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On 12 Sep 2002, at 8:10, Shad Laws wrote: > > KeithP=> What were your problems with your T4's?? > > > > The head design is weak, > Absolutely false. It uses a cross-flow design, which is superior. I don't understand "cross-flow design." What does this mean? > The factory used cheap sintered metal seats. On the larger-valved T4 > engine, this bit them in the butt. First part of the solution: don't > use them :-). We use machined metal seats. To my knowledge the seats aren't the problem; they don't come apart, or do they? I would expect sintered seats to have the same expansion properties as solid. There are a lot of really good parts made by sintering, although I have no idea if these were "good" or not. > And, we install them with a good interference fit. This is all common > knowledge, and it works. This may be the WHOLE solution. Does greater interference make these heads more prone to cracking? It certainly puts more tension stress on the aluminum. - Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/