I currently have poly strut mounts and am not thrilled with the extra nvh it adds. It's not a huge amount, but noticeable. My question is, are there any rubber mounts that come close to poly for longevity?
eagleknight97
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I've bought some SuperPro Polyelast's, but it'll be a few weeks before they get into the car. They're essentially the same hardness, and feel just like the same material.
When I get the other mounts off, I'd be able to tell for sure what the differences are if any.
When I get the other mounts off, I'd be able to tell for sure what the differences are if any.
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I was referring to the stock mount style versus the PolyElasts.... I'm not blind. 
But perhaps I didn't clearly specify.
But perhaps I didn't clearly specify.
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hehe I was just giving ya some grief.
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Polyelast is essentially a polymer synthesized from polyurethane and elastomeric rubber. I did some reading, and it essentially is meant to act like rubber and resist breakdown and deformation like poly. There are lots of variations, so I didn't dig that deep into the actual composition.... as if that matters LOL.
Since here in NC I've only had one set of mounts fail, I would posit that the chemical exposure in certain areas leads to advanced wear. I'd say rock salt from areas that use it would be the best known culprit.
Like GXP25 said... it's a wear item like brakes, tires, etc.... Not much you can do but replace them when they go.
Since here in NC I've only had one set of mounts fail, I would posit that the chemical exposure in certain areas leads to advanced wear. I'd say rock salt from areas that use it would be the best known culprit.
Like GXP25 said... it's a wear item like brakes, tires, etc.... Not much you can do but replace them when they go.
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Actually, Polyelast is a thermoplastic as well.... As far as the properties of each, I wouldn't read the marketing brochure to discover what the difference really is. You have to look at the actual engineering bulletins on each material....
Were the marketing brochure's to be believed, everybody has the best part available.
Edit... P.S. for the record, I can't really find the appropriate EB since there are so many variations of PolyElast that I don't know which one to pick.... aside from asking for that EB from the manufacturers using it (if they'll provided)
Were the marketing brochure's to be believed, everybody has the best part available.
Edit... P.S. for the record, I can't really find the appropriate EB since there are so many variations of PolyElast that I don't know which one to pick.... aside from asking for that EB from the manufacturers using it (if they'll provided)
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The Polyelasts are good quality parts, but I didn't like the bearings. I reused the bearings I had (inspected them thoroughly) since they had only been in the car for about a year.
It might have been just me. Anyhow, overall the quality and feel aren't going to be identifiable different.
It might have been just me. Anyhow, overall the quality and feel aren't going to be identifiable different.
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It wasn't the size of the bearings. Mostly, it was the overall perceived quality of them. They were not smooth in operation and didn't handle compression well.
The mounts are as good as can be expected.
We'll see how they measure up in longevity. Any mount will eventually wear out, but I expect these to never have to be replaced again (or at least not in a reasonable amount of time) given the amount of driving I intend to do going forward with the G8. 4-6k driving a year means these should last a good long time.
The mounts are as good as can be expected.
We'll see how they measure up in longevity. Any mount will eventually wear out, but I expect these to never have to be replaced again (or at least not in a reasonable amount of time) given the amount of driving I intend to do going forward with the G8. 4-6k driving a year means these should last a good long time.
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The chemical reliability will only really be important to folks who live and drive in climates that consistently use rock salt.
Here in NC, I have learned that rubber holds up very well.
As far as road comfort, the front end responds about as expected after installing the Super Pro control arms and radius rods. It's harsher than before, but not to such an extent that it is noticeable at normal speeds. So, I would say that the mounts are indeed comparable to rubber as far as road feel is concerned.
Do they "deflect less?" Considering the hardness of the original stock mounts, not really. It isn't like the OEM stuff was flimsy.... After completing an entire bushing job, I can honestly say the mounts have had an impact that is indiscernible.
I bought them more as an experiment, so I'd not say I wouldn't buy them again. Come back in 7 years and I'll tell ya LOL....
Here in NC, I have learned that rubber holds up very well.
As far as road comfort, the front end responds about as expected after installing the Super Pro control arms and radius rods. It's harsher than before, but not to such an extent that it is noticeable at normal speeds. So, I would say that the mounts are indeed comparable to rubber as far as road feel is concerned.
Do they "deflect less?" Considering the hardness of the original stock mounts, not really. It isn't like the OEM stuff was flimsy.... After completing an entire bushing job, I can honestly say the mounts have had an impact that is indiscernible.
I bought them more as an experiment, so I'd not say I wouldn't buy them again. Come back in 7 years and I'll tell ya LOL....
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I know.... I meant to say "I can't say..."
Largely, it is an experiment. I have yet to really be able to fairly rule on them.
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A long while ago, I got into a debate with an engineer. We were talking about Micron Gauges, and he insisted that I had my terminology wrong when describing an aspect of the sensor. He was insistent in his correctness, and I yielded.
He came back to me and apologized and he said, "Mike, stick to your guns. You shouldn't yield just because you think the guy next to you has more experience or that he is smarter than you. You were right."
I learned to stick to my guns, and I'm doing it now.
I followed the installation procedures correctly for the bearing installation, and I verified it twice. These two bearings were the only ones to have ever failed on me during that procedure, period.
Consider it what you want, but sometimes there are other reasons problems arise than just somebody's error.
That said, we're good, I'm not mad. However, I am opinionated, and this time I am sure.
He came back to me and apologized and he said, "Mike, stick to your guns. You shouldn't yield just because you think the guy next to you has more experience or that he is smarter than you. You were right."
I learned to stick to my guns, and I'm doing it now.
I followed the installation procedures correctly for the bearing installation, and I verified it twice. These two bearings were the only ones to have ever failed on me during that procedure, period.
Consider it what you want, but sometimes there are other reasons problems arise than just somebody's error.
That said, we're good, I'm not mad. However, I am opinionated, and this time I am sure.
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That said, I am 100% willing to entertain the idea that I simply got a defective set of bearings. Still, it was my experience, and I was sharing it.
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