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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 (including the driver)〔http://www.williamsgrove.com/divisions.htm〕 for a 410 Sprint car, power outputs of to are commonplace for these machines, which is around 140-340 more horsepower than a Formula One engine. Typically they are powered by a naturally aspirated American V8 with an engine displacement of 410 cubic inches (6.7L) capable of engine speeds of 9000 rpm.〔http://www.williamsgrove.com/divisions.htm〕〔(【引用サイトリンク】title=Sprint Car Specs )〕 Depending on the mechanical setup (engine, transmission) and the track layout these cars achieve speeds in excess of 160 mph.〔http://www.williamsgrove.com/divisions.htm〕 A lower budget but likewise very popular class of Sprint cars uses a 360 cubic inch (5.9L) engines that produce approximately . 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, and Al Unser, Jr., as well as NASCAR Sprint Cup champions Jeff Gordon and Tony Stewart. The National Sprint Car Hall of Fame & Museum located in Knoxville, Iowa, USA features exhibits to highlight the history of both winged and non-wing sprint cars. ==Non-winged sprint cars== There are a few sanctioning bodies for non-winged sprint cars. The United States Automobile Club (USAC) has become the premier series for non-winged sprint car racing throughout the United States, especially after taking over the Sprint Car Racing Association (SCRA) and turning it into the USAC/California Racing Association (USAC/CRA). This series has become the premier non-winged sprint car series on the west coast of the United States. USAC also has hosted the Silver Crown series based in the Midwestern United States state of Indiana for decades. The Silver Crown series was started in 1971 as an offshoot of the series that competed for the National Championship Trail including the Indianapolis 500, known as "big cars".〔(SAC Silver Crown specs and history )〕 Australia also has non-winged divisions which include 360 non-winged sprint cars, which are raced mainly in the South and West Coast. Wingless sprints, or sometime referred to as nose sprints, have also become quite popular in Australia. Wingless sprints are powered by a 6-cylinder Holden engine which can develop around , as well as reach speeds up to . Wingless sprints have entirely the same chassis as a normal Sprintcar, just without the front and top wings. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sprint car racing」の詳細全文を読む スポンサード リンク
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