11/21/2023 0 Comments Compression ratio calculator bbcGeneral 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. 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. /rebates/2farticle2fhow-to-calculate-compression-ratio&. 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. United Engine and Machine (UEM) offers a dynamic compression ratio calculator that inputs static compression ratio, stroke, and connecting rod length along with the intake closing number at 0.050-inch tappet lift plus 15 degrees. 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. Remember, this is one of those equations that work for some cases and leave you scratching your head for others. This 383ci small block Chevy is being built to run on 87 octane, which with aluminum heads will limit our safe compression ratio to 9.7:1. The formula that is used is: Effective Compression ( (Boost PSI / 14.7) + 1) Current Static Compression Ratio. We hope to achieve a safe compression ratio of around 13:1 running on either E-85 or 93 octane with an additive. Leave at 0.000 to use default values OR change any value to. Hit the SAMPLE button to see how it works. V-Twin Compression Calculator Pick Engine Size Use for custom configuration or oversize bore. The program takes PSI or BAR as the pressure but will only display the. 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 is simple determination of rough engine horsepower output based on a 'mean' cylinder compression ratio. If your motor is normally aspirated boost is 0. If the engine compression ratio is higher, less boost is recommended. This calculator will calculate both Static and Dynamic compression ratioĬompression Ratio is the ratio of an engine's cylinder volume vs. The best compression ratio for supercharging or turbocharging with a 5 to 8-pound boost range is 8:1 to 9:1 ratio when used with 92 octane gas.
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