#355 chevy compression ratio calculator full#

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. (Edited) This is just my opinion so take it or leave it. Use the formula (cylinder diameter / 2)2 x x stroke to find the swept volume.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. If you build the same 350 engine with longer 6-inch rods, the rod ratio becomes 1.72. 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. The rod ratio in this engine would be 5.7 (rod length) divided by 3.48 (stroke), which equals 1.64. This calculator will calculate both Static and Dynamic compression ratio Compression Ratio is the ratio of an engine's cylinder volume vs. 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. 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. Compression Ratio Calculator Deck Height Calculator Rod Ratio. 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. 355 - 3.470 Stroke Small Block Ford 351W.

#355 chevy compression ratio calculator full#

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. This calculator will calculate both Static and Dynamic compression ratioĬompression Ratio is the ratio of an engine's cylinder volume vs.