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>On 4 Mar 98 at 6:09, John R. Jetty wrote: > >> has any one ever polished the inside of there manifold??? I want to try to >> clean it up and seeing as I am just waiting on my Bankruptcy to get >> finished ( singing the paper work Thursday being filed Friday ). >> The inside of the manifold is s rough I think it would help immensely but >> how do I do it ????? > >I have heard that a rough intake manifold promotes turbulence which >is a good thing. It helps the fuel/air mixture to mix more >thoroughly. It is still a good idea to take the sharp corners off >the bends and do other things which promote better breathing. > >The exhaust manifold is a good thing to polish as this minimizes heat >loss to the walls. > >Jim "...a rough intake manifold promotes turbulence which >is a good thing. " I'm not so sure about this. If this is so then why do racers want the intakes, valves, and even the interior throats of carbs polished??? Air volume at a higher rate! Rough pipes decrease the flow velocity of the air which makes the engine starve for fuel mixture right? I can see the "rough causes mixture" in theory, but if this is so, wouldn't VW have added a texture to the pipe? And for polishing the exhaust manifold... Where? Do you mean the interior of the heater boxes? I am unclear as to the location you mean. Big Al ================================= "The rarest-of-the-rare Volkswagens" Type 3 Cabriolet Prototype Project http://www.autographica.com/t3cpp.html mailto:awpresley@autographica.com =================================