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if im not mistaken, and i frequently am, when building one's self a bad ass motor(one that you put alot of time into) don't you find top dead center(with the heads off) by setting up a stop in the cylender, marking on your degreed pully where the piston contacts it, rotating untill the piston hits it again, marking that, and dividing between the two marks. that would be EXACT top dead center. On 23 Sep 98, at 15:33, oofacts@earthlink.net wrote: > So is this pencil trick for verifying TDC correct? It makes sense; it all > adds up. But I thought that TDC wasn't EXACTLY TDC - that it was a little > before True TDC (kind of like magnetic north) . Thats what seems to be > implied in Muir in the Performance section of the book. Any comments? > Someone learn me straight on this. There is only one TDC and that is EXACTLY TDC. Jim - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe