While many series have adopted rules that tightly define virtually every component and dimension in a racing engine, the USAC National Midget Series offers engine designers the freedom to innovate. The innovative design of the new Chevy Midget racing engine is the product of imaginative thinking and advanced technology. The USAC Midget rulebook embraces a wide range of engines that includes four- and six-cylinder powerplants, two-valve and four-valve cylinder heads, and overhead-valve, single overhead cam, and dual overhead cam valvetrain designs. However, the Chevy Midget racing engine puts a new twist on a familiar theme. The opportunity to design an all-new Chevy Midget racing engine was an invitation for some of our best and brightest engineers to create an engine within the USAC guidelines that would be competitive in both performance and cost with existing engines. In accordance with USAC rules, the Chevy Midget racing engine displaces a maximum of cubic inches and burns methanol fuel.
GM Chevy Midget engine – More than half a V8
Midget car racing - Wikipedia
Sprint cars are high-powered race cars designed primarily for the purpose of running on short oval or circular dirt or paved tracks. Sprint cars have very high power-to-weight ratios , with weights of approximately 1, pounds kg including the driver  and power outputs of over horsepower kW ,  which give them a power-to-weight ratio besting that of contemporary F1 cars. Sprint cars do not utilize a transmission but have an in-or-out gearbox and quick-change rear differentials for occasional gearing changes. As a result, they do not have electric starters or even electrical systems other than a ignition magneto and require a push to be started. 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, which increase surface traction, to protect the drivers.
Sprint car racing
Midget cars , also speedcars in Australia , is a class of racing cars. The cars are very small with a very high power-to-weight ratio and typically use four cylinder engines. They originated in the United States in the s and are raced on most continents.
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