Thread: max oil temp and min oil pressure

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talked to my machinest today and was told the rod clearance was setup at
.028. so I dont think thats the issue. I was instructed to put a good 50 wt in it and run it and it will be better so I will try it and see. If I cant get the oil temp down to 215-225 then I will have to re plumb the oil cooler to its own open water source. I think my problem may be the pressure regulator I had to install to keep the block pressure down to 18 psi. when I ran it without it was way to high and I started blowing freeze plugs out.


100 on the water is fast and no you dont have brakes you have to pick your water wisely. I have been in boats my whole life, seen many pepole die from it. saftey is my main concern so no full passes with passengers or lots of pepole on the water. when making passes I wear a life jacket that is racing approved. no second chances in life when playing with big MPH on the water...

I don't understand running the block at 18 psi. Why would it not be evacuated as good as possible? Positve pressures will advance the likelyhood of seal problems and actually reduce oil flow through the bearings. The ambient pressure is a boundary condition for determining flows through the bearings.

Kitz

Where is the cooler in relation to the regulator? It could well be the problem if it's restricting the flow .

Originally Posted by R Pope

Where is the cooler in relation to the regulator? It could well be the problem if it's restricting the flow .

this is the cooler I run here it is right after the pressure regulator

Originally Posted by kitz

I don't understand running the block at 18 psi. Why would it not be evacuated as good as possible? Positve pressures will advance the likelyhood of seal problems and actually reduce oil flow through the bearings. The ambient pressure is a boundary condition for determining flows through the bearings.

Kitz

look at the radiator caps on your cars and trucks they all have a PSI rating on them. the reason for this is I run a jet boat the water is supplied from the pump to the engine. with a properly setup jet pump it will have anywere from 20 to 300 PSI of water pressure feeding the engine. I had a problem with loosing a freeze plug while I was only at 2500 RPM the gage was showing over 60 psi of block pressure. WAY TO MUCH IMO. so its set at 18 PSI now the block runs were I want it to with no hotspots that can be found.

Originally Posted by Fourq

look at the radiator caps on your cars and trucks they all have a PSI rating on them. the reason for this is I run a jet boat the water is supplied from the pump to the engine. with a properly setup jet pump it will have anywere from 20 to 300 PSI of water pressure feeding the engine. I had a problem with loosing a freeze plug while I was only at 2500 RPM the gage was showing over 60 psi of block pressure. WAY TO MUCH IMO. so its set at 18 PSI now the block runs were I want it to with no hotspots that can be found.

Gotcha, I'm sorry, I misunderstood

Kitz

I don't get a pic from your link. Does the reg. bypass water overboard, robbing the cooler of flow?

Originally Posted by R Pope

I don't get a pic from your link. Does the reg. bypass water overboard, robbing the cooler of flow?

no it is simmiliar to the ones used on houses, it reduced pressure but not flow

Originally Posted by kitz

Gotcha, I'm sorry, I misunderstood

Kitz

no biggie just want to be clear to get the best advice I or anyone else reading can