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Sprint cars are open-wheel race cars, designed primarily for the purpose of running on short oval or 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.
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 ...
Steve Kinser's 2007 World of Outlaws sprint car at the King's Royal race. The series is a national tour of high power to weight, custom fabricated sprint cars. The race cars feature large adjustable wings on the top and large rear tires that transfer their power to the dirt tracks they race on.
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 series consists of four driver classifications and five classes of vehicles: GT3, GT4 (Sprint, SprintX, East and West), and Touring Car, consisting of TCR homologated cars, as well as separate TC and TCA classes featuring modified production vehicles, such as the BMW M235iR and the Mazda MX-5 Cup car.
This means the rear of the car has a torsion bar system that is identical to the 4 bar set-up, while the front-end uses shocks with coil springs. Mini-sprints use a solid, live rear axle that is positioned in the chassis by a Jacobs Ladder or panhard bar. Unlike the midget or the sprint car, the final drive on a mini-sprint is a roller chain.
An Offenhauser midget engine, polished for display Offenhauser midget car engine - front view. Offenhauser produced engine blocks in several sizes. These blocks could be bored out or sleeved to vary the cylinder bore, and could be used with crankshafts of various strokes, resulting in a wide variety of engine displacements.
The private Broadspeed team headed by Ralph Broad did extensive development on the Sprint engine, bringing power up to a claimed 174 bhp (129.8 kW). Sprint-powered Broadspeed cars won the Manufacturer's Championship in 1974 and took the driver's title in 1975. In 1976 the cars took 2nd in the 2-litre class, and won again in 1978.