We then removed the SUs, and installed a pair of 42 mm HSR Mikunis. In 2012 we dyno tested a stock MGB with SU carbs. While doing the testing, we developed a new emulsion tube system for the Mikunis. The Mikunis were the clear winner in power, throttle response and fuel economy. Quad 45 Mikunis on the left vs Weber 50 DCO race carbs on a 2.5 L Volvo B20. The result - the Mikunis were the clear winner. 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. 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.
![1959 triumph tr3a carburetor 1959 triumph tr3a carburetor](https://sportandspecialty.com/wp-content/uploads/2016/10/1959Triumph-TR3-G-8.jpg)
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. Over the winter of 2010/11 we did a comparison of our Quad 45mm Mikuni HSR carbs vs sidedraft Webers. 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. Other carbs still have their place - where an original equipment look is required for shows or to meet competiton rules.
#1959 triumph tr3a carburetor series
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. Test criteria included cost, power, throttle response, fuel economy, ease of installation and tuning. The testing included both stock and modified versions of the carbs. 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 result was a year of searching and testing that lead to the conclusion that the Mikuni HSR carbs were clearly the best option.ĭuring that year of testing numerous carbs were evaluated both on the street and the dyno. In 2003 we needed improvements to the typical SU and Weber carb setups for use on our Volvo performance and supercharged engines. See the new photos and more customer comments at the end of the Mikuni Carb Section below and the photo article on installing the Dual Kit in an MGB. " And after a recent installation by a UK TR3 owner - "The car runs like a dream, it accelerates like a scolded cat and has bags of low end torque. This car runs like it just grew another cylinder.
#1959 triumph tr3a carburetor install
And from a US TR6 customer, " Just finished the install on the mikuni’s and damn, what a difference. to say it goes better would be something of an understatement." that's the comment from a customer in Scotland who recently installed our dual Mikuni carb kit to replace SU carbs on a Volvo Amazon. Stromberg carbs will show significant improvements in all aspects of performance by simply changing to the Mikuni HSR carbs. We still use DCOE Webers for vintage and historic racing, but any car that came with SU or Z. Our Mikuni Carb Kits have changed Everything!!
![1959 triumph tr3a carburetor 1959 triumph tr3a carburetor](https://www.motorclassiccorp.com/imagetag/79/8/l/Used-1956-Triumph-TR3-1618519959.jpg)
Flywheels - Aluminum - Lightened Stockįorget what you thought you knew about the best carbs for vintage cars.
![1959 triumph tr3a carburetor 1959 triumph tr3a carburetor](https://bringatrailer.com/wp-content/uploads/2020/09/1959_triumph_tr3a_16038072957822495IMGP1190.jpeg)