nickprelude

base comp. ------------- boost psi
ratio ------- 4 ---- 6 ---- 8 ---- 10 --- 12 --- 14 --- 16
8.5:1 ----- 10.8:1 12.0:1 13.1:1 14.3:1 15.4:1 16.6:1 17.8:1
9.0:1 ----- 11.4:1 12.7:1 13.9:1 15.1:1 16.3:1 17.6:1 18.8:1
9.5:1 ----- 12.1:1 13.4:1 14.7:1 16.0:1 17.3:1 18.5:1 19.8:1
10.0:1 ---- 12.7:1 14.1:1 15.4:1 16.8:1 18.2:1 19.5:1 20.9:1
10.5:1 ---- 13.4:1 14.8:1 16.2:1 17.6:1 19.1:1 20.5:1 21.9:1
11.0:1 ---- 14.0:1 15.5:1 17.0:1 18.5:1 20.0:1 21.5:1 22.9:1

just thought this might be a useful chart if anyone cares.

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Racing in a mustang is like the special olympics............even if you win you're still retarded.

jsmooney

damn, many, like me, would have never thought it would be that high!

fleshbox

22.9 CR = 336 PSI if anyone cares.... that is roughly 2800 lbs of force pushing on each cylinder (I couldn't remember the exact size of the cylinder)

nuro

i see that chart and all i think is "ping, ping, ping" lol

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1999 Prelude 2.2 VTi 4WS
I speak fluent typo

brendon2k

this chart is just to show what the equivalent compression would be to that of a boosted motor, correct? the compression ratio is a set number set by the parts of the engine.

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-Brendon-
09 - Subaru Impreza
07 - Honda CBR 600RR

fleshbox

it lists the amount of compression inside the cylinder at TDC for different CRs and boost levels...


ie a 10.0:1 CR with 10 lbs of boost will result in a total compression of 16.8:1, or 247 PSI inside the cylinder at the top of the stroke...