Sprint car

Sprint cars are high-powered race cars designed primarily for the purpose of running on short oval or circular dirt or paved tracks. Sprint car racing is popular in the United States, Canada, Australia, New Zealand, and South Africa.

Sprint cars have a very high power-to-weight ratio, at a weight of approximately 1,400 pounds (640 kg) (including the driver) for a 410 Sprint car, power outputs of over 900 horsepower (670 kW) are commonplace for these machines, which is around 140-340 more horsepower than a 2014 Formula One engine. Typically they are powered by a naturally aspirated, mechanically fuel injected (methanol) American V8 with an engine displacement of 410 cubic inches (6.7L) capable of engine speeds of 9000 rpm. Depending on the mechanical setup (engine, gearing, shocks, etc.) and the track layout these cars achieve speeds in excess of 160 mph. A lower budget but likewise very popular class of Sprint cars uses a 360 cubic inch (5.9L) engines that produce approximately 700 horsepower (520 kW). Sprint cars do not utilize a transmission, they have an in or out gear box and quick change rear differentials for occasional gearing changes. As a result, they do not have electric starters (or even electrical systems other than magneto / ignition) and require a push to start them. The safety record of sprint car racing in recent years has been greatly improved by the use of roll cages, and especially on dirt tracks, wings, to protect the drivers. Many IndyCar Series and NASCAR drivers used sprint car racing as an intermediate stepping stone on their way to more high-profile divisions, including Indianapolis 500 winners A.J. Foyt, Mario Andretti, Johnny Rutherford, Parnelli Jones, Johnnie Parsons, Al Unser, Sr., and Al Unser, Jr., as well as NASCAR Sprint Cup champions Jeff Gordon and Tony Stewart. In fact, having recently announced his retirement from NASCAR, Tony Stewart plans on returning to Sprint Car racing. It has always been his true passion, according to Stewart.

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