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Early 80's rear bumper rubber R & R. 200 1980

posted by  NewMexico240 on  Fri Dec 28 09:32 CST 2018
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last visit: Fri Oct 24 11:52 CST 2014
[RELATED]

Howdy, hope to find everyone doing well.

I have a new to me 1980 240.
The rear bumper rubber seems to have gunk under some of its lip. In those areas with this buildup underneath, it causes the edge (lip) to not lay flat. First thing odd is that gunk was able to get under that lip. The rubber seems to run on and be held on by metal rails?
Are the rubber sections removable?
Do they slide on & off?
Should I wait until summer when the rubber is more pliable? Is it possible to just clean gunk out of an area and the lip will squeeze back into its original location?

Thanks in advance.

Joseph in snowy & freezing New Mexico.







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    posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

    Can't help with any of my own experience, but can pass on a link to a current TB thread: http://forums.turbobricks.com/showthread.php?t=346573


    --
    Art Benstein near Baltimore

    Two peanuts walk into a bar, and one was a salted.



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      posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

      Remove 4 nuts each side to remove bumper. Then screws on the backside hold the rubber trim on.
      --
      82 242-6.2L; '17 Mazda3; '16 Crosstrek



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        posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

        Do as Michael Y suggests - but be prepared with and electric screw gun - you'll need a #2 philips head bit. -- Dave



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          posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

          Actually, I had to use an impact driver. And I got carried away -- the rubber never went back on.


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            posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

            Michael ~ but there is rubber on there?



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              posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

              ??? No rubber. In fact, no OEM bumper. I laid fiberglass up inside the aluminum....
              --
              82 242-6.2L; '17 Mazda3; '16 Crosstrek



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                posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

                "No rubber. In fact, no OEM bumper. I laid fiberglass up inside the aluminum."
                So you removed the rubber, filled in the holes with fiberglass and then painted the bumper black?

                And moved from "snowy & freezing New Mexico" to sunny North Carolina (license plate) all in a day?
                --
                1980 245 Canadian B21A with SU carb, M46 trans, 3:31 dif, in Brampton, Ont.



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                  posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

                  Laid up a completely new bumper using the inside of the Commando as a mold.

                  Never lived in NM. In fact, I've only visited it twice -- both times 20-25 years ago. Been living in NC since '06.



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                  posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

                  I'm pretty sure Michael Y meant he fabricated a bumper by using the inside of the original as a mold. Between the front and rear bumpers your talking about around 60 pounds -- that's 2 percent of the car weight - a nice reduction if your looking for performance (like adding almost 3 HP to the motor). -- Dave



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                    posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

                    I did the math! Hadn't really given it any thought until your comment. Simply calculated how much HP the engine would have to make to keep the Weight/HP ratio the same if I put the heavier bumpers back on. I figured a 50 lb. weight difference.

                    With me in the car - 3200 lbs. w/1/8 tank of fuel. 430HP. 3250 if I add the stock bumpers back. 3250/3200 x 430 = 436.7HP. So looks like 6-7HP.

                    Of course, since the engine doesn't actually make more power, trap speed/top speed largely unaffected. But for acceleration purposes.....we'll round it off to 5HP.



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                    posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

                    LOL! Yes, that's what I did. Was looking for a more attractive cosmetic solution to the big Commandos. Because these are laid up inside -- they're a bit smaller than the Commandos. And, of course, I was able to mount them much closer to the body.

                    Yes - useless as bumpers. Obviously, I'm ok with that.



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