[Vwdiesel] underdrive pulleys

[Roger Brown]

adamo robison wrote:
> opinions on underdrive pulleys. i don't know anything. i think theyre just for accesorries. would turning the water pump slower help cooling, the water remains in read longer? is that crazy. would it help HP.
> thanks

I put an overdrive pulley on my water pump and got better cooling in the form of less 
temperature rise under load.

For underdrive pulleys, their big benefit is at higher RPMs, like you see on high revving 
gas engines.

-- 

   Roger