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Old 10-29-2012, 06:57 PM
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Model A replacing the FRONT leaf with coilovers!

I would like to upgrade the handling on my Model A aftermarket tube axle. I plan to remove the front leaf, and install adjustable coil-over shocks. My current plan is to reverse the perch bolt and use a 5/8" x 6" bolt through the inverted perch to support the shock bottom. Any thoughts on the strength of this perch tube? The front end weights 1150lbs. (See the picture mock-up) Better ideas welcome!
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Old 10-29-2012, 07:16 PM
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I wouldn't trust the perch to support the entire weight, be more inclined to weld a dedicated mount to the tube axle.

Have you thought about using a different leaf type? I have a mono leaf on my '27 RPU, and a front sway bar. It rides and handles great.





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Old 10-30-2012, 09:42 AM
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Ditto! Two bolts in single-shear holding the entire weight or the car's front end will not work for long...

Russ
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Old 10-30-2012, 10:51 AM
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I'll give that mono spring some thought. As for the perch bolt, I will go back the drawing board. Although a.5/8 bolt will hold.on sh!;ear strength the barrel end. being only 1/8 thick. may crack. Maybe an under lying bracket that uses the perch bolt hole and an additional u-bolt around the axel. Welding to the axel sounds dangerous. I am not sure it is as tough as a rear axel housing as it is designed to bend for camber adjustments. I will post my next idea....Thank you!
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Old 11-04-2012, 01:39 PM
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With the coilovers you'll need to use a panhard bar to locate the axle side to side.
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Old 11-05-2012, 09:06 AM
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Yes, the pan hard bar is must. I was looking at the one that bolts to the bat wing and welds to the frame on the opposing side. It is available online and at Speedway. Reasonably priced too.
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Old 11-05-2012, 08:00 PM
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Quote:
Originally Posted by Fe Block View Post
Yes, the pan hard bar is must. I was looking at the one that bolts to the bat wing and welds to the frame on the opposing side. It is available online and at Speedway. Reasonably priced too.
The photos above that I posted of my '27 has that style of panhard bar.

A small panhard bar is fine for a buggy sprung car, the leaf spring itself limits most of the side to side movement, the panhard bar just minimizes shackle swing.

But for your coil over set-up you will want something a bit beefier, and with no leaf spring in the front crossmember there should be plenty of room for a bigger one.

Just my thoughts.... fwiw
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Old 11-06-2012, 06:59 PM
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This pics shows my idea of using 1/4" angle iron incorporating the perch bolt but adding two grade 5 u-bolts. The 7/8 x 5/8 bushing will be welded to the angle iron and hold a 5/8 bolt. Once the bushing is welded, it will be cut to length. The 1 1/2" length shown is a bit too long. I anticipate 3/4" length after welded. I will need to weld v-blocks on the bracket which will cradle the bottom of the axle. I will also remove unwanted steel to make it look cleaner. It may be a bit bulky,but welding a bracket to the small 2" axle doesn't seems a good idea. An I-beam axle may work better for welding.
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