![]() Either by measuring everything making sure nothing is off, or by making sure any combination of parts would be within acceptable tolerances. Ofcourse, 0.010 variation on each part would be alot today, but nevertheless, there IS some variation, and in one way or another it has to be taken into account when the engine is assembled. On the other hand, you would also have to accept that the worst combination of parts on the other end of the scale would give 0.120" quench. If 0.040" is the minimum safe quench number and you build a engine of parts where deck height, conrod length, piston height and gasket thickness each can vary 0.010" up or down you'd have to aim for 0.080" so no engine, even with the worst possible combination of parts go under 0.040. If this is an open engine car, that's even better.Ĭlick to expand.The engineers might have deserved the credit for their ideal design, but then the whole thing has to be adapted to manufcturing and the production tolerances that comes with it. Just make sure of your cooling system and run 93 octane gas. I still think you are safe at this ratio. I just reran your numbers using 4.030 bore. Google Wallace Racing Calculators to input your exact numbers. Using the Wallace racing calculator for compression ratio for your motor, I assumed 4.00 bore, 3.25 stroke, 4.5cc reliefs. Good quench will help eliminate detonation with higher compression. With a tight quench and 93 gas, I would think you could get away with 10:1 pretty easy with the Vortec heads. That being said I run 11.3:1 w/alum heads on 93. The current thinking is 9.5:1 for iron heads and 10.5 for aluminum heads. Smoothing out the combustion chamber so there are no sharp points to heat up and cause detonation is of utmost importance when running higher compression ratios. ![]()
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