The Ford Barn - View Single Post

Kohnke Rebabbitting · 01-31-2020, 05:09 PM

If your running a true .001 or less, on set up, the bearing has no choice but to Smear the first .010 of babbitt, or less, and that is a waste. Normal Rod clearance of a broke in engine is .002, to .003 thousandths, depending how much heat you crate, running at higher speeds.

All our bearings, we set our clearance to, .001 per inch of shaft, and always then plus a half, .000-50. So a shaft of 2.500 would get .003 thousandths clearance. Never had any problems.

We use straight 30Wt. Summer, Straight .20Wt. winter.

5-30's, and the like, do not have enough cushion of oil molecule to keep shaft, and Babbitt separated, very thin oil film.

Herm

01-31-2020, 05:09 PM	#17
Kohnke Rebabbitting Senior Member Join Date: May 2010 Location: 60615,330th Ave.,Clare, Iowa, 50524 Posts: 1,457	Re: Bearing fit ... engine oil gravity feed If your running a true .001 or less, on set up, the bearing has no choice but to Smear the first .010 of babbitt, or less, and that is a waste. Normal Rod clearance of a broke in engine is .002, to .003 thousandths, depending how much heat you crate, running at higher speeds. All our bearings, we set our clearance to, .001 per inch of shaft, and always then plus a half, .000-50. So a shaft of 2.500 would get .003 thousandths clearance. Never had any problems. We use straight 30Wt. Summer, Straight .20Wt. winter. 5-30's, and the like, do not have enough cushion of oil molecule to keep shaft, and Babbitt separated, very thin oil film. Herm