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Author Topic:   oil psi ?? please
Dirt Freak

Total posts: 284
posted October 16, 2005 08:02 PM  
Ran new motor Sat. Oil psi strong 80 lbs. Everything fine durign the heat race. By feature it had dropped to 60 lbs cold. But steady. All was well until about 2 laps to go in feature and then the oil psi light came on and I saw I had low oil psi.
Finished the race and went to pits. Never saw any oil/smoke from breathers or headers during race and water temp was good.

Got out of car look for oil leaks quickly found none, started car back up and had between 40 and 60 psi ??

Any clues as to what is going on. I will pull pan and look at bearings, obviously but anyone have suggestions as to whats going on, motor is 355 with high volume pump and high psi spring, 7 quart claimer pan.

THanks !!!

Dirt Full Roller

Total posts: 38
posted October 16, 2005 09:22 PM  
What kind of oil are you running? You might want to try a heavier weight and see if that helps.
Are you sure that the oil level is right?--too low and you cavitate the pump--too high and your crank counterweights could mix it up with the air in the crankcase and put little air bubbles in it. Either way it could result in loss of oil pressure.
Was oil level same after it cooled down as it was before you started?
There may be other potential causes-- but I'd rule out all the easy stuff first.
Personally, I'm not a fan of the high volume pumps--I think they **** --more than you need.

Dirt Freak

Total posts: 303
posted October 16, 2005 10:50 PM  
what kind of oil filter?personally,I would replace it and see if pressure returns,seen it many times on a new engine.

Dirt Freak

Total posts: 284
posted October 17, 2005 06:45 AM  
Admitally the filter is not a top notch one and I can change that easily, and see what happens.

The oil was 20 W 50 Valvoline which I have ran before and not had this kind of problem.

Thanks for the suggestions it seems weird how the oil pressure was almost gone and then I fire it up in the pits and its ok.

I could understand if I had let it cool down, but I fired it up again quickly after getting in the pits. Does this sound like a loose pickup maybe ? By the way the track is high banked and long....

Dirt Forum Champ
Total posts: 755
posted October 17, 2005 06:58 AM  
I've had one do that before and it ended up being a pickup tube that fell off. Welding them on cures that problem.

Dirt Full Roller

Total posts: 55
posted October 17, 2005 07:45 AM  
I stay away from the HV pumps. At our high RPM you can pump too much oil into the top of the motor. I use a Melling M55A pump, with the pickup tube tack welded on. Have never had a problem and always have 50-6o lbs hot or cold.

Dirt Freak

Total posts: 238
posted October 17, 2005 11:33 AM  
Is this the first time running a new engine? If so, could be the Moly assembly lube plugging the filter, if it hasn't been changed after break-in. Dave

Dirt Freak

Total posts: 209
posted October 17, 2005 02:16 PM  
sounds like a pickup or sump baffle problem.

Dirt Freak

Total posts: 303
posted October 17, 2005 03:05 PM  
Change the oil filter and see what happens,seriously,have seen it many times.

Dirt Forum Champ
Total posts: 715
posted October 17, 2005 03:18 PM  
Oil filter like he said.Seen it many times myself.

James Ott
Dirt Maniac

Total posts: 131
posted October 17, 2005 05:15 PM  
Quit running ****py filters...try an Amsoil filter. They have a built in bypass which allows oil to flow if the filter gets plugged, or if the oil is cold. These filters have superior cleaning ability so if the filter goes into bypass it will pass "clean" unfiltered oil

Dirt Freak

Total posts: 284
posted October 17, 2005 09:38 PM  
problem found thanks to all, rock or dirt clod hit bottom of pan right by pickup, pulled pan and will fix, thanks for all the suggestions and I will also switch to a better filter.

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