The formula that is used is: Effective Compression ( (Boost PSI / 14.7) + 1) Current Static Compression Ratio. Hit the SAMPLE button to see how it works. The program takes PSI or BAR as the pressure but will only display the. 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. If your motor is normally aspirated boost is 0. 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. 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. 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. specific Compression Ratio you are looking for. 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 Calculator is designed to tell you how much you need to mill your heads to achieve the. 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. But a similarly built 540 with a 112 LSA, builds only 165 psi cold cranking compression due to its later intake closing point and even lower dynamic. In this example, the bore (4.600in) and exposed cylinder 1.5in equals 40.9 cc. 050 cam, with a 108 LSA has a cold cranking compression of 175 psi. Volume () x (bore radius squared) x (exposed cylinder height). 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. 2 Bore, stroke, displacement, compression ratio, power and torque Bore 3. For example, my 540 BBC motor with 10.75:1 static compression ratio ( 7.43 to 1 dynamic compression ratio) and a 266/272 at. 2cc Videos Technical Specs Compression Ratio The GT Series of CHP Short. Understanding the 4 Key Individual Timing Events for Camshaft Selection. BBC CHEVY 572 DART SHORT BLOCK FORGED PISTONS SCAT CRANK & RODS +12CC DOME TOP. This calculator will calculate both Static and Dynamic compression ratioĬompression Ratio is the ratio of an engine's cylinder volume vs. NOTE: Looking for the Summit Racing Cam Timing Calculator Find it and several other helpful calculators and tools to help you determine compression ratio, gear ratio, CFM requirements, and more on Summit Racing’s Calculators and Tools page.
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