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Crankshaft Stresses 101

Evo Engine / Turbo / Drivetrain - evolutionm.net - forums.evolutionm.net
Since there are problems with 4G63 crankshafts fracturing at oil port at #4, I thought I'd share my thoughts on the stresses in our crankshafts in hopes that we can find a way to prolong its life.

To start, I want to set my views up so we can all follow along discuss easier. When I talk about rotation, I am viewing the crank from the accessory pulley looking from passenger side to driver's side (other end is the flywheel). With this view, the crank rotates clockwise.

I also was to label each part of the crank starting with the front pulley area. We will label that part 0. Then where the rods connect, we will label that 1, 2, 3, and 4, corresponding to the cylinder number. And at the end where the flywheel is, let's label that 5. Here's a photo of what I'm talking about:


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