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Old 01-15-2019, 06:48 PM   #8
johnneilson
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Join Date: Jun 2010
Location: 34.22 N 118.36 W
Posts: 1,056
Default 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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