When To Upgrade Wrist Pins
The wrist pin is charged with the daunting task of snatching the piston back from the brink of disaster hundreds of times per second in the face of massive cylinder pressure and alternating loading that can approach 400 g’s. Under these conditions, the pin can bend and distort into an egg shape even if it is well lubricated. The worst case occurs when the piston reverses direction at the top of the exhaust stroke. There is little or no cylinder pressure to cushion the reversal, so the pin bears the full weight of ......