Looking at poly-urethane engine mounts. Anyone try them ? Any thoughts or opinions would be greatly appreciated. Thanks......sabre67
Over the years I have done a bunch of cars with them.can be more harsh than rubber mounts.
What I've been what I've been told is don't mix and match the solid and the rubber. You WILL break something. And it's not just going to be a motor mount it's going to be something that's going to ruin your day and probably the next few weeks after that..How smoothly does you motor run? How much do you drive your car? How much vibration are you willing to put up with? What are you getting in exchange for this? I use poly bushings for my sway bar and some suspension bushings but never where vibration would be transmitted to the frame.
I have been told by my racing buddies never to use poly or solid motor mounts and poly or solid trans mount on an aluminum case transmission...
I've seen motors with rubber jump around and Shake more than what mine does with Polly but then again the bottom end was done by an Army Aviation mechanic, he worked on helicopters and he had a 10-second Street drivable Dart! He had a Stash of 340s, Boy Lemme tell Ya!I think extra vibes come from the engine balance, as in was you engine rebuilt and balanced, stock or rbuilt with out balancing. Motors I've rebuilt that were all balanced didn't vibrate much more with Poly than stock with rubber. Again, durometer will dictate the vibration outcome.
I Would! You definitely do not want to use steel motor mounts on the engine and put a rubber mount on the transmission that's a big time no no! Now don't quote This is Gospel but I think you may be able to use a steel motor mount on the driver's torque side and use rubber on the passenger side and the transmission but I don't know for sure I seen remember and I remember saying he had success with thatSo if i go poly on motor ,then match it with poly on the727 right?