Quote:
Originally Posted by stugray
Maybe if I saw the raw dataset I could be convinced.
However I look at the graph (the thin lines or the Moving averages) the time rate of change (the slope) appears to be the same for both datasets.
The moving averages seem to amplify this statement.
The slopes of the averages are the same.
Even the slopes of the thin lines appear to be identical with few exceptions.
Even if you argue they are different, they are not "different enough" for a statistically significant difference.
I would be interested for someone to actually calculate the rotational inertia of the various engine components.
Coming up with a total number analytically would be very difficult.
I think I could argue that removing grams from the perimeter of the starter teeth on the FW would make a bigger difference than 4 lbs from the pulley.
Or grams from the alternator pulley since it spins at ~4-5 times the speed of the engine and the kinetic energy is proportional to the SQUARE of the rotation speed.
So if the alt pulley rotates at 4X the crank speed, then a change in mass of the alt pulley would be 16X more effective than the same mass change in the drive pulley.
(of course I am guessing at the drive multiplier)
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Don't forget oil viscosity changes due to temperature, both in the engine and transmission.