What is normal oil preesure???

[95 GT]

I have a dilemma. I put a used 5.0 and T-5 into my car. I drove it easy for a couple days and all was well. But the Oil Press would start out about 60 PSI. The last engine, which was a low mileage racing motor was pretty steady @ about 39-45 PSI. This one starts @ 60 and when it's all heated up drops down to as low as 25 @ idle. So I finally "get on er" and within a mile I implode the Throw out bearing. I spent a week changing out the tranny, get it back on the road and it's got the telltale blue smoke coming aout the tailpipe. Not a lot, but it doesn't ever go away completelly, and when I stomp on it it's pretty bad for the folks behind me. Are these related? Could I have just blown out a valve stem seal or are we talking rings? Any advice would be appreciated because I'm gonna start tearing into it tonight. Sorry for the long thread.
Matt.

 

[RYC CUKR]

In my experience valve stem seals usually smoke on start up but it clears up after that. I would run a compression check at minimum and if you can a leak down test as well. Then you can have a good idea of where the problem actually lies instead of guess and possibly throwing parts at it, which can be a very expensive proposition.

And I usually like to see a minimum of 10 psi of OP for each 1000 rpm. At idle I would still like to see at least 25 but after that at least 10 psi for each 1000 rpm.

 

[95 GT]

So if I have 62 PSI @ idle, then I have a problem? I have changed the oil twice and the filter once since I installed the engine.

 

[Strype]

Your oil pressure will drop after the car warms up. Mine goes from 55 down to 23 at idle after warming up.

 

[SuperStang83]

And I usually like to see a minimum of 10 psi of OP for each 1000 rpm. At idle I would still like to see at least 25 but after that at least 10 psi for each 1000 rpm.

That is the general rule of thumb that I always hear. My oil pressure is around 25psi when it warms up, and about 55psi at the most when I get on it. I worry that mine is to low too.

 

[ninety15.0]

I seem to remember hearing that Ford specs a mimum hot oil pressure of 10psi....or some rediculous number. Maybe try running a thicker oil if you are concerned with you oil pressure. 25psi at hot idle seems perfectly fine to me. I run about 30-33 at hot idle and about 55-60 at WOT high rpm. Im assuming you have a good gauge.

 

[RYC CUKR]

So if I have 62 PSI @ idle, then I have a problem? I have changed the oil twice and the filter once since I installed the engine.

Is this cold idle or hot idle. My cold idle OP is around 50-55 psi when it warms up it drops down to around 30 psi.

 

[94_Teal_GT]

My Haynes manual says 40 to 60 psi at 2000RPM with engine hot for the 94-95 5.0L. No spec at idle is listed.

Mine has about 55-60psi when cold and about 35-38psi when hot at idle. My engine has about 200k miles on it.