Quote:
Originally Posted by 8500RPM
The way he worded his questions points to the general belief that a centri supercharger on this motor tugs on the crank through the belt at a sideways angle. That in turn causes main bearing #1 to take extra abuse when supercharged with a centri.
From what I've read the PD blower like Harrop doesn't cause such strain on the 1st main bearing. I feel a PD blowers potential engine damage affects the rods themselves more than anything.
Centri blowers make peak torque much higher in the rev range than a PD blower. That means the rods take less abuse in the lower revs where they are most vulnerable. PD blowers make a lot of torque down low so that puts much more stress on the rods. S65 rods are prone to bending over the 400tq mark at the wheels.
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Thanks so much you clarified and explained what I was looking for.