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In 1989, NASCAR changed rules requiring cars to use current body styles, similar to the Cup cars. However, the cars still used V6 engines. The cars gradually became similar to Cup cars. 1994 was the final year that V6 engines were used in the Busch Series, as many short track series had abandoned six-cylinder engines. In 1995, changes were made.
“In this instance, prior to presenting the engine to NASCAR for inspection, Toyota Racing Development disassembled and rebuilt the No. 11’s Bristol-winning race engine.
Further, there are random races per year where NASCAR confiscates vehicles (including engines and chassis) and takes them to NASCAR's Research and Development Center for evaluation, comparison, and to help decide on future rule changes, or Balance of Performance changes (NASCAR's center is also used for IMSA and ACCUS/FIA evaluation of BoP).
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.
A notable addition to the Next Gen is the rear diffuser, which is set to be used in NASCAR for the first time. NASCAR has conducted various tests on the wind tunnel to have the car to generate more downforce using the rear diffuser. Adjustable aerodynamic components are also being used to accommodate the various track types in the schedule. [76 ...
At racing speeds approaching 200 miles per hour, a modern NASCAR race car can generate enough lift to get airborne if it spins sideways. To keep cars firmly planted, roof flaps were required in 1994. [3] 1994 was also the final year that V6 engines were used in the Busch Series, as many short track series had abandoned six-cylinder engines.
Different car make/engine combinations are considered to be different manufacturers for the purposes of the Championship. Up to the 2013 season, the Manufacturer's Championship points were calculated by adding points scored in each race by the highest finishing driver for that manufacturer.
The hefty penalty was handed down because Hamlin’s race-winning engine from Bristol Motor Speedway in March was rebuilt by manufacturer Toyota before NASCAR could tear it down and inspect it.