![]() ![]() 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. This technique is suited to someone who is in the middle of putting an engine together and has the right tools, or someone whose engine is already in pieces. Compression Calculator Simply fill in the form below to calculate your compression ratio 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. We're looking at the first of these ways here. 355 Compression Ratio Thread starter 1981zapper Start date 1 2 Next. This compression ratio calculator can be used to work out the compression ratio of your engine. Firstly, you can make a math calculation as accurately as possible, or secondly - the more popular method - uses an empty spark plug socket with a pressure gauge inserted. I’m curious to what kind of compression I have in my 355. There are two ways of calculating the compression ratio for an engine. Twin carburetors recommended for 4 cylinder engines. For single carburetor (350 holley), 6 cylinder engines. Power Range: This range is designed for modified street, limited modification race or speedway. so even with a zero deck height, it would still be. Higher compression ratio not required, Larger valves not recommended. ![]() 020 off the top of the piston, where a normal 350 piston would have a 1.560 compression height, these have 1.540. ![]() The compression ratio is the ratio between two elements: the gas volume in the cylinder with the piston at its highest point (top dead center of the stroke, TDC), and the gas volume with the piston at its lowest point (bottom dead center of the stroke, BDC). The 345NP piston, is '.020 destroked' meaning, it has. The compression ratio of an engine is a very important element in engine performance. How to use this calculator: Simply fill in all the boxes below with the requested figures and click on "Calculate CR" to find your engine's compression ratio. This compression ratio calculator can be used to work out the compression ratio of your engine. ![]()
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