Quote:
Originally posted by Cue-Ball
Most car manufacturers make the inlet to the intake larger than it is at the point it enters the throttle body/carburetor. The reason for this is that it speeds up the air going into the engine. A large amount of air enters the intake and as it gets smaller the air has nowhere to go but into the engine. In order to fit the same amount of air in a smaller space, it has to speed up. This venturi effect increases horsepower.
...or something like that. 
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Actually, the opposite of that. When it goes from larger to smaller, the air slows down.
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George Roffe
Houston, Texas USA
00 328i
91 SE-R (well modded)
84 944 SCCA ITS race car under construction
"I fear all we have done is to awaken a sleeping giant and filled him with a great resolve"
-- Admiral Yamamoto, December 7, 1941
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