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there are also different dyno methods
from my understanding if you use friction dyno you are measuring torque and then calculating the HP using a simple math formula
measuring the torque is where the problems lie
you have to overcome the inertia of the friction bed before you get accurate torque
problem is all your gears are torque multiplies, you also have a final drive gear which is another torque multiplier
so the 2 torque multipliers x inertial loss just to measure the torque already introduces a lot of mistakes
then you have to calculate HP
then you still want to guestimate crank HP? forget it!
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