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1975 Plastic fantastic aka Corvette

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  • That vehicle was beat on a bit.
    I'm still learning

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    • Originally posted by Bob Holmes View Post
      That vehicle was beat on a bit.
      it will look fondly back to those days when I'm done with it....

      but the frame isn't cracked, it hasn't been wrecked, and there's no rust in the frame...

      next up is poly bushings and figure out why this thing is wandering (beside the nose-high springs)
      Last edited by SuperBuickGuy; July 8, 2012, 07:08 PM.
      Doing it all wrong since 1966

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      • If you're really going to beat on it, I'd suggest Delrin (really, you should go with rod ends). We squished a set of polies in 12 track weekends. In a Miata!!!
        I'm still learning

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        • delrin isn't cheap - how much would I hate aluminum bushings?
          Doing it all wrong since 1966

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          • If its only track driven, you'll probably really like them. If you intend to drive it on the street, not so much.
            I'm still learning

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            • http://www.ebay.com/itm/ACETRON-ACET...item4cef051c22

              acetal / delrin is pretty cheap this way, so is aluminum. Del/Alum ala Global West I believe? They're both soft and easily machined.
              Last edited by Beagle; July 9, 2012, 05:43 AM.
              Flying south, with a flock of bird dogs.

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              • knowing its derivative term "acetal" helped me find a supplier in Seattle.... thanks

                The supplier charges $8.00 a foot....
                Doing it all wrong since 1966

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                • I am told, by a guy that should know, that UHMW would make the best bushing material. I just can't find anyone that has bushings made out of it. Of course, I should just make my own.
                  I'm still learning

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                  • Originally posted by Bob Holmes View Post
                    I am told, by a guy that should know, that UHMW would make the best bushing material. I just can't find anyone that has bushings made out of it. Of course, I should just make my own.
                    sounds like a challenge and test.... I'll buy some and post up what happens.
                    Doing it all wrong since 1966

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                    • Do you have a lathe to build your own bushings? That would be flippin sweet.
                      There's always something new to learn.

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                      • Originally posted by milner351 View Post
                        Do you have a lathe to build your own bushings? That would be flippin sweet.
                        I do... 12x36 grizzly (see prior posts about buying this beastie)

                        and I found this.... interesting stuff
                        from USPlastics.com

                        What is the difference between the Acetron GP and Delrin?
                        The Acetron GP is a copolymer acetal. This general purpose acetal is the only porosity free acetal product available. This allows it to provide the performance and machinability of acetal without the center core porosity.
                        The DuPont Delrin is a homopolymer acetal. It has slightly better mechanical properties then the Acetron GP acetal but may contain a low-density center, especially in larger cross sections.

                        So that means that Delrin is for Miatas?
                        Last edited by SuperBuickGuy; July 9, 2012, 10:09 AM.
                        Doing it all wrong since 1966

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                        • Sounds to me like I need to get you the dimensions of the spring eye bushings and some $ for material and shipping ;-)
                          There's always something new to learn.

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                          • Originally posted by milner351 View Post
                            Sounds to me like I need to get you the dimensions of the spring eye bushings and some $ for material and shipping ;-)
                            I ordered the UHMW, so I should have plenty

                            One thing to keep in mind, the Corvette has no suspension parts that move in 2 planes, so using solid bushings isn't a problem - that could be a real problem for the Falcon because, beside vertical compliance, the spring has to twist too. Since you have such short springs, putting solid or relatively solid bushings may not be optimal.

                            Interstateplastics.com was cheaper by a bunch for UHMW
                            Last edited by SuperBuickGuy; July 9, 2012, 10:54 AM.
                            Doing it all wrong since 1966

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                            • Delrin is a trade name.

                              It'll be interesting to see if you can machine the UHMW. My understanding is that it is a bit gummy.
                              I'm still learning

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                              • Originally posted by Bob Holmes View Post
                                Delrin is a trade name.

                                It'll be interesting to see if you can machine the UHMW. My understanding is that it is a bit gummy.
                                as is acetal

                                I asked my dad about using UHMW for bushings, he thinks its a good idea - and he's been machining it for ages. The only issue he brought up is the 180 degree temperature limit - the underside of the car does get pretty warm, and many bushings are near exhaust.... it melts at 273. What he said is it gets gummy at 180 then eventually cracks.... but it takes years to get there (he uses it for a myriad of things, but in this case it was on a commercial dishwasher as a door guide - they cycle to 180*). Also, on one of the sites it said to be sure a keep your material at less then 73* to avoid problems with machining - I wonder if what you said is the problem they're implying?

                                Also, there are different types of UHMW, one is more brittle then the other - and you can get specialty mixes like oil impregnated
                                Last edited by SuperBuickGuy; July 9, 2012, 10:04 PM.
                                Doing it all wrong since 1966

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