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I read this a couple weeks ago off of stranoparts.com.
Quoted from Sam Strano:
"Back pressure doesn't help torque. Those who say that either don't know better, or simply misunderstand scavaging effects.
You want a system that offers low to no restriction to the amount of air the engine can pump. However,if you have too big a pipe for example this will hurt you because it won't "pull" the air properly. A Honda with a 3" pipe would be worse than a Honda with a stock 1 7/8" or 2" pipe because there simply isn't enough exhaust to fill the piping. The exhaust slows when it expands and cools. Both of which hurt power. But a well designed say, 2.25" pipe can give you best of both worlds. Good scavaging effect without a high RPM restiction.
If you think of air like you do water, it may help picture it. A little water in a big hose has no restriction, but also just dribbles out. A little water in a really small hose comes out with a lot of pressure, but no volume. We have to find the middle ground. "
Quoted from Sam Strano:
"Back pressure doesn't help torque. Those who say that either don't know better, or simply misunderstand scavaging effects.
You want a system that offers low to no restriction to the amount of air the engine can pump. However,if you have too big a pipe for example this will hurt you because it won't "pull" the air properly. A Honda with a 3" pipe would be worse than a Honda with a stock 1 7/8" or 2" pipe because there simply isn't enough exhaust to fill the piping. The exhaust slows when it expands and cools. Both of which hurt power. But a well designed say, 2.25" pipe can give you best of both worlds. Good scavaging effect without a high RPM restiction.
If you think of air like you do water, it may help picture it. A little water in a big hose has no restriction, but also just dribbles out. A little water in a really small hose comes out with a lot of pressure, but no volume. We have to find the middle ground. "
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