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The 2011 Sprint Cup season was the last complete Cup season with carbureted engines; at the end of the 2011 season, NASCAR announced that it would change to an electronic fuel injection system for the 2012 racing season. [24] NXS cars do, however, continue to use carburetors. However, modern technology has allowed power outputs near 900 ...
Each team may build its own cars and engines (per NASCAR's specifications) or purchase cars and engines from other teams. The cars are powered by EFI V8 engines since 2012 after 62 years using carburetion as engine fuel feed with compacted graphite iron blocks and pushrod valvetrains actuating two-valves per cylinder, and are limited to 358 ...
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).
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.
In the first 23 races of the 2022 season, drivers in the Cup Series scored a total of 151 DNFs - an increase by 56.6% compared to the 2021 season. [ 121 ] Denny Hamlin has called for NASCAR to redesign the Next Gen from scratch, as he believed there was no feasible way to solve the safety issues of the car's current iteration. [ 122 ]
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.
NASCAR Sprint Cup races can start in temperatures as low as 50 °F (10 °C) without making the vehicles suffer through major engine problems. [16] One of the downsides of allowing 15% ethanol fuel is the big jump in corn prices in recent years. [17]
Cup Series cars would run a new aero package at all road courses and tracks measuring one mile or shorter (except Bristol Motor Speedway and Dover Motor Speedway). The package would consist of a three-inch spoiler, a simplified diffuser and diffuser strakes, the 2023-spec short track/road course splitter stuffers, and no engine panel strakes. [152]