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Thread: Any Feedback on body mounts? Rubber or Poly?

  1. #1
    Registered Member JT56's Avatar
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    Any Feedback on body mounts? Rubber or Poly?

    Guys looking to change out my body mounts. Anybody have real experience with both? Pros and Cons.

    Thank you
    Joey

  2. #2
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    It's a mine field on this call. Not sure there's a clear answer.

    I've had too many problems with polyurethane bushings and other parts just disintegrating, some never loaded or used. Quality is all over the map on pu. (I've also worked with pu in industry and it's fine if molded correctly, but a lot of parts are pour molded, and the results can be most anything.) On the other hand I've seen some limited reports of the same thing happening to the Danchuk rubber mounts.

    I'd go with the rubber mounts myself, thinking the chances are better.

  3. #3
    Registered Member chevynut's Avatar
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    I went with poly mounts on my Nomad. I have no experience with them but I know rubber ones will flatten over time. I think that's less of a problem with poly, but I'm not sure.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension

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  4. #4
    Moderator NickP's Avatar
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    Quote Originally Posted by Rick_L View Post
    It's a mine field on this call. Not sure there's a clear answer.

    I've had too many problems with polyurethane bushings and other parts just disintegrating, some never loaded or used. Quality is all over the map on pu. (I've also worked with pu in industry and it's fine if molded correctly, but a lot of parts are pour molded, and the results can be most anything.) On the other hand I've seen some limited reports of the same thing happening to the Danchuk rubber mounts.

    I'd go with the rubber mounts myself, thinking the chances are better.
    Recently, I have found that the major players/suppliers have change formulation on PU parts. I'm not saying they're better than the old stuff but some seems to be softer or something compared to old parts.

  5. #5
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    That's one of the problems with the pu, the consistency over time of new parts. The suppliers of pour mold polyurethane often don't maintain control over their product. It puts the people that actually make parts at their mercy. We fought this over and over in the industrial stuff I worked with. On the other hand, injection molded pu is very consistent in its properties and processing. But I'm thinking body mounts aren't injection molded. For one thing the tooling costs a lot more, and this is a big deal for small quantity manufacturing. Injection molded polyurethane also requires proper drying, it is more sensitive to moisture than most plastics that are molded.
    Last edited by Rick_L; 05-02-2018 at 08:30 PM.

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    I have had good luck with Energy products so far but have`nt logged tens of thousand of miles yet on them.

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    I use rubber on most applications, with the exception of a drag car and I went to aluminum.

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    My friends 55 chevy has rubber mounts and I have poly. His mounts are only two years old and are falling apart.

    I can with out doubt say the ride is stiffer in my car using poly, but I like that. I'm sure poly will last much longer then the rubber junk made today.

  9. #9
    Moderator NickP's Avatar
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    Quote Originally Posted by DocHarley View Post
    My friends 55 chevy has rubber mounts and I have poly. His mounts are only two years old and are falling apart.

    I can with out doubt say the ride is stiffer in my car using poly, but I like that. I'm sure poly will last much longer then the rubber junk made today.
    I know this about some rubber replacement parts, like the PU, the quality is either perfect or rotten - no in-between.

  10. #10
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    That's why I said it was a mine field in my initial post.

    I had the link bushings for a sway bar fail while just sitting there, installed but never used. I've had a Stanley dead blow hammer just disintegrate. I've had shoe soles disintegrate. All PU.

    But rubber can be just as troublesome. Had a deal where we were trying to mold rubber parts at my work. Inconsistency kept us from releasing a product for a couple of years. Not for a lack of trying or getting assistance from suppliers. We finally spent a bunch of money to be able to do more of the process in house.

    Trouble with either is that the guy that molds the parts is often not in 100% control of the situation, at the mercy of material suppliers.

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