In article ,
"Morgans" wrote:

"Orval Fairbairn" wrote

IIRC, George meant to use a water pump such as used on Merlins or
Allisons. he found the automotive pumps to be lacking.

I was unaware that a water pump for a Merlin or an Allison would fit on an
American V-8! g

Really, though, I don't understand what he would be referring to. Is it
something like what is commonly used on racing (NASCAR) engines? What
companies make something compatible, in that design?

I had always thought that special design was needed to get the accessories
running at a slower than stock RPM, either by using a smaller than normal
drive pulley, or larger than normal accessory pulley. I would think that
better bearings would be good things for a water pump.

I, also, am not sure what George was referring to. Military engines have
standard accessory mountings, so, I am assuming that coolant pumps would
simply bolt on to the accessory cases. You would have to add a similar
provision to an auto engine.

Yes, bearings were the weak point in the auto pumps.