Shackle Angle (1 Viewer)

[Z()LTAN]

can someone please enlighten me on the ideal shackle angle i need with my SOA and Shackle reversal on the 75 series.

Pix, links, anything people

thanx in advance

 

[Eskimo]

When the spring is totally flat, I shoot for about 50° back from vertical. The shackles should be long enough so they don't invert at full droop...

 

[wngrog]

:Like this...if the springs sag on you, you can fiddle with the length of the shackle later.

 

[projektdotnet]

:Like this...if the springs sag on you, you can fiddle with the length of the shackle later.

That is about where mine sit angle wise, it rides nice (for leaf springs anyway)

 

[Z()LTAN]

thanx yaal

 

[Teebag]

Is this the same for front/rear soa/non soa?

 

[Pin_Head]

Is this the same for front/rear soa/non soa?

It depends on spring shape. It is appropriate for flat springs, both front and rear, SOA and SUA to maximize spring compression and droop.

It may not be appropriate for highly arched lift springs without going to a much longer shackle as the spring may contact the frame on compression. You need to measure the inside curved surface to find out the maximum lenght of the spring at compression and see if you have enough room.

It is mainly about spring motion. The contribution to ride quality is minimal compared to what happens when your spring hits the frame or the shackle inverts.

 

[wantatlc]

so what is the downfall of an improperly angeled shackle? For example, mine are closer to 90 degrees (to the frame) - I assume it just adds to a harsh ride? and, how would you change just the angle? by changing the shackle out itself?

front

rear

 

[projektdotnet]

Add some weight until the srpings settles

 

[wantatlc]

I doubt my svelt 150 pounds adds enough to do a damn thing to those springs... guess I need a heavier girlfriend to make up for it

 

[bigbadshawn]

or get two girlfriends

 

[1973Guppie]

those shackles being straight up and down will cause it to be a stiffer ride i am sure, I would think that fabbing up some longer shackles would solve the problem, you want the shackles to compress and soak up some of that road bumps when driving. I would think longer shackles would allow the room for the shackle to have more of an angle. I may be wrong though, or I may just be drunk, someone I am sure will let me know.

 

[Teebag]

Thanks Pin, I will have to wait till I have my springs fitted, and post pictures and ask questions at that time

 

[Mark W]

A vertical angle like that restricts droop and reduces up travel compared to a shackle at a gentler angle.


Mark...

 

[cruiserfreek]

not to take away from the main creator of the thread, but what if the shackles had the angle going toward the inside?

 

[LSUfj]

not to take away from the main creator of the thread, but what if the shackles had the angle going toward the inside?

if it is angled toward the inside, the spring will probably not be able to compress, when the spring compresses, it gets longer. Since it is static at one end, the other end (shackle end) is where it must "grow" in length. The correct angle in the pic above allows for the spring to grow under compression and shrink under droop....hope that makes sense.

 

[Mark W]

Angled inward will not prevent compression. It will however make for a harsher transfer of any impact to the rig as the spring does compress. And the same effects of a vertical shackle apply here too, just magnified.

Mark...

 

[projektdotnet]

I doubt my svelt 150 pounds adds enough to do a damn thing to those springs... guess I need a heavier girlfriend to make up for it

my skyjackers had to have about an additional 350lbs (160 in sandbags inside a container weighing rougly nother 150 and my 33x12.5 swamper radial for another 50(ish)) that reminds me...I love my soa

Edit: found the picture of this setup too

 

[wantatlc]

A vertical angle like that restricts droop and reduces up travel compared to a shackle at a gentler angle.


Mark...

Although Guppie makes an inference about even longer shackles (damn though, mine seem pretty long at 4 3/4" c2c when I look around)... the bigger question is (1) how would you fix this in my case without anything radical - a different style of shackle - and (2) how would it get this way on mine that is SUA as compared to another that is SUA and not running nearly 90 degree shackles?

THEORY: Also, I wonder if a static photo of a sitting still vehicles shackle angle really relates well to actual real world usage? That is, as it sits, it is an issue. But, as it moves: gravity & momentum take hold, the body moves and springs load and flex and weight is added with people and what not so when you actually drive and say come across a bump or hole or rut, since the rig is in movement (+ previously mentioned variables), you might be hitting that object at a time where the state of the vehicle relative to those shackles is no longer at 90 degrees in the real world so no harm no foul???

I think that theory is somewhat tenuous, but kind of makes sense in a way to me. BUT, I still see no harm in trying to make a change so mine are not 90 degrees, but not sure how without a radical change.

BTW, I was looking at SOR and saw this photo..

not much better angle than mine in their sales literature.... gives one the impression that if theirs is okay mine is okay..

 

[Pin_Head]

the bigger question is (1) how would you fix this in my case without anything radical - a different style of shackle - and (2) how would it get this way on mine that is SUA as compared to another that is SUA and not running nearly 90 degree shackles?

..

(1) You have to relocate the spring hanger or shackle hanger or get a longer spring.

(2) Your aftermarket lift springs are too short?



The major effect will be to limit droop. I can't see how it would limit compression or up travel. The effect on ride quality is not a big deal in my experience, so I would not do (1) above if this is your major concern.