rod bearings

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aaronk785

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I'm looking at some King rod bearings. They say they're alecular alloy. Will these hold up in a 10 sec. bracket engine or should I spend the coin on some race type bearings. How do they compare to a Tri-metal bearing. Engine is 10.5 to 1 440 running pump gas.
 
I've heard there decent bearings for a stock replacement. If you have a high performance build I would order some Clevite bearings and never look back. 65'
 
I'm looking at some King rod bearings. They say they're alecular alloy. Will these hold up in a 10 sec. bracket engine or should I spend the coin on some race type bearings. How do they compare to a Tri-metal bearing. Engine is 10.5 to 1 440 running pump gas.
At an engine bearing round table at a PRI show the general recommendation was:
Steel Crank, tri metal bearings
Cast Crank, bi metal bearings
But either will work, the absolute biggest importance is get the clearance right.
 
I recently bought Speedpro main brgs for a 440. In the centre part of the shell, there is a 0.0005" variation side to side on some of them. Hmm. Made in Mexico. Hmm.
 
At an engine bearing round table at a PRI show the general recommendation was:
Steel Crank, tri metal bearings
Cast Crank, bi metal bearings
But either will work, the absolute biggest importance is get the clearance right.

Old rule of thumb, hard crank=soft bearing , soft crank=hard bearing -----------
 
At an engine bearing round table at a PRI show the general recommendation was:
Steel Crank, tri metal bearings
Cast Crank, bi metal bearings
But either will work, the absolute biggest importance is get the clearance right.

I had always heard for racing
4 speed, steel crank = babbitt bearing
Auto trans, steel crank = tri-metal bearings
 
I’ve used both. If you are beating on it the soft bearings will take more abuse, but they won’t take it for long. I was changing them out every 25-30 runs. With the hard bearings I could go 50-55 runs IF I didn’t make a mistake. A bit of dirt or cold oil and they would grab the crank. Any detonation would piss the hard bearing off.

If you keep oil to the rods any bearing will live.
 
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