heat exchanger

[aussie]

I want to enlarge my heat exchanger it was suggested to me from spares if i remeber correctly ---now do i buy a lager one or run another small one with the one i got--the reason why i want to incerease the size of it cause my engine will produce more power so more heat will come with it--Im removing the water pump and fitting a electric one that flows 115gph there is a 80gpm but i think its too small---had a look on ebay au seems theres not much in heat exchangers

[spareparts]

change over to the 4" (10 cm) heat exchanger. I don't see any reason to change the circulation pump, if you move the water too fast, it won't have time to transfer the heat. The pump on the engine works fine. If you have to have an exchanger manufactured for you boat, measure to see if a larger one would fit. I'd rather have a bigger exchanger than a bigger circulation pump

[smokeonthewater]

Agreed..... I think that you are better off with the stock pump

[aussie]

Originally Posted by spareparts

change over to the 4" (10 cm) heat exchanger. I don't see any reason to change the circulation pump, if you move the water too fast, it won't have time to transfer the heat. The pump on the engine works fine. If you have to have an exchanger manufactured for you boat, measure to see if a larger one would fit. I'd rather have a bigger exchanger than a bigger circulation pump

do you measure the outside and what about the length what should that be

[aussie]

the reason i want to use a electrical pump is i want to do away with the seal in the timing cover and i dont like the extra load the pump puts on the timing chain and i will gain a little hp as well

[Cam]

The one thing wrong with the electrical pump is that if the engine quits running, the pump will not stop and could cause water to flow back into the risers. This could cause water ingestion problems that could easily kill an engine. I would personally stay with the pump on the engine and get a bigger heat exchanger.

[spareparts]

same length as the small one, just bigger diameter, i think its the size of the end cap
heres a 4" http://www.ebay.com/itm/MERCRUISER-3...7ff6a4&vxp=mtr

[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