[serialk11r]

The diameter of the pulley is small enough that the reduced mass shouldn't be a big factor in terms of how much energy is wasted accelerating it. IIRC there is actually an effect on main bearing #1 friction from a heavier pulley, but again 2lbs is not much force. Lighter flywheels have a much bigger effect since they have twice the diameter.

Still, I am a fan of lighter pulleys, because in terms of lbs saved/dollar they are usually a good deal. Might as well do a little underdrive while you're at it.

One thing I've thought a little about is a water pump relief valve that feeds water straight from the outlet back to the inlet when the pressure exceeds some level to delay cavitation, but it's probably not worth the added complexity.