Handy equations thread

Harey

1000RPM
Ft-lbs x 1.35 = Nm

Kmh x 0.6214 = Mph

Lbs / 2.2 = Kgs

those are some that I pretty commonly use
 

Lipton

75RPM
I know this one from Miura. To calculate the torque @ peak power when making torque curves from scratch there`s a very simple formula. Let`s say we have a 2.0diesel with 400Nm @ 2000rpm and 150hp @ 400rpm. The formula is as follows: 150(max power)/1.35x9549/4000(max power rpm)=265.25Nm@4000rpm
 
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