oil cooler

[Akros]

Would an oil cooler take care of the oil question? I am assuming that the reason for special oil in a marine engine is because of the oil temp gets a lot higher than in a car or truck or is there more to it than that?
Anybody know what the temp gets up to in a typical I/O?

 

[83Evinrude]

Re: oil cooler

I would say the oil temp in a boat is lower than in a car or truck. Generally 160-180 degrees is all a boat will run (coolant temp) where in a car or truck more like 195-210 depending on what its doing (towing etc).

In regards to marine oil being special, normally its just a bit thicker 5W-30 (car) vs. 25W-40 in a boat and that has mainly to do with the higher RPM and loads a boat is under. There are also additives in some marine oil that may help with corrosion etc.

The only cooler on my boat is for power steering, since the engine block has plenty of water for engine oil cooling I doubt its needed except for possibly some racing and or commercial use.

 

[Bondo]

Re: oil cooler

I am assuming that the reason for special oil in a marine engine is because of the oil temp gets a lot higher than in a car or truck or is there more to it than that? Anybody know what the temp gets up to in a typical I/O?

Ayuh,... Actually,.. There's alot Less to it.... Oil is Oil,.. The base stocks,+ additive packages change,...
But oil is still oil....
Generally speaking,... oil will run about 0? to 20? hotter than the coolant, in ANY motor...

My 4.3LX is swimming in Mobil 1, 15W-50....
Another favorite of Many are the oils for tractor-trailer Diesels... Rotella, or Delo...15W-40 in Dino, or Syn-oil...

 

[Philster]

Re: oil cooler

Engine oil would suffer from cooling. It flows and protects best at operating temps. Oil is oil, but boy oh boy does it do so much more than lubricate. It has specific dirt suspending ability and detergent properties, along with an ability to hold water (the water that is a byproduct of combustion).

Trans fluid (like in your car or towing truck) benefits from cooling, because it is hydraulic, and heat changes the properties of hydraulic fluid, especially one that is doing double duty as a lubricant/protectant. Without and oil cooler on a trans, there is no other efficient cooling mechanism.

And boats are easy on oil when it comes to temps: 175 degrees when running my 502 Merc hard. What boat motors do to oil is subject it to a heck of alot of combustion and more revs per hour than any car. To run at 45, I am turning 4000 RPMs or more to just cruise. A big car engine would be turning 2000 to cruise!

 

[180shabah]

Re: oil cooler

Would an oil cooler take care of the oil question?

I guess that would depend on the question.

Exactly which wheel are you trying to reinvent???

 

[Howard Sterndrive]

Re: oil cooler

Would an oil cooler take care of the oil question? I am assuming that the reason for special oil in a marine engine is because of the oil temp gets a lot higher than in a car or truck or is there more to it than that?

cooler might oil allow for thinner base stocks, generally.

Many Volvo Penta AQ series setups used an engine oil cooler. In those units, VP recommended 10W30 oils.

Anybody know what the temp gets up to in a typical I/O?

I seem to recall seeing around 235F... or maybe I heard that on a course once... not sure why that number jumped out of my brain...

 

[mkast]

Re: oil cooler

Engine oil would suffer from cooling.

The top piston ring will expose the oil to 320 degrees F.
Wonder where that heat goes?

 

[PiratePast40]

Re: oil cooler

Many Volvo Penta AQ series setups used an engine oil cooler. In those units, VP recommended 10W30 oils.

Yep - My AQ130D has an oil cooler. I've believe that the AQ series 4 bangers and inline sixes with more than one carbureator all have oil coolers.