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<x-charset iso-8859-1>On Wednesday 14 November 2001 08:41, Scott Taylor wrote: > Andre wrote: > >>I can't find an explanation of the heat riser system in any of my > > books. Am > I right to assume that it is essentially a small exhaust tube that runs > alongside the intake manifold and empties into the main exhaust flow? > How > does the butterfly valve work... Closed when warm or closed when cool? > Is > it true that a plugged heat riser can cause hesitation and even engine > damage?<< > Type 1's had a heat riser, but no valve. They just had a smaller hole in one of the gaskets. It limited the amount of exhaust that could go through the riser pipe. Main problem was that the pipe would get plugged with carbon and crud. -- Russ Wolfe '71 Fastback AT '66 Fastback MT (IT RUNS) russw@classicvw.org http://www.classicvw.org ------------------------------------------------------------------- Unsubscribe? mailto:type3-request@vwtype3.org, Subject: unsubscribe </x-charset>