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The polybronze and similar hard bushing may be smooth in their movement, but they do not isolate vibrations and impacts from the chassis. A good example are expansion joints in roads. When your tire hits a bad one that is sticking up, the wheel gets forced rearward while trying to move up and over the bump. The hard bushings have no compliance so that rearward component of the impact is transferred directly to the chassis as force and noise. A rubber bushing will absorbed some of that rearward impact and absorb some of the energy before it is transferred to the chassis.
More granular road noise is also transferred to the car by these bushings. Yes they can/do provide superior performance, but I feel for a road car the trade off in NVH is not worth it.
I had poly bronze on my backdated gulf blue turbo car. I have delrin and mono balls on my ‘69 ST. I put all rubber in my current ‘74 build, and when it’s done the ST will get rubber bushings too, even though I track that car most.
Last edited by rswannabe; 06-11-2022 at 01:34 PM..
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