The Ford Barn - View Single Post - The Terry Burtz 5 main bearing engine blocks are back on track.

40 Deluxe · 08-31-2021, 03:52 PM

[QUOTE=Terry Burtz, Calif

The "New Model A Engine" is closer to 2000 technology than it is to 1920's technology, and home builders need to work with engine builders familiar with new engines.

There have been a few cases where home builders and engine builders familiar with 1920's technology don't understand modern insert bearings and the bores that they fit into.

The bores are circular, and the modern inserts are spread at the parting line. Before assembly, the inserts protrude above the parting line, and when assembled, the inserts become flush with the parting line and become circular with the equivalent of a press fit.

The bearing tabs are for locating and are not used to keep the insert from spinning in the bore.

Please don't remove material from the parting plane of the inserts, fail to follow the "Builders Guide" regarding stud clearance, or shim bearing caps because you think that the line boring bar machined oval holes.
[/QUOTE]

Wow! It's hard to believe that any engine builder does not know about bearing crush! This is about as basic as it gets, and insert bearings have been around far longer than any current engine builder. Makes one wonder what else they bugger up!

08-31-2021, 03:52 PM	#402
40 Deluxe Senior Member Join Date: May 2010 Location: now Kuna, Idaho Posts: 3,779	Re: The Terry Burtz 5 main bearing engine blocks are back on track. [QUOTE=Terry Burtz, Calif The "New Model A Engine" is closer to 2000 technology than it is to 1920's technology, and home builders need to work with engine builders familiar with new engines. There have been a few cases where home builders and engine builders familiar with 1920's technology don't understand modern insert bearings and the bores that they fit into. The bores are circular, and the modern inserts are spread at the parting line. Before assembly, the inserts protrude above the parting line, and when assembled, the inserts become flush with the parting line and become circular with the equivalent of a press fit. The bearing tabs are for locating and are not used to keep the insert from spinning in the bore. Please don't remove material from the parting plane of the inserts, fail to follow the "Builders Guide" regarding stud clearance, or shim bearing caps because you think that the line boring bar machined oval holes. [/QUOTE] Wow! It's hard to believe that any engine builder does not know about bearing crush! This is about as basic as it gets, and insert bearings have been around far longer than any current engine builder. Makes one wonder what else they bugger up!