Underdrive pulley recommendations?

[Topless]

Originally Posted by JFP in PA

There are significant advantages to an electrically driven water pump:

1. Reduced mechanical drag on the engine (frees up HP); the higher the engine revs, the more power is saved (drag goes up with engine speed).
2. Slows down the circulation of coolant to a constant speed (higher RPM’s actually reduce the ability of the coolant to exchange heat with the air at the radiators because it is moving too fast).
3. Compact; no pulley or belt is required, so it takes up less space.
4. Works if the belt fails.

By-the-by, electrically driven water pumps are commonly used on race engines for the above reasons……………

Te primary reason that more aftermarket manufacturers are not involved with making them for the M96 engine is the small population size of the application.

Sorry JFP, maybe I am just a little dim. I still don't get it:
1. You still have mechanical drag, just at the alternator instead of the WP, plus inefficiencies of conversion.
2. A smart variable speed pump that measures coolant temp and maximizes heat transfer at all rpms would definitely be useful. A real plus if there is such a thing. I have just never seen one this sophisticated.
3. We already have a belt and pulleys on our cars, no space savings.
4. Works if the belt fails, not if the circuit fails. Seems like a wash.