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Old 05-19-2009, 05:15 AM
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length in a 4 bar application

i have seen discussions concerning short 4 link applications....most are for rear end applications.....my question concerns front end setups...whats the longest 4 link anyone has seen or run in terms of tubing length,tube dia.,wall thickness,material,etc........input appreciated

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Old 05-19-2009, 09:27 AM
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hard to say without knowing the app.

most front end 4 links ive used were 3/4" DOM tubing. usually around 36" long...

there is no limit on how long the bars can be...

the longer the bars, the less your caster will change upon suspension flex.
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Old 05-19-2009, 11:14 AM
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application is 4 link with parallel quarter elliptic springs.....links are 42'' long....1" o.d .250 wall 6061 t6.....aluminum tube.....5/8's heim joints.....assembly is complete chassis-wise motor[454] is not yet installed.....big concern however about 4 link flex,both under accelleration but more so under brake torque..........input appreciated
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Old 05-19-2009, 07:34 PM
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The upper links operate in tension and carry most of the axle torque load so length is immaterial in that aspect. Your springs are going to act as locators for the bottom so lower links are neither necessary or desirable. In fact, the lower links would have an excessive compression and tension load thrown into them as the springs go through their arc of motion. MPO Use bones instead of hairpin or links.
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