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# Inertia sweep: an inertia dyno system provides a fixed inertial mass flywheel and computes the power required to accelerate the flywheel ( the load ) from the starting to the ending RPM.
The actual rotational mass of the engine ( or engine and vehicle in the case of a chassis dyno ) is not known, and the variability of even the mass of the tires will skew the power results.
The inertia value of the flywheel is " fixed ", so low-power engines are under load for a much longer time and internal engine temperatures are usually too high by the end of the test, skewing optimal " dyno " tuning settings away from the optimal tuning settings of the outside world.
Conversely, high powered engines commonly complete a " 4th gear sweep " test in less than 10 seconds, which is not a reliable load condition as compared to operation in the real world.
By not providing enough time under load, internal combustion chamber temperatures are unrealistically low and power readings-especially past the power peak-are skewed to the low side.

1.893 seconds.