![]() Increasing the compression ratio effects a number of factors.ġ) Fuel octane requirement. I stick by my original answer, however I have 10 min to kill, so in addition to an answer I will explain why, even though that was not asked. Rod RE: Compression power increase crysta1c1ear (Automotive) 24 May 07 23:45 Obviously, I guess, I went off track with that "all things remained the same", except. I have yet to find a computer program that works for my cars, or at least for me (pre computer geek). I settled on 13.87:1 (it just worked out that way) at 110.48hp 7200rpm. All tests on same dyno and corrected to std. Fuel was Sunoco 108 for test 1 thru 3, VP 110 for test 4, unknown for test 5 and 6 (most likely Sunoco 116). That engine was not mine, but the same type and configuration. All things remained the same (except for pistons) for all but the last run. Don't get too excited if the numbers don't match theory, in my experience, they never do. I have used an 'online' program to interpret some of my dyno runs on the Mini. PRINT# file, STR$(cr)+" "+STR$(FN_FuelAirEfficiency(FN_OttoEfficiency(cr),phi)) Phi=1 : REM fuel-air ratio relative to stoichiometric REM Formulae (see page 8 of 29) and Free Demo BASIC Interpreter fromĬv = 7 : REM degrees of freedom x, y, z, like propellor, like spokes & 2*pogo REM to partly answer a question posed here REM Compression ratios and engine efficiencies written to a file ![]()
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