Quote:
Originally Posted by abogart
Instead, one would want to simply reduce the tailpipe diameter. OR, perhaps a flapper or check valve with a fixed spring pressure which could effectively allow only enough open area to permit exhaust to flow out at a set velocity over a broad range of engine speeds.
Just my thinking out loud here, I might be totally wrong.  |
Back in the old days I saw some cars with a butterfly valve in the collector of the exhaust manifold. It had a thermal spring so it would open when it was warmed up. This was on V engines and on one side only. It may have had been a way to warm up the engine sooner. This was before ERGs.