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Originally Posted by GuidoK
Quote:
Originally Posted by Finnegan
Well let's see (hear)! I had hard (80 durometer) poly for awhile and it transformed my car into car tractor (sound wise). Interested!
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Are you sure they were shore80A?
Shore80A is usually the 'soft' polyurethane like the purple powerflex or red strongflex. Shore90A, shore95A or even stiffer is considered 'hard' (but nowhere near as hard as solid aluminium or Delrin).
But shore80A is usually stiffer than the stock rubber, expecially when thats already a few years old (thats then more like shore70a although there are various stiffnesses in a car)
I have shore80A as diffmounts and subframe mounts and have no whine etc what so ever. But I did choose shore80A over shore90A (which I put in most parts of the rest of my suspension) partly because of potential whine in those spots.
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Originally Posted by ANILE8
solid mounts actually reduce mechanical stress.
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Thats not possible from a technical pov imho. But that doesnt automatically means that solid mounts will cause problems. |
It was long ago so I could have the durometer wrong. The resulting resonance frequency was just unpleasant.