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Bumper Spring/Damper Capacity

Bumper Spring/Damper Capacity

Bumper Spring/Damper Capacity

(OP)
Anyone have any internet leads on where to go to find the energy necessary (spring constant, effectively) to permanently fully compress the rear bumper spring/damper assembly on a 1991 Chrysler LeBaron?  Not getting anything from the manufacturer.  I need to do some forensic engineering.

Mike McCann
McCann Engineering

RE: Bumper Spring/Damper Capacity

You should be able to find the required "no damage" impact speed that was in-force at the time somewhere here:
http://www.gpoaccess.gov/index.html

That would at least give you a "more than this" energy.

Beyond that, I suspect a trip to the junk yard to collect some test specimens is in order.

RE: Bumper Spring/Damper Capacity

I can't see a good way other than direct testing. Breaking stuff is always fun, and usually dangerous. As a rough idea, say 5 times the corner weight of the vehicle, at least.

Cheers

Greg Locock

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RE: Bumper Spring/Damper Capacity

old bumper dampers are often rusted solid. especially in michigan.

RE: Bumper Spring/Damper Capacity

The Ford units I've had to work on are filled with a goo that has some strange properties under pressure.  I don't believe they have a spring in them at all. Part of their functionality appears to be shearing a small weld, which allows the unit to collapse against the goo.

RE: Bumper Spring/Damper Capacity

Greg,
    You're thinking suspension. This is in the crash bumper...

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