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Old 12-07-2009, 10:06 PM
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Triangulated 4 bar

My car is a 34 chevy street rod roadster shop frame that came with a triangulated 4 bar set up, Ive noticed the inside of the rear tires show some rubbing. The tire at its closest point is about 1 and ahalf inches away. I had a friend follow behind me going down the road and he noticed a little wobble every once and awhile he said it was hardly noticable Ive asked around about this and have all kinds of answers,from useing a diagnal link to changing it to parelle 4 bars and a panhard bar to useing a watts link,

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Old 12-07-2009, 10:14 PM
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Quote:
Originally Posted by Zipster
My car is a 34 chevy street rod roadster shop frame that came with a triangulated 4 bar set up, Ive noticed the inside of the rear tires show some rubbing. The tire at its closest point is about 1 and ahalf inches away. I had a friend follow behind me going down the road and he noticed a little wobble every once and awhile he said it was hardly noticable Ive asked around about this and have all kinds of answers,from useing a diagnal link to changing it to parelle 4 bars and a panhard bar to useing a watts link,

If the car is set up right.. You shouldn't need to go to a different set up.. The triangulated 4 bar set up right ,,work's good when its right..Did you make sure it isn't in the wheel ?? 1.5'' should be enough ... Make sure the wheel is not off one way on the hub.. Try jacking it up, And Run it in gear in see what the wheel is doing..
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Old 12-08-2009, 12:17 PM
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What is the tire rubbing on? It should be leaving a mark on the body or suspension somewhere.

Andy
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Old 12-08-2009, 12:54 PM
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I have a Roadster Shop frame on my 34 with the triangulated 4 bar and I have no issues with it.

Vince
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Old 12-08-2009, 08:36 PM
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Wheel Rubbing

Thanks to all that replied. This whole thing started when I was crawling around under the back end and I noticed a dark rub mark going around on the inside of both tires,I was perplexed at this as the car runs smooth at 70+mph. I had a thought just now I wonder if the tires or sidewalls swell outward as speed increases they are firestones big round sidewalls 8.20 or something with wide whites,just thinking the tires should grow taller not outward...oh well. I was reading today that triangulated bars if not set at 45 deg the rear will walk. well thanks for the imput I am going to run it in gear with the tires off the ground and see what it does,I'll keep you all posted to my progress, thanks again,
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Old 12-08-2009, 10:44 PM
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Zipster, before you run that car up on stands, take a look at the inner fender wells etc, and see what the tires are rubbing on. If the rear axle is moving laterally, you will need to side load the suspension to make the problem apparent. That is not something you can safely do while it is up on stands with the wheels spinning. Radial tires by design are very stable dimensionally, they don't grow in height much even if overinflated, and lateral movement in the sidewalls will be minor as well if properly inflated.

Andy
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Old 12-08-2009, 10:58 PM
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Zipster.. When I said to put it on stands... It was mainly to see what the wheels are doing.. Not to see what the suspension is doing..You won't be able to put a side load that way.. But you may be able to eliminate the wheels..
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Old 12-10-2009, 07:16 PM
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Triangulated 4 Bar

Thanks Guys, I understand, I looked again and found a spot on the frame where the tires are rubbing and am taking it to a guy that does chassis work, i'll keep you informed as to the out come, thanks again for all the great ideas and help,
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Old 12-10-2009, 08:01 PM
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The tires on the rear of my Nova will rub on the shock absorber casing from a little more than 3/4" away just due to cornering forces making the tire "lean" on the rim. This is with new leaf springs and polyurethane bushings. The taller the tire, the more it will lean over on the rim during cornering.
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