exhaust system idea

Greg Hermann bearbvd at sni.net
Sun Mar 14 22:37:33 GMT 1999


>Wasn't the original question about the concept of a variable back pressure
>exhaust system?  I think the idea is great, low to mid rpm gets more
>backpressure, then as rpm's increase, backpressure decreases to none.
>That's where the open pipe idea came from.
>
>If this idea were coupled with a variable valve timing setup, it would allow
>the best performance through all rpm ranges.  Of course, it's all shooting
>from the hip theories!

Your exhaust back pressure will vary with the square of the mass flow in
the exhaust system anyway-- so at, say 2500 rpm, WOT, you will only have
maybe 30% of the backpressure you would see at WOT 5000 rpm with a regular
system.

Greg
>
>Jim Yeagley
>1996 Dodge Indy Ram
>See it and many others at: www.indyram.org
>1975 Pontiac Grandville Brougham Conv. (in baskets)
>webmaster at indyram.org
>jimyeagley at stratos.net





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