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Author Topic:   Blinking oil light at end of straight
Dirt Full Roller

Total posts: 35
posted February 12, 2005 09:41 PM  
Alright ... from a sim game like NASCAR Tunder 4 from EA Sports, you find that by having the oil light blink just as you enter the turn tells you you've geared the car correctly. If it comes on sooner, you'd gear higher. If you never see it, you need to step it up and gear lower. All fun and games -- however, what about real life? My oil light blinks just before I hit the break. Is this good or bad?

[This message has been edited by kevinwardracing (edited February 12, 2005).]

Dirt Freak

Total posts: 217
posted February 12, 2005 09:53 PM  
had that happen after a pan change last year didn't cause any failures but sure gives a unsure feeling.

Dirt Forum Champ
Total posts: 5390
posted February 12, 2005 10:58 PM  
the rule of thumb is 10 psi per 1000 rpm.

Dirt Roller

Total posts: 25
posted February 13, 2005 06:25 PM  
This is a bad thing !!!! another thing to look at is ur block screened get rid of it and the plugs if ur valleys plugged. I know what the flashing light will do make it all go BOOM !!!!

Dirt Freak

Total posts: 318
posted February 13, 2005 07:15 PM  
that happened to use once, and it was the oil pick up feel off. and it took out some bearings

Dirt Maniac

Total posts: 170
posted February 16, 2005 02:47 PM  
i had an oil pickup that was loose and it swiveled causing loss of oil pressure and loss of bearings...crank...rods!!!

also had a cheap oil pan on another and the bottom sucked tight to the pickup...causing loss of pressure!

Dirt Roller

Total posts: 14
posted February 17, 2005 01:44 AM  
Racer17 and Modracer have pretty much spelled out your problem ! "pumping the pan dry" & "it's a bad thing".

When the oil light comes on at the end of each straight (assuming things are other wise good and constant), it means that the engine is pumping the bottom end dry of oil. Nothing else .

If that happens for even the shortest of moments, the crank bearings will begin to fail.

If there were a problem with the pump or pickup or whatever, the light wouldn't just come on at the end of the straight and the engine would have expired long ago.

You have a problem which is actually very common , very easy to cure, and almost always overlooked until the motor blows, at which point every stupid reason in the world is now the cause.

Lights come on when the oil is gone, so either ;

-be sure your pan is full.
-over fill your pan.
-get a bigger pan.
-change gearing.
-run restrictors.

Seriously, if you are pumping oil to the top end faster than gravity can push it back down, you need to reduce rpm, put restrictors in the block or run air bypass hoses from the bottom ,(advanced).

There is no mystery to this problem or the solution.

p.s. oil pickups should be 1/8 to 3/16 off the bottom of the pan.

Dirt Roller

Total posts: 23
posted February 18, 2005 09:25 PM  
Before you change out the pan, try running one quart less oil. Bet you see a diff.

Dirt Roller

Total posts: 14
posted February 19, 2005 01:39 AM  
If you run one less you'll see a difference all right!
When the pan is already being pumped dry, why on earth would anyone make it happen one quart faster ?

Donnie Ross
Dirt Freak

Total posts: 264
posted February 19, 2005 04:57 AM  
I believe what he is referring to is oil level over full causing aeration problems.

Dirt Roller

Total posts: 14
posted February 24, 2005 12:44 AM  
In theory you are right, an overfull pan could cause enough windage to foam oil to the point of pressure loss.
However, for a variety of reasons, it is probably unlikely.

- 'Oil light at end of straight'?

Not that big of a puzzle. Put oil restrictors in the block !!

Every racer goes through this when they start making more than backyard H.P.

Be proud. You're now pumping oil up , faster than gravity can push it down.

Dirt Roller

Total posts: 5
posted February 24, 2005 06:27 AM  
if your running on alot of bank the oil will climb up the side of the pan just as you enter the turn, i had this problem and there no way to stop this, thats why they run dry sump systems. i went to another track with less bank and didnt see the problem.

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