This additional timing then contributes to While a larger chamber will reduce staticĬompression, a poor chamber shape will require more ignition timing to properlyīurn the air/fuel mixture. Chamber shape and volume have a bigĮffect on combustion efficiency. This iron head uses a nice, compact 64cc combustion chamber that benefitsįrom the very popular heart-shaped chamber. You decide to swap heads, a good OEM choice is the late 1990s Vortec truck Piston deck, that moves piston-to-head clearance to over 0.060-inch, which is Keeps the piston-to-head clearance fairly tight at 0.046-inch. This will increase the quench area, which reduces staticĬompression and also affects how well the quench performs. Production small blocks were built with the piston placed closer to 0.020-inchīelow the deck. Flat top pistons with 6cc of valve relief that sits 0.005-inch.Head gasket thickness, and piston valve reliefs (if present) or the presence ofĪ dish or dome in the piston. Static compression ratio is affectedīy multiple variables including crankshaft stroke, piston-to-head clearance, We’re talking about 91 octane premium gasoline.Īssume you are running a 4.030-inch bore. We’ll further qualify our answer with the assumption that With a 4.030-inch bore at that compression ratio on today’s rather poor pump Short answer to your question is that you should be able to run a small block Simple questions like this one often result in more complicated answers. Will that work on 91 octane pump premium fuel? I want to build a 350 Chevy with iron heads and a 10.0:1 compression ratio. This is often described as a heart-shaped chamber that reduces volume while improving combustion efficiency. Notice how the chamber pulls inward between the intake and exhaust valves. Hence the - (negative) number in the calculator.This is a tight shot of a 64cc combustion chamber in an iron Vortec head. Same goes for a dome where it is positive cc's on the piston but a reduction in cylinder volume. Hence the positive number in the calculator. This seems very confusing but it is because even though it is a -cc on the piston, those same cc's are gained in cylinder volume. The cc for the piston is entered as a positive number on a -cc Dish or Flat top piston and a negative number on a dome piston. Apparel, Cups, Decals, Books, Gift Cards.
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