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Old 10-03-2016, 10:06 AM   #19
Bored&Stroked
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Join Date: Jan 2011
Location: Central Ohio
Posts: 5,015
Default Re: Catastrophic crank failure.

I agree on the comments about the fillet/radius in the journal corners - there isn't hardly any to be seen. This creates a heck of a weak spot.

Just for comparison, here is the 4" Merc crank that I just put in my 284 cube 42 Merc engine last year - the crank has been offset ground/stroked to 4 1/8".

Notice the nice radius in the rod journal corners - something that I always have done (have a REALLY good crank grinder here in Ohio).

10-3-2016 11-02-51 AM.jpg
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