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Nitromethane, or "nitro", is a high-performance racing fuel; Acetone is a vaporization additive, mainly used with methanol racing fuel; Butyl rubber (as polyisobutylene succinimide, detergent to prevent fouling of diesel fuel injectors) Ferrous picrate, used in diesel fuel to increase fuel conversion efficiency and reduce emissions
Dirt track racing is a form of motorsport held on clay or dirt surfaced banked oval racetracks. Dirt track racing started in the United States before World War I and became widespread during the 1920s and 1930s using both automobiles and motorcycles, spreading throughout Japan and often running on horse racing tracks.
In the beginning of dirt track racing small numbers of cars would gather at a horse racing oval. [2] [page needed] The first dirt race was held in 1876 in Cranston, Rhode Island and was made up of 8 vehicles, most who were gasoline powered, however the victor was a man named Whiting who had an electric powered vehicle. [2]
The existing USAC National Championship was a mixture of road courses, hill climbs and paved or dirt oval races. For the 1971 season this championship switched exclusively to paved ovals. Especially on the paved ovals rear-engined cars dominated the races whereas on the dirt ovals the front-engined cars were superior.
Use of leaded gasoline in NASCAR; Nitromethane and methanol fuel, used by Top Fuel drag racing; Methanol fuel, formerly used in some open-wheel race cars, like IndyCar Series prior to 2007 and in Top Alcohol drag racing; Ethanol fuel, now being used in the IndyCar Series and NASCAR; Nitrous, used by drag racing vehicles to increase horsepower
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The Illinois State Fair mile currently hosts the Allen Crowe Memorial 100 ARCA stock car race, USAC Silver Crown dirt cars, UMP Late Models and Modifieds and the A.M.A. Grand National Championship. The only driver who has won races in three disciplines of racing in Ken Schrader who won in ARCA cars (1998), UMP Modifieds (1998), and midgets.
Dirt track racing is the single most common form of auto racing in the United States. According to the National Speedway Directory, there are over 700 dirt oval tracks in operation in the US. [1] The composition of the dirt on tracks has an effect on the amount of grip available. Many tracks use clay with a specific mixture of dirt.