Restrictor Plate

An aluminum plate designed to reduce the flow of air and fuel into the engine's combustion chamber. This decreases the horsepower and speed of the car and is used on certain NASCAR race tracks to make the races safer (hopefully). It has the negative in that all the cars tend to run the same speed and they tend to bunch up causing massive wrecks in some cases.

A thin metal plate with four holes that restrict airflow from the carburetor into the engine. Used to reduce horsepower and keep speeds down. The restrictor plates are currently used at Daytona International Speedway and Talladega Superspeedway, the two biggest and fastest tracks in NASCAR.