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Old 07-22-2004, 11:20 AM
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Main Bearings

Ok it's opinion time...

On a non-cross drilled crank. What main bearings do you run, or have you run with good results

1/2 groove
3/4 groove
full groove

Application is a big block mopar, with factory steel crank.

Keith

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Last edited by k-star; 07-22-2004 at 11:29 AM.
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Old 07-22-2004, 12:48 PM
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How many RPM? Power? Intended use? How bout reliabilty? Is it a concern?

Normall I run the full groove bearings to reduce friction loss. But they don't seems to last as long.
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Old 07-22-2004, 12:57 PM
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6800/7000 ish, should be in the 625 to 650 hp range. drag with some limited street time. It will probably get freshined every year.

keith
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Old 07-22-2004, 02:16 PM
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Keith,
3/4". That comes from a couple of customers that fool with the Chryslers and hold a few NHRA records.

Chris
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Old 07-22-2004, 02:38 PM
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The Federal Mogul 3/4 groove mains seem to work quite well; they negate the need (if any) to cross-drill the crank.

tom

johnsongrass1, fully groove mains have a severely compromised bearing film from the groove in the bottom half. That's why they don't last as long and why I don't use them unless they are the only thing available for a given engine.
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Old 07-22-2004, 04:41 PM
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bearings

Thanks Tom and Chris,
I was leaning to the 3/4 groove but i read in a chrysler builders book that they suggest full groove. I am with tom i don't like the fact that i am going to loose aproximently 1/4 of my load bearing surface with a full groove bearing. But i do understand the importance of feeding those large rod journals with plenty of oil. So i was thinking the 3/4 would be a "best of both worlds" situtation..

Keith
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