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 11:24 PM..
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