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Mark Martin won the race, only to lose 46 championship points after NASCAR officials discovered a somewhat oversized carburetor spacer plate in his car. This ultimately became a key factor in determining the 1990 championship. It was admitted later that the spacer plate was actually not oversized and not technically illegal.
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 ...
A 46-point penalty at Richmond, for using an illegal (but non-performance-enhancing) carburetor spacer, caused him to lose to Dale Earnhardt by 26 points in the final standings. During this time, Martin also won five IROC titles (1994, 1996, 1997, 1998, and 2005) and 13 races, both records for that series.
The last race with the original restrictor plates was the 2019 Daytona 500; after that race, the cars moved to a variable-sized tapered spacer already used at all other tracks, with the exception that the spacer would have smaller holes than the ones used at the smaller tracks, to ensure speeds stay under 200 MPH. The shape of the spacer helps ...
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.
With a single four-barrel carburetor they weighed 680 lb (308 kg) [26] and were rated at 616 horsepower (459 kW) at 7,000 rpm and 515 lb⋅ft (698 N⋅m) of torque at 3,800 rpm, with dual four-barrel carburetors 657 horsepower (490 kW) at 7,500 rpm and 575 lb⋅ft (780 N⋅m) of torque at 4,200 rpm. Ford sold them via the parts counter, the ...
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