inspectorudy

Yes I wanted poly because it seems a good compromise between the solid and the rubber plus there is no way that is ever going to come apart like rubber.

68hemi

You are SO WRONG about this. It has become a well known fact in the last several years we were sold “a bill of goods” regarding these poly goods. They crumble like dirt after a short while compared rubber. About the only thing people today in the know use them for are sway bar bushings. Do a little research here on the forum and you will see what I mean.

inspectorudy

"Polyurethane also outlasts rubber when exposed to elements such as motor chemicals, road salt, or grime, all of which can break rubber down and accelerate wear. Energy Suspension's bushings are covered by a two year warranty, but here at DST we're so confident in these mounts that we offer a free upgrade to a lifetime warranty so these will be the last motor mounts you ever have to buy.

If you're looking for a way to decrease your off the line time at the track, but still want a comfortable commute these polyurethane mounts are a great option. Likewise if you're restoring an older model and plan on keeping it for the long haul, these mounts will last much longer than OE rubber. So, check out Energy Suspension's polyurethane motor mounts for an increase in performance that won't make everyday driving unpleasant."
This doesn't sound like a crumbling issue with this company that gives, for free, a lifetime warranty on its mounts. In their ad, they mention the cheap imports and how they do not last. You are making the same type of statement that is said about switching from points to a magnetic pickup ignition sys that they always fail and are not reliable. Things change.

68hemi

You may want to look at this thread as well as many others here on the forum.

https://www.corvetteforum.com/forums...iling-arm.html

jim lockwood

The rotational stress on trailing arms have little relationship to the stresses on motor mounts.

Apples and oranges.

Viet Nam Vett

I had a set of those red Poly mount motor mounts on the 502. Using block hugger headers from Sanderson. After XX years they MELTED...L.O.L. One day when changing oil I looked up and the Poly looked like a peanut butter squashed sandwich oozing out between the metal parts.....LMAO. Got me another set and used Engine Heat Reflecting 1/4 in thick tape and covered the new poly area's up. I'm good to go for some XX years....L.O.L.

They do melt...

inspectorudy

That was in 2018 and I would hope that if they were made in the USA that some corrections would have been made by now. I am going with these and expect to have them honor their warranty if the mounts fail. Just like Anchor and other "Made in America" brands that are junk, I expect that there are poly makers that produce junk as well. I'll let you know how it turns out.

inspectorudy

I talked to a guy at Energy Suspension and he told me that he had been there 9 years and never had one single claim for a failed mount. He also said that their polyurethane was made in the USA.

Viet Nam Vett

Maybe correct...but when you have a BB 502 with block hugger headers and side exhaust passing near the mounts ...it be hot down there ......the picture I posted ain't no lie...LMAO

inspectorudy

He did mention that they had some melted mounts due to headers not being wrapped but that is not a warranty issue. I wonder what rubber would have done in the same mount.

Viet Nam Vett

My Guess.?? They would also melt..Maybe Faster..BWTFDIK. Rubber does melt. The Problem is the collector pipe on my ride passes near buy the mount, Wrapping the header >>>>Not sure if that would help.

inspectorudy

I built a 427 Cobra and I used wrapping on the headers in areas that needed to be kept cooler. It worked fine. The only thing with wrapping is that the heat is going to pop up down the line and you have to make sure that it will be ok to get hotter in a new spot.

bad65

If you can avoid poly bushings and mounts, I would go with rubber. Never used poly engine mounts, but I had Energy Suspension rear spring mount bushings turn to dust in five years! Not as much heat there! Florida heat

Factoid

I’ve used Energy Suspension mounts on my cars with no issues. Yes, like most cushioning material, it is susceptible to heat. However, rubber is worse.