Bearing clearance and oil viscosity? - Page 2 - Chevelle Tech
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post #16 of 23 (permalink) Old Feb 7th, 19, 7:03 PM
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Re: Bearing clearance and oil viscosity?

Same here .0028 to .003 on bearings. 10-30 oil. Oil pressure is 30psi idle and 55 hot cruise with a HV pump. Always used a HV pump. With wide clearences and direct lube roller lifters. I dont see a issue with a HV pump.

64 Chevelle 496
64 F100 Street Rod with BBC /Chevy trapped in a ford body
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post #17 of 23 (permalink) Old Feb 7th, 19, 7:23 PM
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Re: Bearing clearance and oil viscosity?

Do you need to worry about BBC cam thrust block wear with a M77HV, high pressure spring, and heavy viscosity, or is that just a myth?
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post #18 of 23 (permalink) Old Feb 7th, 19, 8:00 PM
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Re: Bearing clearance and oil viscosity?

I say its myth in wearing the thrust surface. I say its myth it wears out the distributor gear. I say its myth it drains the pan dry. Getting off topic. So I will shutup.

64 Chevelle 496
64 F100 Street Rod with BBC /Chevy trapped in a ford body
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post #19 of 23 (permalink) Old Feb 8th, 19, 5:57 PM Thread Starter
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Re: Bearing clearance and oil viscosity?

Thank you everybody for your thoughts!
They make it easier to choose the way to go now.
I hope somebody else also will get use from this.

Long story short I used 15W40, Stock 50psi pump and .002 clearance a few years, bearings always looked good.
This is about the way I will keep on going.
So I think I will go about .0025 clearance and 10W30 oil.
And use a 60-70psi HV pump to be safe this time, although a stock pump with a 60psi spring should be enough.

I do not see any problems if somebody prefer to go the other route with big clearances and thick oil instead.
This is the way engines have been built forever.
The key is to use the right clearances with the right weight oil.
The thinnest oil that will make enough pressure in an engine is the right way to go in my opinion.
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post #20 of 23 (permalink) Old Feb 9th, 19, 10:55 AM
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Re: Bearing clearance and oil viscosity?

I have a customer who we did a 565 over 5 yrs ago for his Chevelle. Engine made 965 @ 7000 on the dyno and with some upgrades since then is probably closer to 1K hp. This car is a street car that gets driven almost every weekend as weather allows (he's in Maryland). He's been to the track several times and when he drives it, he drives the snot out of it. It hasn't been babied. He broke an inner valve spring last year and we put valve springs on it but that's all that has been done. Been in the car since new. Rod bearings were set at .0022-.0023 and mains .0027-.0028, standard volume pump with Driven 10-30 oil. I would have no problem with him running a 20wt oil. We will be going through the motor this fall and I'm anxious to see how everything looks.

FOXWELL MOTORSPORTS
Straub Technologies

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post #21 of 23 (permalink) Old Feb 9th, 19, 7:23 PM
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Re: Bearing clearance and oil viscosity?

Quote:
Originally Posted by steelcomp View Post
I have a customer who we did a 565 over 5 yrs ago for his Chevelle. Engine made 965 @ 7000 on the dyno and with some upgrades since then is probably closer to 1K hp. This car is a street car that gets driven almost every weekend as weather allows (he's in Maryland). He's been to the track several times and when he drives it, he drives the snot out of it. It hasn't been babied. He broke an inner valve spring last year and we put valve springs on it but that's all that has been done. Been in the car since new. Rod bearings were set at .0022-.0023 and mains .0027-.0028, standard volume pump with Driven 10-30 oil. I would have no problem with him running a 20wt oil. We will be going through the motor this fall and I'm anxious to see how everything looks.
Scott,
Just curious... Did you use the smaller 2.1” rod journals in this build?

67 SS BBC
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post #22 of 23 (permalink) Old Feb 10th, 19, 9:32 PM
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Re: Bearing clearance and oil viscosity?

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Originally Posted by bradley67 View Post
Scott,
Just curious... Did you use the smaller 2.1” rod journals in this build?
No, std. 2.20 rods.

FOXWELL MOTORSPORTS
Straub Technologies

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post #23 of 23 (permalink) Old Feb 11th, 19, 10:14 AM
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Re: Bearing clearance and oil viscosity?

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Originally Posted by steelcomp View Post
No, std. 2.20 rods.
Thx

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