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The restrictor plate limits air into the engine, reducing horsepower and speed at these tracks from 230-240 mph to 195-200 mph. At these races, in addition to the restrictor plate, there are a variety of other technical rules and regulations to keep the cars stable and on the track.
The restrictor plate limits air into the engine, reducing horsepower and speed at these tracks from 230-240 mph to 195-200 mph. At these races, in addition to the restrictor plate, there are a variety of other technical rules and regulations to keep the cars stable and on the track.
Artist rendering of a NASCAR restrictor plate. A restrictor plate or air restrictor is a device installed at the intake of an engine to limit its power. This kind of system is occasionally used in road vehicles (e.g., motorcycles) for insurance purposes, but mainly in automobile racing, to limit top speed to provide equal level of competition, and to lower costs; insurance purposes have also ...
This is the largest carburetor restrictor plate opening since the one inch (25.400 mm) mandate in 1988, the first year the horsepower-reducing plates were used in the Cup Series at Daytona. [18] Unfortunately, the restrictor plates have an unintended effect on the race. Because of the reduced horsepower of the cars, the cars form large packs.
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The throttling down of horsepower at NASCAR’s sister superspeedways — Talladega and Daytona — began in 1988 as a way to slow the cars to just moderately insane speeds. Fifteen laps into the ...
As NASCAR is choking down horsepower on cars throughout the Cup Series through tapered spacers in 2019, the series doesn't need to use plates at Daytona and Talladega any longer. 2019 Daytona 500 ...
It experimented with restrictor plates for the first time at Michigan in August 1970. [24] At the beginning of the 1971 season, NASCAR limited an engine's cubic inch displacement. [21] The reductions had the effect of reducing costs for teams, but also limiting the horsepower and top speeds of NASCAR teams. [22]