The Ford Barn - View Single Post - Engine in my 1929 tudor sounds like it knocks

Kohnke Rebabbitting · 12-21-2019, 06:33 PM

One thing most Guys don't think about.

If a Model A runs mostly at 45 miles an hour, the crank will expand at least, .002.

If run mostly at 60 M.P. H., the crank will expand at least another .001 to .001-50.

A Model T with a 1 1/4, on mains and rods, as a norm will be running with .003 to .003-25 thousandths clearance.

It would be much less, as we know, with an oil pump.

So, the bottom line is, the engine running at 45, will have a greater oil clearance, then when running 60, in the same engine.

So a Babbitt job that hasn't been peened, or peened incorrectly, don't stand much of a chance, as the crank will peen it for you, and they do an awfully poor job of it.

Herm.

12-21-2019, 06:33 PM	#17
Kohnke Rebabbitting Senior Member Join Date: May 2010 Location: 60615,330th Ave.,Clare, Iowa, 50524 Posts: 1,457	Re: Engine in my 1929 tudor sounds like it knocks One thing most Guys don't think about. If a Model A runs mostly at 45 miles an hour, the crank will expand at least, .002. If run mostly at 60 M.P. H., the crank will expand at least another .001 to .001-50. A Model T with a 1 1/4, on mains and rods, as a norm will be running with .003 to .003-25 thousandths clearance. It would be much less, as we know, with an oil pump. So, the bottom line is, the engine running at 45, will have a greater oil clearance, then when running 60, in the same engine. So a Babbitt job that hasn't been peened, or peened incorrectly, don't stand much of a chance, as the crank will peen it for you, and they do an awfully poor job of it. Herm.