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Old 04-28-2009, 09:20 AM
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Need a tech article on rear coilovers model A

Hopefully, someone can steer me to a good article that will explain how coilovers are measured, how they work to replace existing suspensions etc; We're working on a 28 Sedan that had a small airbag under each side. 4 link system already in place. But, the car rode like an empty dump truck and was too high in the back. So, my buddy cut everything out, installed a pair of coilovers that he got at the Louisville show and, it still drives like a truck. (Too stiff in the rear) but, it is lower. Thanks, Don

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Old 04-28-2009, 03:21 PM
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Most coil overs have a weight rating. 200 / 250 / 300 and so on. You may need a lighter set of springs. But be forewarned ... with the 103 inch wheelbase ... most Model A's do not ride as well as the later Fords. In 1932 Ford went to 106 inches and in 1933 ... he went to 112 inch wheelbase ... because the longer wheelbases RIDE BETTER ...

I prefer coil springs over coil overs



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Old 04-28-2009, 03:50 PM
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Duece, what spring rate do you use? I've got a friend with an A coupe(no fenders or bumpers) and 200Lb coilovers (TCI recommended) and it rides like a lumber truck in the rear. It actually hops over bumps. Rear shocks show maybe 3/8" of suspension travel. My racing info says based on rear weight a 90lb spring or maybe less would be correct.
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Old 04-28-2009, 06:58 PM
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Quote:
Originally Posted by ericnova72
Deuce, what spring rate do you use? I've got a friend with an A coupe(no fenders or bumpers)
I do not use them ... PERIOD ...

I use coilsprings out of GM vehicles ... the ones in my photo under my 32 full fender coupe are Vega ... my coupe and a Vega weigh about the same ... and my coupe rides pretty nice ( for a light, short wheelbase car )





It is easy to get the car to sit RIGHT also ...
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Old 04-28-2009, 07:11 PM
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Quote:
Originally Posted by Deuce
I prefer coil springs over coil overs
Can you explain to me what the difference it makes if the spring is 'over' a shock or stands alone? Does it matter if the shock is inside the sping instead of being mounted seperately?
But yeah, go with a light spring. Seems like the parts houses, like Summit etc always says to use a heavy spring, no matter if it's for the street or drag racing.
Btw, nice looking setup!
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Old 04-28-2009, 08:59 PM
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Duece, was just hoping you might know the rate of the spring you were using, just for comparisons sake. My race Vega has 85 pounders so maybe I'm on a possible right track to helping him with his '31.
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Old 04-28-2009, 09:53 PM
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Also take a look see at the shock valving as a very stiff shock will have an effect on the ride..probably some 85/90 lb springs and the shock valving to match will help quite a bit..

Sam
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Old 04-28-2009, 10:04 PM
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Quote:
Originally Posted by cranky1
Can you explain to me what the difference it makes if the spring is 'over' a shock or stands alone? Does it matter if the shock is inside the spring instead of being mounted separately?
But yeah, go with a light spring. Seems like the parts houses, like Summit etc always says to use a heavy spring, no matter if it's for the street or drag racing.
The spring does not know if it is over a shock or standing alone. There are two items you need to be concerned about with the coil-overs on your car. Wheel rate and shock dampening. Trying to get advice regarding a spring rate is likely to be a crap shoot because of the factors involved to get your car to ride the way you want it to. The rear vehicle weight of the car, the position of the coil-overs on the axle, the angle of the mounts, the unsprung weight of the rear end all make up the wheel rate of the suspension and play a major factor in spring selection.

You know that the suspension is too stiff; is it over-sprung, over dampened or both, you need to do some testing to find out. If your shocks are adjustable, set them full soft and drive the car. If it's better but still too stiff, take your springs to a race shop and get them rate checked. Since coil-over springs tend to be common sized in dia and length, sometimes a race shop will let you try different springs, and if you don't scratch them up you can return them for a different set until you find what you like. If you can't find a rate checker, Google search for a spring rate calculator and take some measurements and do the math to find out what you have. It is better to go a little on the light side and pre-load the spring than to go too stiff. And you are absolutely right, most small hot rods that I have come across, (Model A's, 32's etc) are over-sprung and over-dampened, especially in the rear.

Andy
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Old 05-14-2009, 03:10 PM
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Thanks a lot guys

I was able to print out all of the answers to the coilover problems and about 8 of us became educated while having coffee at the Krystal. Turns out that the biggest problem that my friend encountered was the Panhard Bar. He never leveled it. Everytime he hit a bump or hole, the car would steer off to the right. Thanks again. Don
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