Oil flow is what provides the cushion, not weight... There isn't enough difference between those two oils for the engine to see a difference....also i have a 3/16 gap between the flexplate and converter i had about 30 all motor passes and about 20 aborted nitrous passes while we were trying to get the chassis figured out, had rotella 15-40 in it but before the last outing switched to 10-30 vr1 im thinking the thicker oil was giving just enough cushion to keep this from happining
I'd be willing to bet that if the crank were moving that much, the motor would be pretty fucked at that point. Maybe it was fucked, hence the reason for the video, but I'm gonna guess that most of that movement was the flex plate. Thats what they are designed to do.Hard to dispute video proof. Thanks. My current car is a pipe rack so I can see right in there. I have never watched it close from underneath like the video but I have watched my balancer up close on the brake and off at 7300 stall or free rev to 9000 and never saw it move perceptibly. The flex plate and balancer are swimming all over in the video. I wonder how much of that is just the flex plate flexing rather than the crank actually moving.
Next time I'm get a chance I will GoPro my balancer going through the motions and will see if it is indeed sliding in and out of the block like the slide on a trombone.