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Regular events include 410 cubic inch sprint cars, 305 cubic inch sprint cars, and dirt trucks. In 2024, the World of Outlaws sprint car series returns to the speedway for the first time since 2016. The speedway has previously hosted the All Star Circuit of Champions, National Sprint Tour, and United States Auto Club.
The first weekly races were held at the Knoxville Raceway in 1954. After internal issues with the sanctioning body—the Southern Iowa Stock Car Racing Association—in 1956, Marion Robinson of Des Moines, Iowa was appointed as race promoter. During Robinson's tenure, the cars progressed from stock cars to modifieds to supermodifieds to sprint ...
Sprint cars are open-wheel race cars, designed primarily for the purpose of running on short oval, circular dirt or paved tracks. Historically known simply as "big cars," distinguishing them from "midget cars," sprint car racing is popular primarily in the United States and Canada, as well as in Australia, New Zealand, and South Africa.
POWRi (Performance Open Wheeled Racing, inc.) is a dirt track racing sanctioning body based in the United States, founded by promoter Kenny Brown. [1] [2]It organizes the POWRi National Midget Series, a midget car racing series rival to the USAC National Midget Series, as well as the POWRi West Midget Series and POWRi Outlaw Midget Series feeder series.
However, certain engine sizes were common, and could be considered the "standard" Offenhauser engines: [7] 97 cu in (1.59 L) - to meet the displacement rule in many midget series; 220 cu in (3.6 L) - displacement rule in AAA (later USAC) sprint cars; 270 cu in (4.4 L) - displacement rule for the Indianapolis 500 under AAA rules [11]
Sprint Cars are powered by a naturally-aspirated, methanol-injected overhead valve V-8 engines; with a displacement of 410 cubic inches (6.7L) and capable of engine speeds approaching 9000 rpm. [3] A lower-budget and very popular class of sprint cars uses 360-cubic-inch (5.9L) engines that produce approximately 700 horsepower (520 kW). [4] [5 ...
Like sprint cars, supermodifieds do not have starters, batteries, or transmissions, and are push-started. The combination of high power, light weight, and high cornering ability allows supermodifieds to average over 120 mph (190 km/h) on a 1/2-mile oval and 150 mph (240 km/h) on a 1-mile (1.6 km) oval, with top speeds over 190 mph (310 km/h).
The class most resembling the North American form of stock car racing are known as Saloon cars. Super Saloons are similar to dirt late models with the main differences being the bodies closer resemble production cars, use iron engines up to 7.1 litres (434 cu in) with no rear offset and run much larger sprint car tyres on the rear.