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69 AMX coil spring dilemma

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farna View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Apr/29/2019 at 6:56am
Old thread, but...

The different springs for each side of the car might have had something to do with road crown, but I doubt it. Theory does sound good, but it was mostly due to loading of the car. All accessory components were heavier back then. What side the 40-50# battery was on made a difference. Easy to see the with and without AC springs -- the AC compressor added weight to one side, as well as other AC components. Most cars will sit level with an average weight driver (160 or so #?) in the driver's seat. My best guess is that's how they were balanced from the factory. May or may not have been some compensation for road crown also.

AMC printed the spring wire diameter, rates, and loaded/unloaded height info in TSMs through 69. After that they deleted that info, probably as irrelevant to servicing the vehicle. Coil Spring Specialties (www.coilspring.com) has all the factory spring specs, but I don't know if they will give them out.

Rates changed after 1969 due to the change in spring geometry between trunnion and ball joint cars. Moving the lower spring pivot/mount inboard a couple inches to clear the upper ball joint (rather than directly above the trunnion) meant that the spring rate had to be increased to get the same bounce and ride height over a 69 and prior spring. The longer the lever, the easier it is to move something. Moving the spring makes for a shorter lever out from the body, so it takes a bit more effort to move the same weight from the tire, hence a heavier spring.
Frank Swygert
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