96-98 Cobras and Spun bearings?

[DaveWertz]

What is it with these cars that you see them at low mileage spinning bearings out of the bottom ends? It blows my mind all the cobras in this era I see with low mile motors but all with spun bearings. Mine spun one at 66k, hence why its forged now but I still can't wrap my head around it. Is it a oiling issue?

 

[98 svt]

My OEM engine spun a bearing at 140k.
Then the new engine spun 2 bearings at 500 miles. Pretty sure the builder used the oil cooler from the original engine.

 

[01yellercobra]

Way back when I first got into 4V's there was a rash of spun bearings. Pretty much all were from being spun to 7K with the factory recommended 6 quarts of oil. It was discovered that the heads held a lot of oil. Between the timing chains pulling oil and the slow drain back of the normal oil it all stacked up. The fix was to run at least 7 quarts. Supposedly the later C heads had the drain back fixed, but I still run 7 quarts just in case. There's plenty of room in the pan so it doesn't hurt anything.

It might be the same issue with the earlier 4V's.

 

[DaveWertz]

Way back when I first got into 4V's there was a rash of spun bearings. Pretty much all were from being spun to 7K with the factory recommended 6 quarts of oil. It was discovered that the heads held a lot of oil. Between the timing chains pulling oil and the slow drain back of the normal oil it all stacked up. The fix was to run at least 7 quarts. Supposedly the later C heads had the drain back fixed, but I still run 7 quarts just in case. There's plenty of room in the pan so it doesn't hurt anything.

It might be the same issue with the earlier 4V's.

THats what I thought. I now run 7 quarts. Still fine tuning how to check it to make sure all 7 are on the dip stick. It just amazed me how many of these motors I see with spun bearings.

 

[SID297]

Way back when I first got into 4V's there was a rash of spun bearings. Pretty much all were from being spun to 7K with the factory recommended 6 quarts of oil. It was discovered that the heads held a lot of oil. Between the timing chains pulling oil and the slow drain back of the normal oil it all stacked up. The fix was to run at least 7 quarts. Supposedly the later C heads had the drain back fixed, but I still run 7 quarts just in case. There's plenty of room in the pan so it doesn't hurt anything.

It might be the same issue with the earlier 4V's.

Pretty much this. Makes for some good deals for guys looking for a winter project though.

 

[boost88]

So by reading this I should be running 7 qts in the cobra?

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[01yellercobra]

So by reading this I should be running 7 qts in the cobra?

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I would. It doesn't hurt anything and gives a little extra insurance for the engine. The way these blocks are set up the oil still won't be close to the crank.

 

[98 svt]

I used to run 6.5qts.
With the new MMR pan, my car holds 10 quarts.

 

[01yellercobra]

FWIW, the stock pan takes 9 quarts to reach the pan rail. Not that I'd ever run that much in my engine. Just something someone figured out a long time ago.

 

[boost88]

What weight oil.are you guys using? I don't have a manual with mine and lots of different suggestions on the internet

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[DaveWertz]

I am running 7 quarts as well of mobile-1 5w-30

What weight oil.are you guys using? I don't have a manual with mine and lots of different suggestions on the internet

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[SID297]

What weight oil.are you guys using? I don't have a manual with mine and lots of different suggestions on the internet

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At least a 30w, I tend to like the 40w flavored stuff though.

 

[boost88]

Does the 40 weight happen to help with the lash adjusters keeping them a bit quieter

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[Tunedprt91]

What weight oil.are you guys using? I don't have a manual with mine and lots of different suggestions on the internet

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Running 7 quarts of 5w-30.

 

[40th GT]

Has anyone compared warm idle oil pressure readings with 5w30 versus 5w40 or other viscosities? I'm curious now.

 

[ccq8le]

I run 5w-30 in my 96

7 quart's

Hardly drive it much tho....

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[98 Saleen Cobra]

AMSOIL Dominator 5w20 7qts and 8k rpm lol.

 

[9397SVTs]

8 qts Mobil 1 5W20

 

[DaveWertz]

8 qts Mobil 1 5W20

8? Curious as to why 8

 

[9397SVTs]

7 qt Canton pan and added plumbing for the twin turbo's and scavenge pump.