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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 ...
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 first win of a restrictor plate race during the fuel injection era would go to Matt Kenseth. [20] However, Kenseth simply could not keep the consistency to win any other restrictor plate race during the current fuel injection era. Roger Penske would become the first person to win the owner's championship while fielding cars with fuel injection.
During the 2007 UAW-Ford 500, the CoT's debut on a superspeedway track at Talladega, NASCAR assigned a 31 ⁄ 32 inch (25 mm) restrictor plate to allow the engines to run at around 8,800 RPM due to the less aerodynamic design of the CoT. The previous generation car's engine would normally run around 7,000 RPM with a 7 ⁄ 8 inch (22 mm) plate. [36]
Orifice plate showing vena contracta. An orifice plate is a thin plate with a hole in it, which is usually placed in a pipe. When a fluid (whether liquid or gaseous) passes through the orifice, its pressure builds up slightly upstream of the orifice [1] but as the fluid is forced to converge to pass through the hole, the velocity increases and the fluid pressure decreases.
An exploded-view drawing is a diagram, picture, schematic or technical drawing of an object, that shows the relationship or order of assembly of various parts. [1]It shows the components of an object slightly separated by distance, or suspended in surrounding space in the case of a three-dimensional exploded diagram.
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.
All vehicles are powered by a 14 hp Kohler Command Pro CH440 engine with a modified restrictor plate label for competition testing. Kohler and SAE International entered an agreement where Kohler will provide engines at discount to participating teams for the 2023–2026 competition seasons.