Rod bearing sizes

[nullrout]

I've got a crank that a machine shop already turned .010 under on the rod bearings...does anybody know of like a .011 or .012 rod bearing so that I can have them fit them to my specs instead of gambling on a .010 bearing?

 

[turbofabricator]

I've got a crank that a machine shop already turned .010 under on the rod bearings...does anybody know of like a .011 or .012 rod bearing so that I can have them fit them to my specs instead of gambling on a .010 bearing?

Typical oversizes for the Buick V6 are: .001, .010, .020, .030" You CAN order custom oversizes. NOT cheap, though. Measure the journal and find out where it falls. If you have more than .0022" clearance, have it re-ground to .020. Tell the grinder that you NEED it to have a .0017" clearance.

 

[nullrout]

Will 20 over on the rods make the crank too weak?

 

[gossamer]

Will 20 over on the rods make the crank too weak?

No. The crankshaft in my engine now is .020 / .020 . It has a ton of street driving and has been 11.40 @ 118 at 21lbs. before I got kicked off the track for no roll bar. Run it :smile:

 

[Walt03]

Is the maximum clearance on the mains .022 also before regrinding to the next available oversize?

 

[turbofabricator]

Is the maximum clearance on the mains .022 also before regrinding to the next available oversize?

If you mean .0022", then that will work, but is REALLY loose. I shoot for .0017" For a race engine, .0022" is acceptable. Street car, NO.