![]() It will also estimate a dynamic effective compression ratio taking into account the cam timing and rod ratio. 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. In todays video were talking about your engines compression ratio. (considers cam timing and rod ratio) This calculator will give you the proper compression ratio with a known piston head volume. We're looking at the first of these ways here. A richer launch AFR of only a small difference at 3.1 to 1 (lambda 0.48) slowed the 60-foot time by a tenth of a second. This compression calculator is intended for use as a general estimate of your engine compression ratio only. Jack-rabbit starts for fastest 60-foot times were maintained with a launch AFR at 3.2 to 1 (lambda 0.49). 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. Here’s a blown alcohol funny car which used numerically determined AFR tuning. There are two ways of calculating the compression ratio for an engine. 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 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. Then, for the June '01 issue, we tested another small-block with an XE268 camshaft, this time with a 9.75:1 static compression ratio that produced a cranking compression of 175 psi. LS Cylinder Heads by Casting Number 10215339 LS Small Block V8 1997 346, LS1. Even the best calculator is only as good as the input information. This compression ratio calculator can be used to work out the compression ratio of your engine. Milling Heads for specific Compression Ratio. Engine Pros new performance calculators make life a lot easier when building an engine.
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