What is the difference between a Winston/Nextel Cup stock car and a Busch Series stock car?
by 
Santaanacanyon
ANSWERS: 7
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Several little things, but the one difference that counts is the carburetor in a Busch Series car is smaller. Everything else about the engines in the two series are the same. NASCAR wants technicians in Busch Series to be familiar with those engines before they move up to Winston Cup.
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The big difference in the setup of the cars is wheel base. Busch cars are shorter.
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They also use V6 engines in Busch Series and V8 in Nextel Cup
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they used to run v6s years ago but went back to v8s now
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Ok, both series use V-8 engines. The Busch series uses smaller carbs and intake manifolds to reduce the horsepower produced. There is about a 200HP difference in the two and the Busch cars weigh less than Cup cars.
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There a few differences. One is the wheelbase as mentioned earlier. Cup cars are 110", and Busch cars are 105". Another difference is the weight. Cup cars must be a minimum 3400 lbs without the driver, and Busch cars are 3300. The engines are similar, yet have a few differences. Busch series cars use 390 CFM carburetors, and Cup cars use 750-850 CFM. There used to be a huge difference in horsepower several years back, but Busch series motors now use a full roller camshaft and lifters. Cup engines are still using flat tappet lifters. Busch engines are around 9:1 compression, and Cup engines are 12.5:1. These differences (and a few minor others) equate to about a 100 horsepower difference, with the advantage given to the Cup motors.
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Busch cars have 105" wheelbase, While cup cars have a 110" wheelbase. Cup cars are 100 lbs heavier weighing a minimum of 3400 lbs dry, without driver. Cup cars have higher compression ratio and higher flow carbs and intake manifolds giving them 100-200 more Hp. Larger rear spoilers on Busch cars gives added downforce on the rear deck. Busch cars are limited to the number of sets of tires per race, adding tie pit strategy.
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