Quote:
Originally Posted by yorkie_chris
Engine temp, air temp, fuel density +101 other factors!
Weight of the cogs you're spinning though? Constant mesh box innit. And only a factor on an inertial dyno.
Anyway, we are going around in circles. We know it's dynojet dynos that are full of s*** and there are a million ways to play with the power readout.
Adjustment factors for crank power are one of my pet hates. It's nothing more than a guess. What's more it's a meaningless, misleading guess which is no use to man nor beast unless you just want to brag down the pub!
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I'm generalising with the reference to gearboxs. Whilst there will always be contacting, the number and size of driven cogs at anyone time will differ.
I agree crank torque/power is meaningless to a certain extent. But if you want to tune high performance engines, you need the crank output so you can see what the losses are at the back wheel and then look to minimise the losses.