Re: How much overbore?

Posted by Jack Vines On 2010/12/19 0:29:50

FWIW, the Chevy V8s never had main bearing or crankshaft problems until they went to overdrive automatics and lockup torque converters. This increased engine loading at lower RPMs caused heretofore unseen wear. The Ultramatic was probably the second automatic transmission with a lockup clutch. Given the weight of Packards and the generally high gearing, it is possible the same thing is occurring.

There are so few standard shift Packard V8s, it is difficult to use them as a control group.

My first investigation is to have an expert in balance and harmonic dynamics look at the crankshaft and put one on a balance dynomometer.

jack vines