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Author Topic:   LOW OIL PRESSURE AT END OF STRAIGHT
IMCAMOD17
Member
posted August 28, 2002 10:19 PM
If the oil pressure drops as you lift off the throttle then the crank bearing clearance is too loose.


dode
Member
posted August 29, 2002 08:21 AM
What type of pump and pan are you using? You could be pumping all the oil out of the pan.

John

Dunbar
Member
posted August 29, 2002 12:26 PM
What kind of motor you running? I've never heard of anyone running 10w 30. Myself use kendall 50 weight. thats the best oil to put in a racing engine.


dirttrackracer
Member
posted August 30, 2002 09:01 AM
10/30 is a little thin for a race motor,but my guess is you are running a fram oil filter,get good oil filter and try again.


IMCAMOD17
Member
posted August 31, 2002 12:16 PM
When he hit the pan it may have broke the pickup loose? Was the pickup welded also? We had the pickup fall of a few times and it would do the same thing,was fine till you hit the track then it would drop. We put an extra quart in to finish the night then pulled the pan to find the pickup in the bottom.


IMCAMOD17
Member
posted September 02, 2002 11:24 AM
Run the 2050


SLEEPY GOMEZ
Member
posted September 21, 2002 12:49 PM
I don't think 10-30 oil is the problem. I have run 5w-30 with no problems (semi synthetic oil). Let me take a guess here. When you replaced engine parts did you get a new oil pump? They do wear. If you did it is also possible the new one has a weaker relief valve spring. Or it could have more clearance. Manufacturing tolerances are good but not perfect. Also your pump should be a Mellings hv55. They are sold under other brands but the casting carries the name.

One more thing, 20-50 oil takes more horsepower to pump through the engine. With the thicker oil you can get pressure to show on the gauge but you might not have enough oil flow. Oil flow is what cools the bearings.

These guys are right about the filter, trash the Fram. They can cause problems and Fram doesn't give a xxxxxx what happened to your engine! It cost me an engine to find out. Sometimes I learn slow but I learn good. I now own stock in Wix.

Hope some of this helps, SLEEPY

outlawstock17
Member
posted September 21, 2002 01:19 PM
i'm with you sleepy, i use mobil 1 in my race engine along with a mobil 1 filter. i also use an oil cooler. there's extra power in thinner oil. next time you change the oil in your truck, listen to the engine race before the oil pressure comes up. there's some high tech drag racing oil out there that is thinner than water. i wouldn't chance it in an oval car though.


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