Running temp for inboard V8

[allyd]

Hey all, I'm running a 5.8 metre V8 jet boat (Hamilton Stage 3) and recently had a little trouble with it overheating after taking it down to the Lower Murry for a spin. I pulled apart everything to do with the cooling system and found nothing obvious, in fact it was the cleaneist motor I've ever seen. I've had the boat only a short while and it has been running fine, I estimate we've done aboat 60 odd km's. I put everything back together and fired it up and it run up to temp of about 190 to 200 deg F. So my question is what temp would I expect to see from a inboard V8 running a 4 1/2" dia. x 17" long heat exchanger. Is the heat exchanger to small? My only conclusion is that I may have sucked up some weed or something and temporally blocked the cold water intake. Any input would be appreciated.

[Spaniard_King]

Hi Allyd,

my head hurts to much to do the calc..but 80 deg C should be the max temp your engine should be run at for long periods. You have checked the impellor, pick up and wear plate for wear and blockages. If it has had an impellor problem in the past thyere may be some parts of the impellor which have lodged in the heat exchanger.

I take it you are running a fresh water system or is it straight salt.

Make sure you keep a good check on the anodes

Garry