The Ford Barn

Ol' Ron · 12-04-2015, 05:39 PM

Ya gota work with the math, The diameter of the crank subtracted from the bore of the rod and tne thickness of the bearing times two, If the numbers add up and the clearance is right. THEN start fitting them. Also you must check for width , especially in the filit radius of the crank. You don;t want to hang up there. I like .015 on the width of the bearing, this lets the oil out of the bearing. Next the rod side clearance should be .008-.010" on a street engine and .015-.020 on a track engine. This allowa plenty of oil flow through the bearing to cool it. But the added clearance makes the rings work harder, but the excess oil on the bottom of the pistons keeps them cool.

12-04-2015, 05:39 PM	#17
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,985	Re: Reconditioned 37 rods Ya gota work with the math, The diameter of the crank subtracted from the bore of the rod and tne thickness of the bearing times two, If the numbers add up and the clearance is right. THEN start fitting them. Also you must check for width , especially in the filit radius of the crank. You don;t want to hang up there. I like .015 on the width of the bearing, this lets the oil out of the bearing. Next the rod side clearance should be .008-.010" on a street engine and .015-.020 on a track engine. This allowa plenty of oil flow through the bearing to cool it. But the added clearance makes the rings work harder, but the excess oil on the bottom of the pistons keeps them cool.