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On 21 Jun 99, at 7:20, Erkson, Toby wrote: > First, let's be aware of terminology. An "extractor exhaust" means the > tubing that routes the exhaust gasses to the muffler. The distance the > exhaust gas pulses have to travel is all the same length (heat exchanger > distance is included). The ends of the tubing all meet at one spot and > that's where the muffler attaches. > > An extractor helps to draw in more of the air/fuel mixture. I fail to see > how it can induce a lean mixture. The vacuum extracts the exhaust more > efficiently and thus pulls in a greater intake charge. This is discussed at length in the Bill Fisher book. I really can't give you a good reason why, but every source that I have seen mentions that better exhaust scavenging will require re-jetting the carbs a notch or two richer. > Nonetheless, none of the current after-market muffler systems I'm aware of > will reduce the life of an engine. I have never, ever, heard of an > extractor exhaust. Now I'm confused. That is what everyone refers to them as, and you used that exact term in your first paragraph. I'm thinking that you left out a couple of words here.... Jim - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Unsubscribe? mailto:type3-request@vwtype3.org, Subject: unsubscribe