Quote:
Originally Posted by Croustibat
ACL "tri metal" race bearings (and others) always make me laugh. Oem ones already are tri metal.
Bearings are not black magic anyway.
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Depends on the manufacturer. Some engines come standard with aluminum bearings that like to soak up gunk better than a tri-metal bearing. This can be good and bad. Clevite makes a lot of this type of bearing.
I agree bearings are not black magic.
Quote:
Originally Posted by Mikester
So... In other words, in a car that will see daily driving as well as track duty, exact tolerances would be best... and for say, a drag car that makes big power for short stints, and undergoes frequent teardowns/rebuilds; maybe the tolerances wouldn't be so critical. Is that correct?
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Not really. Clearances are
always important. It's important to match your clearances with what the car will be doing and what materials are in your engine. An aluminum rod engine is going to have different clearances than a steel rod one, and a drag racing, big power engine is going to have different clearances than a street one of the same build. They also change based on what your oiling system can handle.
Here at Force, we use ACL race bearings in all of our 6-bolt 4G63's, and they always mic out great (no we don't measure clearance with plasti-gauge, that's a joke). We use Clevite H or P bearings is most of our other builds.
But like it says in the original article, clearances are MUCH more important than what the bearing is made out of. Another often overlooked measurement is rod side clearance.