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Old 11-24-2010, 06:53 PM
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Default What bearing clearance and oil?

Strip only, less than 500hp, simple build.... What kind of bearing clearance do I want and what weight oil should I use. I always see guys say to use the weight oil that is for your clearance. Is there a chart for clearance vs. oil?
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Old 11-24-2010, 08:08 PM
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I like .0025-.003" clearance on the looser side of that for strictly racing purpose and I have always used Valvoline VR-1 20w50 Racing oil. You will probably get a wide range of answers.
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Old 11-24-2010, 08:28 PM
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I like to get mine between .0015-.002 and i use rotella 15-40, i have tryed different oil in the car on the chassis dyno with no real measureable differences. My main thought is to protect the motor, not try and squeeze 2 more HP out of a 600HP combo with light weight oil. I like oil that clings to things, the lighter weight oils seem to run right off of stuff like it wasnt there. JUST MY 0.02$
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Old 11-24-2010, 08:46 PM
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I thought maybe I was needing around .0025-.003, I need to get the crank turned and hopefully this time it will be loose, the last time two rods were around .0005, didn't last long, and this time I'm checking the clearance. I just didn't know if that loose needed 20/50 or if 10/30(or 40) would work. Thanks!
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Old 11-24-2010, 09:39 PM
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Quote:
Originally Posted by bigblok86ranger View Post
I like .0025-.003" clearance on the looser side of that for strictly racing purpose and I have always used Valvoline VR-1 20w50 Racing oil. You will probably get a wide range of answers.
X2 on the clearances
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Old 11-25-2010, 10:42 AM
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My motors have all been in the specs I have listed and I have run 10w40 in them with no noticeable drop in oil pressure. My current engine was .0029-.003" on all journals rods and mains and holds 65psi warm and will go up to 90 with rpms. My last 466 was assembled with .00275" on rods and mains and after 7 years of beating the crap out of it still held 55psi warm at idle and 90 at 6500rpm's.

But like I kinda hinted to earlier every engine builder will have a tolerance that they feel is the best, and tons of different opinions on oil.

My reasoning on using Valvoline is on my first rebuilt engine I tried several brands of oil (all with FL1A filter) and every single one except Valvoline would drop 10psi of oil pressure after I had 1000 miles on the oil and I didn't care for that. That was 13 years ago and there are some different oils available now but I just stick with what works for me.
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Last edited by bigblok86ranger; 11-25-2010 at 10:48 AM.
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Old 11-25-2010, 02:07 PM
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my clearances are .0025-.003 and i'm running rotella 15w40-holds 60psi cold but when it warms up it's 20-25 at idle 45 cruising,seems kinda low to me
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Old 11-25-2010, 08:34 PM
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Thanks everyone, all replies seem pretty close. I might use 10-40 while it's still cold, and then switch to 20-50 when it hits 100 degrees here, like in Feb!
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Old 11-26-2010, 03:38 AM
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Default good question!

I have 460 with 500 HP street configuration.

I run 20W50 on 0.0035 clearance on main bearings and standard Melling Oil pump. Cold pressure was 60 PSI and warm pressure was 37 PSI > 2000 RPM.

Yesterday i took crankshaft out of engine, bearings are damaged. Looks like not enough oil, in the middle of the bearings lead is gone.

my opinion is until 500 HP a clearance of 0.0020 and 20W50 grade with hot weather will keep the crank healty.

what do you think?

greetings from the Netherlands
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Old 11-26-2010, 10:18 AM
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Quote:
Originally Posted by Johnny Torino View Post
I have 460 with 500 HP street configuration.

I run 20W50 on 0.0035 clearance on main bearings and standard Melling Oil pump. Cold pressure was 60 PSI and warm pressure was 37 PSI > 2000 RPM.

Yesterday i took crankshaft out of engine, bearings are damaged. Looks like not enough oil, in the middle of the bearings lead is gone.

my opinion is until 500 HP a clearance of 0.0020 and 20W50 grade with hot weather will keep the crank healty.

what do you think?

greetings from the Netherlands
Greetings.

I think your combo shows what happens when you don't have the correct combination of parts. While it is commonly done having .0035 clearances on the mains, it is usually not done for a street engine and especially with a standard volume oil pump. As you have discovered, if you run large clearances, you need a lot of oil. Just reduce your clearances to .003 and run a HV oil pump, and you'll be fine.

On a related subject, individuals have to realize that you can run tighter clearances, and thinner oil, but the component selection, machining and bearing set-up is going to be more expensive. Having .003 clearances allows the components a little "movement" factor and the thick oil takes up the extra clearances.

Hope that helps,

Dave
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