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Location:
Vancouver
Registered:
June 2004
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Re: estimate HP??
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Wed, 30 June 2004 14:52
 
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estimate HP output this way...
(1E-05) x (rpm for HP peak) x (pressure ratio) x (cc displacement) x (your chosen fudge factor, or "HP indexer") = approx HP target
let's say a 1800cc, running 6000rpm peak HP, and 15psi...
.00001 x 6000 x 2 x 1800 x 1 = 216HP
If you are trying to figure out a N/A motor, the combustion efficiency goes up a bit due to the greater expansion ratio of higher compression, but the turbo pressure ratio disappears...
let's say a 2000cc, running a HP peak @ 7000, no turbo...
.00001 x 7000 x 1 x 2000 x 1.25 = 175HP
Make any sense? It's not exactly a scientific report, or anything quantified to measure your motor by, but it's a helpful way to estimate your anticipated output if you are honest about a few things...
(if you want dreamy numbers, put in a dreamy "HP indexer" number, but generally, turbo motors will be around 1 - 1.05, and N/A motors will be around 1.15 - 1.30 depending on compression ratio and port flow capability)
Cheers
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