Visit The Dirt Forum for More Information

Author Topic:   Low Oil pressure.. sorry so long..
Pigpen
Member
posted May 14, 2004 08:00 PM
This is the third time I have had this problem... I will run the car for a few weeks and then the oil pressure will drop to 20 psi. when you rev the motor it will drop lower. I replaced the oil pump the first time and it worked for a few weeks, sent it back to the machine shop, they replaced the oil pump(after checking everything) and it worked for a few weeks, the gauge has been replaced. Well it happed again this week so I decided to run it anyway... car runs perfect not a miss just wont get above 20 psi. My engine builder says the hyd. lifter would start making noise if I really was running 20 psi at 6000 rpm.. what do you guys think, there is never any bearing issues... the only thing I can think to try this time is the oil pan.. the one on the motor is aftermarket and the pickup tube screen has very large holes, I am thinking maybe it is picking up dirt and making the relief spring stick??????? help please...


Racer111
Member
posted May 14, 2004 08:06 PM
Check your cam bearings.


Racer111
Member
posted May 14, 2004 08:08 PM
Also if your using Kendall oil get rid of it and buy a different oil.


Pigpen
Member
posted May 14, 2004 10:44 PM
the cam bearings were checked ath the machine shop... I can change the oil pump and run 2 or three races and it comes back... it would seem like it has to be some sort of issue with the pumps? I run valvoline 50 wt racing oil....


racer17j
Member
posted May 14, 2004 10:59 PM
are you sure your tube to your gauge just isn't getting pinched off


xx RACER 96
Member
posted May 15, 2004 01:17 AM
If the distributor is pushing down on the oil pump shaft too hard it will do what you are describing,check that the dist is not pushed down with the hold down clamp too hard...just back off the bolt and if the dist pops up much at all that's what knocking out the pumps.


juliaferrell
Member
posted May 15, 2004 08:50 PM
Do you have a System One oil filter? If you do I had one that was collapsing. I scratched my head for 3 motors trying to figure it out. I put the last brand new engine together with everything new (block and head) and was determined to have pressure. Got lucky and when we fired the engine for break in it ran 4 or 5 minutes and oil pressure dropped to 20 or so. Kept scratching my head and took the system one *$100* junk oil filter off and screwed on a 3.45 wix and PROBLEM SOLVED!!!!!!!



juliaferrell
Member
posted May 15, 2004 08:52 PM
Needless to say they know my name personally at that organization in CALLY!!!!!! *I sent them the filter they dynoed the thing said it was no good rebuilt it and sent it back. I tossed it right in the can!!!!!!!!!!!!!! They didn't want to hear about the 15000 or so lost in engine components.


Racer111
Member
posted May 16, 2004 08:36 AM
How often do you change your oil?


rrrrick
Member
posted May 17, 2004 02:19 PM
Sounds like an oil filter problem to me. We ran the off the shelf oil filters from most parts stores and would sometimes have that problem. Change the oil filter and the problem goes away for awhile. An engine builder told me if you are buying a $5.00 filter you aren't spending enough.



dirtbuster
Member
posted May 17, 2004 02:52 PM
How often do you change oil filters? Run a good filter like a wix racing filter and see what happens. Change it every other race night.

If you have dirt big enough to make the pump bypass stick you have bigger problems. Not saying the spring cant get stuck but thats not liekly the cause.

hamer36
Member
posted May 17, 2004 06:51 PM
check your filter boss to see if they plugged the oil filter relief valve. If they did then the filter is the problem. Mine is plugged and I know when to change because the pressure drops from 60 to 40 to 35. AC PH35 is all I've ever used(long ). I think they're now #1218


Pigpen
Member
posted May 19, 2004 07:15 PM
I change my oil every other week, I use the ac 1218 filter... I checked the oil pump to distributor clearance... seems ok nothing moves, I even left the dist. in and when I pulled the pan you could still move the shaft up and down. When I pulled the pan the pump screen had alot of stuff on.. just like last time...last time it was alot of cork gasket, so when I replaced the pan last time I used the fiber one peice gasket... which was what is on the screen... I can not see where it is coming from the gasket still looks complete. thanks for all the replys...now someone has to figure this out I am running out of ideas????


Pigpen
Member
posted May 19, 2004 07:17 PM
oh yea... forgot.. I run the braided steel oil pressure line... besides I never Have a problem when I am running the back-up motor...only this one...I have even gotton so desperate to change the oil and filter after the heat race when the problem occured...thanks


dirtbuster
Member
posted May 19, 2004 08:52 PM
If it is a long stroke crank W/ long rods and the block has been clearanced your crank or rods may be brushing the gasket and slowly wearing it down putting the cork or fibers into the oil system.


xx RACER 96
Member
posted May 20, 2004 02:21 AM
it is a stock crank with 5.7 rods...


juliaferrell
Member
posted May 20, 2004 03:52 PM
I would replace the little softplug back at the rear main. Could be leaking when the motor gets warm.


fast_crew
Member
posted May 20, 2004 04:19 PM
even a stock crank and rods will hit the pan gasket. usually the rear counter wieght hits.


Josh K.


Back to the Archives