heat exchanger

[smokeonthewater]

the circulation pump doesn't affect the risers in any way.... closed system with antifreeze

you won't gain any horsepower though... you may even lose some... the pump still takes energy to drive tho now it will go through the alternator and be converted to to electricity (with losses) and then be converted back to motion by the electric motor (more losses) Also the pump will be running full speed at all times so even if you are idling you will be using the same hp on the pump that you would use at wot.

[THEFERMANATOR]

I wouldn't use an electric water pump for 1 simple reason, and that is electrolisis. Even in a freshwater enviroment electrolisis is an issue, and will wreak havoc with corrosion. And chances are you won't see enough HP gain going to one to justify the long term realization that electric motors tend to be short lived in a marine enviroment.

[aussie]

got me thinking

[spareparts]

don't over think it or over complicate it, if its on a boat, it will break, the key is making it so it won't break often. Take a picture of the heat exchanger(or your existing heat exchanger) to a radiator shop(big truck radiator shop) see if they can make you one that's larger in diameter, your existing one is referred to a 3", the later models had a 4 ". It would be interesting if a 5" one could be fitted. Try using cardboard tube, pvc or anything that can mock up the heat exchanger on your engine and see how big you can get away with

K.I.S.S. principle Keep It Simple Stupid!

and no, I'm not calling you stupid