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Author Topic:   oil pressure
Pigpen
Member
posted July 08, 2002 10:08 PM
I am losing oil pressure when the motor is put under a load... it has 60 lbs. at idle and it is fine when you rev up the motor, But when I take the car for a lap on our test track the oil pressure will drop to zero. I pulled the motor and all the bearings are good... and the clearance from the pickup and the pan was 3/8 inch. It has a stock oil pump and stock oil pan.... I am going to change the pump since I have it out...just want to see if anyone knows what is wrong...


BayouGent
Member
posted July 09, 2002 03:54 AM
Did you try a different gauge before pulling the pan? Replacing the pump is a good idea, but this is an unusual scenario. Check your oil pressure line for a kink and see how you have run. Something might be hitting against it and pinching it off giving you the zero reading. Any engine I've ever seen lose oil pressure to zero has NEVER just found it again without me tearing it apart. But there again that could be just my luck.


Pigpen
Member
posted July 09, 2002 09:48 AM
I am going to put the motor back in today.. and if the problem is still there I will try a new gauge... I cut open the oil filter and there was nothing in it... kind of makes me feel like I am working on this backwards...Thanks


dirtbuster
Member
posted July 09, 2002 10:55 AM
When you say load is that in a corner or under straight acceleration?

With a stock pan you caould be starving the pickup of oil especially in a corner but even under a straight line acceleration.

What happens is all of the oil either gets thrown to the back or to the side of the pan and uncovers the pickup tube. But once you stop accelerating or turning then the oil returns and you have oil preussure again. This is also why when the car is not moving you have no problem, the oil is just sitting in the bottom of the pan no being thrown around.

That is why they make circle track oil pans with one way gates in them to keep oil around the pickup and not let it get thrown around inside the pan.

BayouGent
Member
posted July 10, 2002 12:36 AM
We've run some pure stock cars with stock pans and pickups on 1/4 mile and 3/8 mile tracks without a problem. We do run circle track pans in the faster classes though. What class and what make of engine are you running Pigpen? If you're running something like street or hobby stock you might want to get the circle track pan like dirtbuster is talking about to stop that oil from sloshing around so much. If you are running in the slower classes you might want to make sure the rules allow a circle track pan before bolting one on.


Pigpen
Member
posted July 10, 2002 10:15 AM
The car is for a train race... I normally run a super stock with an accusump... but this car has to be stock.. that was my first thought( the pan) I thought the pickup must be set wrong... I have run street stocks in the past with stock pans with no problem... and this car does not accelerate or corner very fast so it would be hard to belive that is it... but I replaced the pan with one I used on my old street stock... I am still confused.....thanks for the help. www.dancermotorsports.com


Pigpen
Member
posted July 11, 2002 09:28 AM
Well I got the motor in the car and after priming the oil pump I was trying to put the distributor in, but it just would not seat.. I looked down the hole and saw something in there... when I finally got it out it was an rtv cap.. and I had not even used any rtv so it did not just happen... well the oil pressure is just fine now, not sure if that was it but I did not really find anything else.... thanks for the help everyone...


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