The Proform Race Series 4bbl carburetors feature several improvements and 18 new models for 2022. With a line ranging from 650 cfm to 1,050 cfm, new models include ones designed for E85 and alcohol fuels, circle-track applications, and versions with double-stepped annular boosters for increased fuel atomization.
The entire Race Series line features redesigned main bodies, throttle base plates, metering blocks, and fuel bowls. All weigh less than 8 lb.
The carburetors now include a high-flow main body. The Venturi area has a contoured leading edge to provide smooth, inbound airflow to the main body.
A billet throttle base plate has slabbed throttle shafts, with low-profile screws, to decrease air resistance into the Venturis, resulting in better combustion efficiency. It also mates better with the intake manifold flange due to an enlarged surface area that has more strength and rigidity than previous versions. The base plate offers multiple ports for accessories and gauges.
Increased baffling between the fuel bowl float and the metering block interfaces reduces fuel slog. A retaining vent baffling whistle tube improves fuel retention. The billet metering block features multiple, tunable, predrilled emulsion channels to control air transfer to the main well to adjust the air and fuel mixture.
More internal baffling in the center-hung, aluminum fuel bowl controls internal slosh. It keeps fuel in the lowest area of the bowl during acceleration and cornering. The lower fuel ramp reduces fuel turbulence and bubbles.
Proform Race Series Carburetors also come in a deep-black finish. It not only offers better corrosion and impact resistance, it also reduces fuel temperatures by 6% over polished finishes (about 10°F).
Source
Proform Parts
Warren, Michigan
586-774-2500
proformparts.com
Outside Groove Note of Transparency: Specialty Auto Parts, U.S.A., Inc. paid for the production of this article. The content was subject to approval of Specialty Auto Parts, U.S.A.
Mike Adaskaveg has written hundreds of stories since the website’s inception. This year marks his 54th year of covering auto racing. Adaskaveg got his start working for track photographer Lloyd Burnham at Connecticut’s Stafford Motor Speedway in 1970. Since then, he’s been a columnist, writer, and photographer, in racing and in mainstream media, for several outlets, including the Journal Inquirer, Boston Herald, Stock Car Racing, and Speedway Illustrated. Among Adaskaveg’s many awards are the 1992 Eastern Motorsport Press Association (EMPA) Ace Lane Photographer of the Year and the 2019 National Motorsports Press Association (NMPA) George Cunningham Writer of the Year.
