Quote:
Originally Posted by DeliveryValve
... I think you need to find a hydro mount that will take the weight of the 617. Your talking around a 600 lbs om617 vs a 400 lbs LS3. ...
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Seemed the opposite problem. The Corvette mounts didn't deflect noticeably under the engine weight, and seemed much stiffer than M-B ones when I played with them on my shop press. I think the natural frequency comments are the best explanation, and validius post seems spot-on since it was a low frequency that seemed to shake the whole body. One can't hear 12.5 Hz, but you would hear the harmonics and sounds from parts impacting. No loss, I have other old cars I might try them on someday.
I once generated a similar vibration at idle. In securing my 1984 300D's detached-at-top K-frame, I ran a heavy chain axially back to the tranny cross-over. That chain vibrated at idle and shook the whole body at a similar low frequency that was very annoying. I stopped it by jamming some big sponges between it and the tranny.