Model A caster angle and set up?? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-11-2007, 02:04 PM
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Model A caster angle and set up??

We have a 28 ford. TCI frame, super Bell 4 in drop front axel, 4 bar setup.
all these parts are at least 20 years old. Everything has been rebushed, etc.
In the original setup, the caster came out at near zero. Adjusted the 4 bars to get about 3 degrees, but it took a lot of leverage to get it to go there. It is still twitchy and doesn't center itself at speed, like it should. Opinion seems to be that these front ends need 7 plus degrees of caster. My concern is, twisting the axel that much is going to put great stress on the front springs. (I understand later frames had caster built in to the front crossmember, but I don't think this one does). I assume I will have to pull the spring and put opposing tapered shims top and bottom to facilitate caster, while still clamping tight in the crossmember. Am I on the right track here? Can I buy those shims or do I have to make them? Anyone done this?
Henry Highrise, you out there?
don

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Old 04-11-2007, 02:21 PM
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I adjusted mine with my fourbar set up, but I also used a aftermarket crossmember. I used a panhard bar to stop the side to side movement of my front axle( this keeps the axle centered). I have not heard of using tapered spacers before. I just looked though my Speedway catalog and thought if spacers were available they would be in there...they weren't.
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Old 04-11-2007, 02:28 PM
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model A caster

Hello Henry, Hoped you'd be around.
I think I can get it with the 4 bars, but it took some grunt to get 3 degrees. It appears the crossmember spring mount is parallel to the frame and the caster angle is putting a twist on the springs. It seems that at some point it will be a problem. I can't get in there to check it, but wouldn't it be best to have the center spring hanger and the axel shackles parallel, not twisted?
BTW - How much caster are you running? Is your frame bought or built?
don
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Old 04-11-2007, 02:35 PM
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model a caster

Henry, just checked your photo album, looks like you welded in the crossmember. Did you put it square to the frame, or did you build some caster into it when you set it up? don
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Old 04-11-2007, 03:31 PM
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Don...I used the original model A frame ( boxed full length) but I replaced the crossmember with a aftermarket one. I think I got it from So-Cal , anyway I believe it had the surface where the spring mounts set at a slight angle. The cross member was a bolt in...but I also welded it.
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Old 04-11-2007, 05:42 PM
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model A caster

I've heard they build it in now. Guess I'm going to have to pull it apart and check it. How much caster are you running, and how does it track at speed?
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Old 04-11-2007, 06:01 PM
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Check these out





http://www.speedwaymotors.com/p/2080...g-Perches.html

Think that might help.

Mikey
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Old 04-11-2007, 07:24 PM
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There ya go...Mikey found you a solution...adjustable spring perches. I don't know how many degrees are on mine. I just got it close enough to drive and then I had a alignment shop align it. It drives good.
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Old 04-11-2007, 10:02 PM
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Mikey to the rescue!
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Old 04-11-2007, 10:56 PM
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I wished it could always be that easy, ......BUT!!, ... being as how those adjustable spring perches are kind of ugly on a fenderless car.....

I have made angled spacers also,
Any guy with a mill can make a pair up out of steel. Those are good lunch money jobs.. If you machine the shims more than 4 or 5 degrees and the spring will start to bind some in the crossmember.

I usually set the axles up at 6* and they seem to track ok.

Later, mikey
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