yes dyno BS sells engines in honda-cadet, fathers who are not interested in engine basics are soon relieved of lots of money and they feed off the dyno BS, thinking they are getting something astonishing, where in reality they are not, this is why people are now buying their own dynos.
D-I-y71. I stand corrected sir! apologies, I have made a school-boy error, at the time my wife was rushing me to sit down for dinner!...... but the principle still stands, the correct calculation is below, angular acceleration and inertia is how the torque is derived, particularly on an inertia /flywheel type dyno.
The torque calc is:
Torque = flywheel Inertia x angular acceleration
Angular acceleration = delta angular velocity / delta time
Power = Torque x Angular velocity
My point being, you do not have a torque meter on an inertia/flywheel dyno, the torque is derived from an acelleration calculation in the software, and this is how I believe big differences occur between different dyno manufacturers, as the software engineers interpret the gradient of the torque versus time plot in a different way.
I dont design dynos, but I do design very high performance and rapidly accelerating electrical motors for a living, the theory is all the same, and this is a common problem we have, the differences in peoples interpretation leads to big variations in results, this is why DIN, SAE and ISO sometimes need to step in to level the playing field.
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