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  #1  
Old 06-02-2010, 10:14 AM
Blind Studios's Avatar
Blind Studios Blind Studios is offline
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Making your own reverse eye leaf springs

So, I need some opinions on this idea I've got floating around in my head.

I picked up a full set of stock YJ leaf springs for my postal Jeep project.

I was content to mount them up under as is, until I was flipping through the Speedway catalog and noticed the "reverse eye" springs for the transverse front ends.

Now the stock YJ springs are pretty flat to begin with so I figured that disassembling the pack and flipping the main wouldn't be too big of a deal.


So, here is the stock leaf....





One of the four leafs was bent, so I used that one as the guinea pig to try out my idea. Change went pretty easy, cleaned up the leafs a bit and reassembled, with the main flipped, of course.....



I did some research on HAMB and other hot rod sites on the interwebz and found this to be fairly common.

Mostly it gives a dropped of the full width of the spring eye, since the main leaf is now coming off the complete other side of the mount.

A little side by side....



The flip definately flattened the leaf, the bent part of the leaf makes it appear that the leaf goes neg. arch.

But what I'm wondering is if that's going to be a problem on a on road car.

Also I planning on using the larger 5 leaf packs if they end up making it on the PJ.

I really like the idea of lowering the vehicle with out use of blocks.

I'm hoping that some more experienced hot rodders will pipe in.

Thanks and let me know what you think.


-Jeff
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  #2  
Old 06-02-2010, 10:38 AM
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Do it.

Unlike off road you will virtually never cycle the springs on this thing so that type of stress is virtually non existent.

Couple of thoughts.
On your front springs if you want the best ride put the shackles in the back but if you want the best handling put the shackles in the front.
On both F&R springs but particularly on the rear; Clamp the side of the spring-pack that is fixed (not the shackle side) so that the leaves are fairly tight. This will make the spring work more as a Link, and in the rear you will get a much straighter and harder launch off the line. Finally in the rear use a solid bushing such as Delrin again for a better launch, use Poly in the front and for all the shackle ends.

E
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Old 06-02-2010, 12:07 PM
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Blind Studios Blind Studios is offline
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Thanks for the tips, E.

The shackles are going on to the front of the vehicle. Mostly because I planned to move the shackle hanger from under the frame to the front of the bumper.

I've seen a couple of low CG builds on Pirate that have used this to keep it low.


I had planned on Poly for the front. I hadn't given the rears much thought, but the solid bushing back there makes sense.

Does using the spring clamps on the fixed side affect driveability???? Any really weird handling charcteristics.

I'll update my progress in the PJ thread as I get the leaf packs both reassembled.


-Jeff
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Old 06-02-2010, 01:30 PM
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put em in and stomp on the skinny pedal
if it holds, it's good. If not, then you might want to try something else...

*yet another redneck engineering tip brought to you by flatlinesup...
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Old 06-02-2010, 02:12 PM
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Quote:
Originally Posted by Blind Studios View Post
Thanks for the tips, E.

The shackles are going on to the front of the vehicle. Mostly because I planned to move the shackle hanger from under the frame to the front of the bumper.

I've seen a couple of low CG builds on Pirate that have used this to keep it low.


I had planned on Poly for the front. I hadn't given the rears much thought, but the solid bushing back there makes sense.

Does using the spring clamps on the fixed side affect driveability???? Any really weird handling charcteristics.

I'll update my progress in the PJ thread as I get the leaf packs both reassembled.


-Jeff
Driveability, not much of an effect... More precise...
The spring rate will be slightly higher (stiffer) with the leafs clamped in compression (bump) however if you leave the rear half virtually unclamped the spring will fall away (Droop) at close to the same rate.

With the shackles on the front, in the front, I would seriously consider a Panhard/Track bar, and that is the only time I would suggest such with front leaf springs

E
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Old 06-02-2010, 04:35 PM
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Quote:
Originally Posted by Flatline's Up! View Post
put em in and stomp on the skinny pedal
if it holds, it's good. If not, then you might want to try something else...

*yet another redneck engineering tip brought to you by flatlinesup...
HI larious......



Yah was planning on both a panhard bar and anti sway for the front to match the rear.

So sounds pretty much like, "GO for it....."

-Jeff
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