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NASCAR engine bay. 1987 Ford Thunderbird stock car engine. ... The restrictor plate limits air into the engine, reducing horsepower and speed at these tracks from 230 ...
Cup Series teams are restricted in the number of engines they may use in a season (16 engines at minimum must last at least two race weekends), effectively a limit of 20 engines during the season. Changing either will result in starting in the rear of the field.
In addition, Toyota examined the engines of Kyle Busch and Martin Truex Jr. after their cars experienced engine failures during the race. [113] At the 2022 Autotrader EchoPark Automotive 500 at Texas, Cody Ware survived a hard crash, colliding with the turn 4 wall before violently hitting the pit wall. [ 114 ]
In 1982, NASCAR's then-new second-tier series (currently known as the NASCAR Xfinity Series) competitors began looking at alternatives from the 5-litre based (311 cu in (5.1 L) engines, as in short track racing there was a push for six-cylinder engines to save on costs, with some series allowing weight breaks.
NASCAR's rules implemented for the 1971 season limited the "aero-cars" to an engine displacement of no greater than 305 cu in (5.00 L) or they had to carry much more weight compared to their competitors. While they were still legal to race, the power-to-weight consequences that would come with the smaller engine or the increased weight rendered ...
When the series first started, the cars ran a V6 engine with a maximum 274 cu in (4,490 cm 3) displacement and no compression limit. In the early/mid 1990s the V8 engine with a 9.5:1 compression and maximum 358 cu in (5,870 cm 3 ) displacement was introduced to the series as an alternative to the V6 engines.
Pearson took advantage of the NASCAR engine and weight rules for 1968 and used a 396 cid engine instead of the normal 427. At that time the car had to be 4,000 pounds with the 427 cid engine but only 3,707 pounds with the 396 cid engine. The lighter weight paid off as Pearson used less fuel and had fewer tire troubles than many of the other teams.
NASCAR eventually adopted a restrictor plate to limit top speeds for the 7.0L engine as teams switched to small-block 358 cu in (5.9 L) engines. NASCAR edited the rules in a way that they hoped would make the cars safer and more equal, so the race series would be more a test of the drivers, rather than a test of car technology. [21]