Single vs. dual - Saab Sonett Bulletin Board - Saabnet.com
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Single vs. dual
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Posted by baasaackwards (more from baasaackwards) on Sat, 8 Dec 2001 18:20:25 Share Post by Email
In Reply to: Re: Exhaust Information, Alex, Sat, 8 Dec 2001 10:42:14
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Duals may look better and in some ways BE better, but what you DON'T want to do is have a separate pipe running back from each exhaust flange with no crossover/balance pipe. The factory system used duals but had them joined by a crosspipe just below the front floor, same place the 96 has its 'dumbbell' front muffler/crossover. You really want to have the two banks interconnected because the way the firing pulses are staggered produces a scavenging effect that extracts the exhaust gas more efficiently. Same deal with the Y-collector system sold by MSS -- joining the pipes at a Y makes the whole system more efficient than two completely separate pipes, even if the separate pipes were larger.

Beyond a certain point, fitting larger pipes won't reduce back pressure any further anyway because the real constraint is upstream, at those #@!$ siamesed exhaust ports in the head... which is why the factory rally engines eventually had to go to dual-port heads.

posted by 24.3.2...

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