Your engine actually has two compression ratios, static compression ratio and dynamic compression ratio. It relies on measured values to calculate your static compression ratio. General rule of thumb for acceptable dynamic compression ratio to run safely on pump gas is 8:1 maximum for engines with cast iron cylinder heads and 8.5:1 with aluminum cylinder heads. A typical compression ratio calculator as found in Motion Software's Desktop Dyno program. However, that same 11:1 static compression ratio engine with the radical 259/269 duration camshaft would have a dynamic compression ratio in the neighborhood of 7.5:1, totally acceptable to run on pump gas. and capable of keeping a 13-1 468 BBC out of detonation, and clearly the. 2 Bore, stroke, displacement, compression ratio, power and torque Bore 3. Therefore with the mild cam it will have a high dynamic compression ratio, probably 9.5:1+ which would be way too high to run safely on 91 octane gas. Compression Ratio Calculator This 383ci small block Chevy is being built to run. Use the formula (cylinder diameter / 2)2 x x stroke to find the swept volume. If you put a very mild camshaft (194/204 duration this cam will have an "early" IVC (intake valve closing point), and will "bleed off" less compression than a radical camshaft with 259/269 duration and a considerably "later" IVC. Final compression ratios in excess of 12.4:1 are not recommended for use with ' 92. It is to be used as a guideline in determining the proper maximum boost level for a specific application. To give an example, lets say you're considering only pump gas for your engine, and it has a static compression ratio of 11:1. This chart shows the final compression ratio by combining the static compression ratio of an engine and the maximum blower boost from the blower system. Leave at 0.000 to use default values OR change any value to. Unlike Static Compression Ratio, Dynamic Compression Ratio takes into account camshaft timing by considering the intake valve closing point in relation to the piston position. V-Twin Compression Calculator Pick Engine Size Use for custom configuration or oversize bore. Static Compression Ratio numbers are the ones you hear thrown around the most ("10:1 compression"), and it takes into consideration the full sweep volume of the cylinder in regard to its range of crankshaft stroke. Wallace Racing BACK to Calculators 04:14:09 AM. This calculator will calculate both Static and Dynamic compression ratioĬompression Ratio is the ratio of an engine's cylinder volume vs. PONTIAC POWER RULES Calculate New HP From Change In Compression Ratios.
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