[Tcoat]

Originally Posted by DSLeach

Indeed, your pulley discussion is correct in that you won't be able to measure the small amount of power freed up by using a slightly lighter pulley. It's simply not that large of a component in terms of diameter or mass.

But dropping 10 lbs off your flywheel, especially if the mass is removed from the outside diameter of the flywheel, will make a small but measurable difference. Likewise, dropping a couple pounds off each wheel/tire will make a small but measurable difference.

The reason I challenged the original post is because the following statement

"It is NOT POSSIBLE to get "more hp" by reducing the rotating mass of the engine or drivetrain.
It does not Make more HP or "free up" more HP.
Removing weight from the rotating mass will give you the exact same benefits as removing that same weight from anywhere else on the car."

is simply not correct. Lowering the rotational mass of the drive train will most definitely "free up" HP that is then available to provide higher linear acceleration to the vehicle.

Cheers!

See that is my issue whenever this damned pulley conversation comes up. It always gets extended to many other components and then their overall affect is considered the equivalent to reducing pulley weight. Just not so.