Sean

Kool...now I don't feel so bad.

Thanks for the info...BTW, who is Dennis Moore?

Biggus

Dennis is the author of Big Block Marine Performance.

It is the best book out there as far as building a BBC boat engine.

He also wrote the bible on small block power.

Kurt.

Allan4

No one has mentioned low water pressure. The two of these combined (high oil temp and low water pressure) would mean either an impellar going bad or a clogged water line somewhere (probably from the impellar going bad as well). I'd look there if you are still having issues.

Allan4

Oh, by the way, 210* is probably hot enough to boil off condensation.......270* seems pretty damn hot, but D. Moore knows more than I do.......

blue thunder

That must be "new math" Allan4.... I always thought the boiling point of water was 212. .... I agree tho... the oil temp is probably above 212 up stream of the sender when the guage reads 210... meaning of course, allan4 is correct in reality.

BT

Waterfoul

I would agree with Allan4 (did I just say that??) about the water pressure. If the sender swap doesn't shed any light, start looking at the water system. And I also agree that 200 is too cool. Mine runs at 215-220 at 3500 rpm cruise, 230-235 at WOT blasts. Never goes above 240, even after several minutes of WOT running.....like chasing Rambunctious last Wed. on our JCI Poker Run. What a blast. Then again, the water was only 55 degrees that day. Brrrrrrr!!!!!!!!

Sean

Ohhh...that Dennis Moore...I thought you were talking about the other Dennis Moore

I just replaced both pumps, so I don't think that is the problem, so I'll look into swapping the senders.

Where do you guys have the sender located?

Thanks again guys!

Biggus

My senders are mounted in the remote filter housing. After a really hard run I`ll see 260* before the oil goes through the cooler.

Sean

Biggus...I never really realized that the temp was taken before the cooler, so that is another plus...

How about the oil pressure after the hard runs?

The reason I am asking so many questions is because this 540 had bearing failure and I thought is was due to the hot oil and low pressure...you see after a 230-250* romp, the oil pressure would go to about 5-10lbs when I dropped it to an idle...it got progressively worse until 2 bearings failed.

Now it seems that it will still get just as hot, but I haven't run it hard enough or long enough to see where the pressure is going to go...the goos news so far is that th minute I drop it down to idle speeds, the oil temp immediately drops...before, it kinda hung out up in the 240 range for a while...

I really don't want to be replacing another motor anytime soon.

Biggus

I`m not running any thermostats, oil or water. When cold, I`ll have almost 80 lbs and I do not rev it past 3500-3800 until the oil temp gets to 200* after the oil is up to temp the pressures will be around 40* at idle and 60* wot.

Good luck,
Kurt.