Re: counterbalanced crankshaft
No dog in this hunt, just a couple observations;
The "A" crank journal sizes are not up to spec for a Hot motor, definitely not a competition motor. Cross drilling the crank to oil the rods makes the situation even worst, you are removing up to about 9% of the cross section on a journal that is too small already.
Personally not seen a broken Burlington crank, after seeing one up close I declined to attempt for a customer's hot motor. I have seen the aftermath of two broken SCAT cranks, they were stroked with "A" rod throw diameters and cross drilled. Both broke along the oiling hole on the #4 rod.
It really depends on the application and the loose nut behind the steering wheel.
J
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As Carroll Smith wrote; All Failures are Human in Origin.
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