varkwso

My car has started to spike oil temps quickly. With my oil cooler I used to never see above 250 but now it is hitting 270-280 in a couple laps.

Does not consume a lot of oil on a track weekend and I am not getting much in the catch can. Water temps are 221 or so. \\

The cats checked out, the Tech II said I had fuel and spark and I could pass emissions. Diagnostics showed nothing and we checked everything. All I have is a idle that hunts from 600-800 rpm and motor, power wise, that feels like it is running on 6 cylinders.

Leakdown and compression checked out a few months ago. It has a forged bottom end and maybe 5000 gentle track miles on it.

Heat in oil comes from friction and/or combustion gases in crankcase in my experience.


Any thoughts?

sothpaw2

Only thought would be to have oil analyzed and maybe section the filter too. Might be worth doing the leakdown test again. Is the pressure good?

varkwso

Pressure stays strong.

Sidney004

What weight is the oil?

db2xpert

As a shot, try blowing compressed air through the cooler from the rear.
The 6 cyls says something is not right, check your plugs?

diddiyo

quoted from another thread:

sperkins

Check your pushrods. They're worth 4 tenths each.

rfn026

I'm with Sidney on this one. What is the weight of the oil? The weight of the oil makes a real difference in oil temps. I got a significant drop in temps once I went to a 5W-30.

btw - My latest Vintage Motorsport column (which I haven't posted on my web site yet) deals with engine coatings. Coatings are a huge deal in F1 and NASCAR. When you're looking for those last 5 bhp you're going to get involved in coatings.

Richard Newton
Newton's Law in Vintage Motorsport Magazine

varkwso

Oil is 15-50 and has been all along. Will check pushrods. I saw your example!

Piston were coated.

Falcon

Jeffro, as someone earlier wrote, clean out the cooler fins. You'll probably have to dismount it so you can get in behind it real easily, but I'd eliminate that first as the problem.

varkwso

I think the real problem is the block, crank and rods belonged to you at one time...

Falcon

Oh, that's that engine......:o

It's Toby's fault, he transported it!

vette6aut0x

Where are your coolers located?

RAFTRACER

If it is down on power noticeably and not from really high ambients temperatures and spiking oil temperatures like that, I would be cutting the oil filter apart and making sure that nothing bad is about to happen.....

varkwso

Right side of radiator.

I cut up last filter and it was not bad. I will cut this one this week.

I have run it at 6 events this year and they were all high rpm tracks. Same tracks as when it ran cooler except little tally.

C&M Racing

Tech-II passed and did not show engine missing which I think is P300.
Car is not missing but feels low on power.
Oil temps increasing.

First thing I would do is pull spark plugs and use a torque wrench to see how hard the engine is to turn over. I am sure others can give you a ball park of how much drag is in a good moter. If drag is up look at bottom end. I record drag when engine is built and can compare with later test.

Basic increased oil temps means more friction. This assumes nothing else has changed in the cooling system and coolers are not dirty.

Superbee

I've had a few race motors do that before letting go, cause was badly worn crank bearings each time.

vette6aut0x

Send the oil off to be analyzed and cut the filter open.

CP Thunder

If the car is living at high RPM ......... a dyno pull will tell you if you are down on power. Ours was down 35hp........freshened the heads and back to 390rwhp we went. Its all about the valve springs........

vette6aut0x

That still doesn't address his higher than what he has been seeing oil temps.


"My car has started to spike oil temps quickly. With my oil cooler I used to never see above 250 but now it is hitting 270-280 in a couple laps."