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I can't answer all of your questions, but I think I can answer a couple. The small heat exchangers connecting the muffler to the heads for cylinders 2 & 4 (back cylinders) aren't used on most "header" type exhaust systems. They're pretty much window dressing. However, the connecting hoses from those to the fan housing are quite important, and aren't used for monitoring engine temp. You'll note that those hoses go from the fan housing to the small HEs and another set of hoses go from the small HEs to the big HEs. That's how the air gets propelled out of the HE and into the car. At least on the early cars, there is no other blower fan for heated air. The only way to get air blown into the car is from the engine cooling fan. You may have already noticed that a misty windscreen clears more quickly at higher revs. This is why. On aftermarket systems that delete these small HEs, you use longer hoses to directly connect the fan housing to the big HEs. --- David Sanderson <porschedave@rennlist.net> wrote: > Hi All > > I am looking at this stock exhaust system and > wondering how much I > need to keep. Specifically, there are two small heat > exchangers that > link the rear exhaust to the muffler. These are > shown on Dave Hall's > site > <http://www.hallvw.clara.co.uk/type3/T3pbo/T3pb2-12.htm > > as > number 8 and 9. There appears to be a washer of some > sort that fills > the gap and ensures that the exhaust actually makes > it into the > muffler. Also, coming off these is an outlet that > ties to the fan > housing. I gather than this has something to do with > monitoring > engine temperature. > > On mine, the fitting of these exchangers to the > muffler is very loose > and floppy. I have managed to get one off but cannot > get the other > off. > > So, those of you not running a stock muffler system > what do you do > with this component? and ho do you route air into > the fan shroud? > > For those of you running a stock system, how did you > separate these > components so that the washer can be replaced? > Anyone know where we > might find a set of those in good condition? > > Dave > -- > David Sanderson > (604) 822 - 4361 or (604) 255 - 4935 voice > (604) 822 - 6842 fax > porschedave@rennlist.net > 1977 911S 3.0 L > 1965 Sunroof Notch > 1966 Notch > http://members.rennlist.com/porschedave/ > http://www3.telus.net/SUDAMA > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > List info at http://www.vwtype3.org/list | > mailto:gregm@vwtype3.org > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > __________________________________ Do you Yahoo!? Yahoo! Mail - now with 250MB free storage. Learn more. http://info.mail.yahoo.com/mail_250