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gone-ot · 03-01-2014, 01:14 PM

Like this (1L = 61.024 cid) quick answer:

T = (hp × 5,252)/(rpm)
T = (12hp × 5,252)/(2,000 rpm) = 31.512 lb·ft

BMEP = 150.8 × (T/D)
BMEP = 150.8 × (31.512 / 61.024) = 77.871 psi

However, more specific engine data is needed for meaningful results--like bore & stroke, CR, VE, value timings--for determining piston velocities, dwell times, assumed intake/exhaust flow rates, etc.

03-01-2014, 01:14 PM	#69 (permalink)
gone-ot ...beats walking... Join Date: Jul 2009 Location: . Posts: 6,190 Thanks: 179 Thanked 1,525 Times in 1,126 Posts	Like this (1L = 61.024 cid) quick answer: T = (hp × 5,252)/(rpm) T = (12hp × 5,252)/(2,000 rpm) = 31.512 lb·ft BMEP = 150.8 × (T/D) BMEP = 150.8 × (31.512 / 61.024) = 77.871 psi However, more specific engine data is needed for meaningful results--like bore & stroke, CR, VE, value timings--for determining piston velocities, dwell times, assumed intake/exhaust flow rates, etc. Last edited by gone-ot; 03-01-2014 at 10:24 PM..