Oil Pressure

[wildman]

Ok, I have a remanufactured engine in my boat.<br />its a 5.7 350. 10 hours on it. The oil press is running near 3/4 gauge max to almost the max pressure when WOT. Is this ok for a reman engine?<br />The oil pump is brand new and I am running 30 weight oil. All advice is welcome.<br /><br />Thanks<br /><br />Wildman

 

[snapperbait]

Re: Oil Pressure

What is the max pressure on the gauge?<br /><br />Basicly a 350/5.7 engine absolutely needs 10psi of oil pressure for every 1000rpms... <br /><br />Example: 20-25psi on a engine at operating temperature at idle would be very good.. At WOT, say 4800rpm, 60 psi would be plenty comfortable..

 

[magster65]

Re: Oil Pressure

That's the rule of thumb we use for all the race-car engines too (which work almost as hard as a boat engine). Any more than that is a waste.

 

[wildman]

Re: Oil Pressure

Unfortunately the gauge is one of those with the super precise Low to High.... No PSI listed on it just an L and H... Any other thoughts..<br />I am just concerned that there may be too much if thats possible....<br /><br />Wildman

 

[Cobotr]

Re: Oil Pressure

The best way would be to hook up a real oil pressure gauge directly to the engine. This would eliminate any guesswork as to what the real pressures are.<br /><br />Chances are that with the new engine you may have gotten a new sending unit that is reading higher than the old one.<br /><br />Or the pump relief valve is set higher.<br /><br />Or the old engine had lower oil pressure and the current gauge did't read that high.<br /><br />Or any combination of the above. But the only way to know for sure is to connect a pressure gauge directly.

 

[magster65]

Re: Oil Pressure

I wouldn't trust anything that didn't have psi or kpa on it.

 

[wildman]

Re: Oil Pressure

ok then where is the sending unit on the motor so I can attach a gauge directly to it??<br /><br />THanks<br /><br />Tallman

 

[Doug Durako]

Re: Oil Pressure

I've got just over 100 hours on my 350 and it is running just a bit over what Snapperbait recommends.<br /><br />Just me, but I would rather be just a bit high on pressure as opposed to a bit low.

 

[Boatin Bob]

Re: Oil Pressure

WIldMan....should be on top of the block in the middle at the back, should look like a small tin can with a single wire. If you follow this link look at the picture and see # 66, thats the oil pressure sending unit. Blo wup of a 350 Crankcase

 

[wildman]

Re: Oil Pressure

Ok thanks for the info...<br />I just want to make sure I dont void my warranty or anything like that, I figured it would be high since its a new reman engine, but was not sure if that is good. Like I said on the average it runs about 3/4 gauge max to almost the "H" on the gauge when wide open.... I will see if I can get a manual gauge or something like that to test it out.<br /><br />Wildman

 

[wildman]

Re: Oil Pressure

ok so I hooked a mechanical gauge up to it..<br />I am running about 50-60 PSI at idle.....<br /><br />What are thoughts on this???<br /><br />Wildman

 

[Cobotr]

Re: Oil Pressure

Sounds high for idle, not that it's a problem. What is the pressure off idle, say at 2000 rpm?<br /><br />Is this 50-60 psi when cold?