Engine getting hot
 

Looking for advice and possible solutions to plumbing raw water
in twin engine setup.

One engine under heavy throttle will creep past 180 degrees with oil temp
at 230 degrees. Water pressure pins gaffrig gauge 35 lbs plus.

Other engine runs 110 water. Oil is at 210. Water presure is 25 lbs max.

It seems to operate like this now with the addition of the superchargers.

The engine will run approx 130 to 150 normal cruising (3000 rpm)
When your on the sticks at over 4500-5000 rpm then she well creep up.
Have not had opertunity to hold at 5000 for exstended time Due to water conditions and speed over 100. But I feel it will get hot. This is only happenning on one engine.

The water flow is: thru hull pickup to strainer to merc raw water pump
to power steering cooler to trans cooler to oil cooler then to front of
crossover then thru front of Mooneyham intake then to each header
then dumped thru 1 inch transom

The water temp is being measured at one of the manifold dumps before entering header. Water pressure is measured back of head.

All new water pumps. Back flush entier system. When idling looks like there
is same amount of water coming out of dumps compared to other motor.

I am thinking of adding some dumps to the back of the heads possibly
3/8 id then out the transome. My thought is it will aid in releaving water
pressure and at the same time allow more flow. What do you guys think???
I am considering this rather then the merc dumps at the crossover this would limit the flow to the engine.

I have played with the amount of the thru hull lenth by moving it in further
thus not sticking out as far. This helps pressure but not temp.

540 bowties
Merlin cast iron heads
Cometic Head gaskets
Crane 741
Intercooler (plumb seperatly)
8lbs boost
Timing locked at 32
Arneson surface drives


Please respond with any Ideas or thoughts
Thanks in advance
Gerry

Re: Engine getting hot
 

I prefer to plumb the intercooler then oil cooler from the pickup that is ram fed. That way the engine is not intercooled at idle and neither is the oil cooled. Reduces fuel puddling and lets the oil warm up.

Taking the preheat from the engines by plumbing like that might help. Not sure what to do with the trans cooler.

Re: Engine getting hot
 

Thanks for the response Info. By the way thats a killer Trident 540 ya built.
The intercooler is all by itself force fed via another thru hull pickup to its own strainer to the back of the richard lee interccoler then a # 16 dump thru transom.

Its bugging me that one is nice and cool while the other gets hot.

Gerry

Re: Engine getting hot
 

<<Just a rookie here but have you verified accuracy of gauges? Looks like one motor is warmer by oil temps but water temp at 110? just a thought.

Re: Engine getting hot
 

Good point I verified with my IR gun.


Gerry