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Old 03-24-2007, 02:40 PM
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Rear leaf spring question.....

Are parallel rear leaf springs really parallel, or are they normally set with a tad toe-in ? Thanks Jimmy

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Old 03-25-2007, 07:23 AM
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Hi Jimmy
I see that no-one has answered your question so I will try. Your best bet is of course to ask the experts like Posies who deal with them everyday. But if you think of the movement the springs go through, i.e. when the axle moves up and down it also moves fore and aft slightly due to the lengthening and shortening of the spring. This is what the shackles are there for. If the springs weren't parallel the shackles would bind up and not be able to allow for this movement.

Springs that have shackles front and back would react differently. Not sure what would happen there really. I know there are some good suspension guys on this Forum (Billy Shope?) I'm sure they would know.
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Old 03-25-2007, 07:46 AM
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Quote:
Originally Posted by Jimmy Clarke
Are parallel rear leaf springs really parallel, or are they normally set with a tad toe-in ? Thanks Jimmy
Depends on the car....some were parallel, some had a bit of a toe in.
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Old 03-25-2007, 07:53 AM
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Hi Poncho62

Can you elaborate on the shackles and how they would be fixed? I haven't seen many different types but the ones I've seen were always parallel. How did they avoid the binding up? What about springs with shackles front and back?

Thanks.
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Old 03-25-2007, 05:47 PM
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You can't have shackles front and back....One end must be mounted solid.....
As for binding, leaf springs dont move that much....why would they bind?
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Old 03-25-2007, 08:21 PM
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A frame often widens at the rear to satisfy other requirements, thus forcing the springs to follow. There is no need or advantage for a small deviation from parallelism.
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Old 03-25-2007, 09:49 PM
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Jimmy
Don't mean to hijack the thread but thought you might be interested in this set up.

Poncho62
As you can see in this photo shackles are front and back.
http://hotrodders.com/gallery/showph...cat/500/page/1
The tube around the propshaft and the trangular linkage from the tube to the ends of the axle ensure the axle stays in alignment. I am no suspension engineer but I would think that this set up relieves the spring of the load caused by acceleration and braking distorting the spring leading to 'axle wind up' (I think this is the correct term). Hope someone can confirm or enlighten me on this.

Also because the pivot point is further forward (the tube is bolted to a crossmember just aft the gearbox) the axle has a more vertical up and down motion so is more comfortable to ride in.

By the way these springs are exactly parallel. Even though the frame widens at the back the springs have been pushed out in the front to accomodate this.
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Old 03-25-2007, 10:12 PM
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The axle is held in alignment by the torque tube, There is nothing for the springs to do but hold the car up and keep the axle from moving laterally so they don't have to be held stationary at one end like a regular set that has a open driveline.

There is virtually no axle wrap, the torque tube is so long that the forces at the end are hardly none..

I think if that was a good way of doing a suspension it would still be in use today..
What is that thing , anyway?

Later, mikey
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