SUs. Thing now has quite a growl. Sounds a bit unusual.

    Thanks John.  Mike  Twombley

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    Weber Carbs

    Weber DCOE carburetorsDual side draft DCOE Weber carbs - the classic performance and racing carb for vintage sportscars. Available used  and new, in 40, 42, 45 and 48 mm sizes and can be set up for specific applications and matched to manifolds, porting, cam, etc. Linkage and air filter kits also available. We are not a traditional "dealer" of these carbs and cannot match discount pricing - but with a purchase from us you get advice and help with setup and tuning that can be "pricless". Discount dealers send you the carbs in a box, with the same jetting no matter what the application is, usually with the cheapest manifolds and linkage available,  and let you figure out how to make it work.

    These carbs are still the standard for vintage racing, though the Mikunis described above are  now a better choice for street use and racing where a period correct carb is not required.  Production of Weber carbs has been intermittent in the last few years ( as has quality ) but they are now available again, including the newer type 152 - 45 DCOE - $835 a pair , and the classic and hard to find classic Type 9 - 45 DCOE - $935 a pair . Email for current pricing on other sizes.

     

     

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    Intake Manifolds

    Manifolds for sidedraft - DCOE type carbs

    Available forVolvo  B18, B20, B21, B23, B230 engines. These are copies of the original, no longer available, R- Sport manifold . They should not be confused with the cheap, shorty manifolds usually offered in Weber kits that have flow restrictions due to their short length and comparatively tight bends. In a recent dyno test we gained 12 HP by switching from the commonly sold “shorties” to our longer manifolds.  With the longer manifolds and suitable air filters, the inner fender on certain models - 1800 & 122 - should be modified for clearnace. See installation photos for examples.

    Recommended for all installations with Weber DCOE type carbs ( and similar sidedrafts ) and our Quad Mikuni System. Mandatory for racing, rallying and large displacement engines $355 - includes soft mounts. 

    SU intake manifolds

    These are the original aluminum intakes used on the early dual SU carbed Volvos. A significant improvement in performance applications over the later cast iron combination intake and exhaust manifolds.

    Silver ceramic coated aluminum - $135 Uncoated - $85

     

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    Linkage

    Throttle Linkage Lever Arms - Top quality, custom made, machined aluminum throttle linkage arms for Weber sidedraft  and other similar carbs - $ 33 each.  Email or call for prices and availability of other linkage components including custom made, braided stainless steel throttle cables.

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    Air Horns

    Full radius aluminum air horns - in several lengths for Weber DCOE, DCO and similar type carbs. Lengths start at 35 mm and go up from there.  Prices start at  $ 62 for the short ones for 45 DCOE carbs and $78 for the short ones for DCO carbs. Prices go up a small amount for the longer ones.

    The air horns shipped with Weber carbs are basically for decoration only. In dyno testing on Volvos we usually get better power with them removed. The full radius horns really work to improve flow and are available in several lengths to help with tuning. On our Volvo engines we usually find that the shorter horns work best as in the photo below.

    Below are Mikuni air horns with screen type filters - perfect for race applications  - $130 a pair with screen filters - or $36 for each horn and $30 for each filter.

    Mikuni air horns with screen filters on Jim Grey's TR4 vintage racer

     

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    Filters

    ITG Foam Air filters - Imported from England for sidedraft carbs - email for details and pricing.

    Available in various sizes, the rounded shape allows them to fit where square filters will not.

    Mandatory for use with Weber sidedraft carbs and the longer manifolds on the Volvo 1800.

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    Accessories

    Mikuni HSR jets - main jets - $5.50 per pair. Accelerator pump jets $8 per pair. Re-profiled jet needles $15 per pair.

    Soft mounts and spacers for SU and other carbs in performance applications - email for details.

    Weber DCOE Jets and Accessories Main jets $6. Air correction jets $6. Idle jets $7. Email for prices on other jets and accessories. 

    Used Weber Sidedraft carbs We usually have used Weber DCOE carbs in stock. Email for availability and pricing.

    Holley fuel pressure regulator - 1 - 4 PSI -  $36.50

     

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    >> Questions - Order Process - Payments

    Questions -Email correspondence strongly preferred. Email with questions on your particular needs as we have many other parts and services available. If we don't have it we can usually get it or make it. If you need to call, try 315 478 1229 mornings 9:00 AM - 12:00 noon eastern time. Leave a message if there is no answer as we may be in the shop and cannot get to the phone, or try cell # 315 440 6560 if necessary, but if you have to leave a message, leave it at the main number. There are often periods of 3 - 5 days, especially during the summer, when we are gone due to racing and other commitments. Calls and emails are replied to when we return.

    Orders - The easiest way to or is to send an email your parts order along with your address and we will reply with information on parts availability and a total price with shipping. Please include information indicating the car model & year with each email, and indicate under "subject " either the make of the vehicle or the words "parts order". This will keep it from being filtered out as spam.

    Payments - Payments are normally made by check, money order, COD, or through Paypal (www.paypal .com) Credit card payments are currently only accepted through Paypal. Payments made by Paypal should be made to the account under our email address: jparker3@twcny.rr.com

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