Scions, another rebuild question; this time the crankshaft machining.
The machine shop I am using prefers to provide a full 180° degree undercut
on each side of the journal bearing, as opposed to a 90° degree fillet. It
is not a big undercut, probably less that 3/32 of an inch in diameter, but
it's different than what I expected.
Technically, in terms of stress risers or concentrators, it's a good method.
I just don't have the experience to know how it affects the bearing during
engine operation.
Anybody have any experience with full 180° degree undercuts on a crank.
Should this be avoided on a TR2-4 engine?
BTW - this machinist knows his stuff. He is highly regarded by local
mechanics and racers. He works on everything; European, American, Japanese
and diesel, but his eyes light up when you talk performance.
Thanks,
Jack
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