Re: Back Pressure - Saab 900 Bulletin Board - Saabnet.com
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Re: Back Pressure
Posted by RayF (more from RayF) on Mon, 7 Feb 2005 15:56:55
In Reply to: Not true, whitesaab, Mon, 7 Feb 2005 15:35:19
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And that is if anything as true of too little back pressure (larger bore, free flow, less restrictive, straight pipes) as it is of too much. Back pressure holds the charge in the cylinder so it can be there to explode. Backfiring, and explosions that you hear, indicate fuel that isn't doing its job. Truly tuned exhaust is a very difficult thing to achieve, done more by experiment than theory and involving differing lengths of header tubing from each cylinder coming together such that the exhaust pulses don't set up standing waves that restrict the flow.
Before fuel injection that was true of intake manifolds and intake air stacks as well, but a book I once read ("The Sports Car: Its Theory and Design" as I remember) recounted the curious fact that the stock factory cast iron "log" intake manifold on an American Motors 6 cylinder of the 1960s, straight, simple and ugly as sin, exhibited near-perfect characteristics, compared with fancy attempts at tuned intakes that had not very good results.
From which I infer, also possibly true with expensive aftermarket exhausts for all and sundry makes.
posted by 64.222.210...
Posts in this Thread:
- Non turbo muffler system in turbo??????, Tino, Mon, 7 Feb 2005 06:22:05
- If I were you..., JordanP, Mon, 7 Feb 2005 10:03:54
- Not true, whitesaab, Mon, 7 Feb 2005 15:35:19
- Different pipe diameter - won't 'connect' . n/m, BobD, Mon, 7 Feb 2005 08:12:55
- Re: Non turbo muffler system in turbo??????, 900 Aero (Group 9), Mon, 7 Feb 2005 07:29:01
- Bad Idea, Hank, Mon, 7 Feb 2005 07:36:02
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