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11/10/2021 8:36 AM  #1


Spring perch location

Please explain the advantage(s) of relocating spring perch outboard 1”?

How does existing spring rate change?

How does existing shock (regardless of type) change?  (In general terms)

Ya might have to explain in 4th grade terminology😜

 

11/10/2021 9:50 AM  #2


Re: Spring perch location

I can't answer your question, but am wondering who is promoting moving the spring perch outboard?  Seems this could impact the spring contacting the tire, and trouble aligning with the front and read frame mounts.


65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
 

11/10/2021 10:37 AM  #3


Re: Spring perch location


famous poems about nature and life

Other than instant tire-scrub........wonder'in what else would be accomplished.......
6sal6

Last edited by 6sally6 (11/10/2021 10:39 AM)


Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
 

11/10/2021 11:00 AM  #4


Re: Spring perch location

6sally6 wrote:


famous poems about nature and life

Other than instant tire-scrub........wonder'in what else would be accomplished.......
6sal6

 
You would have use reversed rims and wheel well cut outs similar to WVA Tacoma pick up trucks😱


Good work ain't cheap, Cheap work ain't good!   Simple Man
 

11/10/2021 11:31 AM  #5


Re: Spring perch location

Do a search on VMF or contact John at Openteacker for details.

 

11/10/2021 11:39 AM  #6


Re: Spring perch location

We’re talking front suspension right?

 

11/10/2021 3:33 PM  #7


Re: Spring perch location


"Those telephone poles were like a picket fence"
 

11/10/2021 4:02 PM  #8


Re: Spring perch location

Bentworker wrote:

We’re talking front suspension right?

I BET YOU'RE RIGHT!!.........
Funny how just one word change the entire post!
6s6
 


Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
 

11/10/2021 4:21 PM  #9


Re: Spring perch location

Moving the perch outward effectively increases the spring rate because the wheel has less lever arm length to move the spring. Same with the shock. It sees more movement than in its stock location, making the suspension more harsh.
Since most tires come pretty close to the perch already, you would need to be sure you have adequate clearance.
Ride height would be increased. If you want to know how much, compare the lever ratios between UCA bushing, spring perch mount and ball joint.


Money you enjoy wasting is NOT wasted money... unless your wife finds out.
 

11/10/2021 7:20 PM  #10


Re: Spring perch location

Therefore, a lower spring rate in the revised location can perform the same work.

Thus less weight ( and mass) on the front suspension as well as quicker response.

Am I looking at these benefits correctly?

     Thread Starter
 

11/10/2021 8:49 PM  #11


Re: Spring perch location

That's my take on it Dan. In your case with the coil overs, you're only benefit is height adjustability. Coil overs mounted to the LCA are usually done with an improved motion ratio.With only two extra holes in the UCA, you'll get most of the benefits of a LCA setup.
I've got drilled and offset UCAs sitting on a shelf along with progressive springs. Was thinking bout trying some 6 cyl springs but decided on the progressives.
Height will raise by about what you lose with the Arning drop, but that won't worry you.

 

Last edited by 50vert (11/10/2021 9:03 PM)


"Those telephone poles were like a picket fence"
 

11/10/2021 9:21 PM  #12


Re: Spring perch location

50vert wrote:

That's my take on it Dan. In your case with the coil overs, you're only benefit is height adjustability. Coil overs mounted to the LCA are usually done with an improved motion ratio.With only two extra holes in the UCA, you'll get most of the benefits of a LCA setup.
I've got drilled and offset UCAs sitting on a shelf along with progressive springs. Was thinking bout trying some 6 cyl springs but decided on the progressives.
Height will raise by about what you lose with the Arning drop, but that won't worry you.

 

so did it raise your car with the progressive springs?

 


Its really me....I fixed my caps lock .
 

11/10/2021 9:24 PM  #13


Re: Spring perch location

Thanks Barry…missed visiting with y’all this year.

When I was rebuilding/modifying the suspension 2 years ago, I did add the outboard holes 1”.
Just made a simple sheet metal template to add new holes.
I did mock it up to see the static change.

Still using stock location.
Wanted to see differences with just the coil over setup first. (350# springs for small blocks)
No regrets.

Thanks Josh, found some stuff to read up on.



     Thread Starter
 

11/10/2021 10:10 PM  #14


Re: Spring perch location

BILLY WALTON from GEORGIA wrote:

50vert wrote:

That's my take on it Dan. In your case with the coil overs, you're only benefit is height adjustability. Coil overs mounted to the LCA are usually done with an improved motion ratio.With only two extra holes in the UCA, you'll get most of the benefits of a LCA setup.
I've got drilled and offset UCAs sitting on a shelf along with progressive springs. Was thinking bout trying some 6 cyl springs but decided on the progressives.
Height will raise by about what you lose with the Arning drop, but that won't worry you.

 

so did it raise your car with the progressive springs?

Ask me when they get off the shelf Billy ..... don't hold your breath in the meantime though.


"Those telephone poles were like a picket fence"
 

11/10/2021 10:28 PM  #15


Re: Spring perch location




Spring perch and spring combo will have less clearance than coil overs.
These pics are in stock location.
Notice the clearance to factory shock tower brace, easy enough to modify as needed.
Just additional information to consider.

     Thread Starter
 

11/10/2021 11:39 PM  #16


Re: Spring perch location

Nos681 wrote:

Thanks Barry…missed visiting with y’all this year.

When I was rebuilding/modifying the suspension 2 years ago, I did add the outboard holes 1”.
Just made a simple sheet metal template to add new holes.
I did mock it up to see the static change.

Still using stock location.
Wanted to see differences with just the coil over setup first. (350# springs for small blocks)
No regrets.

Thanks Josh, found some stuff to read up on.

Yeah, it's tough missing two Bashes in a row. I hope Di enjoyed her first as much as you, (and I) did.
I should'a realised you would'a covered as many bases as you could, when you did the viking upgrade. 
If and when you move it, run the 350# till you can form an opinion then try something lighter for awhile.
Easy to swap springs on your setup is a bonus.
I haven't seen a results review done that way with coil overs similar to yours, I'd be interested in hearing your results.


"Those telephone poles were like a picket fence"
 

11/11/2021 9:45 AM  #17


Re: Spring perch location

6sally6 wrote:

Bentworker wrote:

We’re talking front suspension right?

I BET YOU'RE RIGHT!!.........
Funny how just one word change the entire post!
6s6
 

Ditto!
 


65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
 

11/11/2021 11:59 AM  #18


Re: Spring perch location

Moving the mounting point outboard improves the motion ratio.  Makes your shocks more effective, changes the actual spring rate.  Seems like many of the coil over setups do it.  If you have the room it should make your shocks and springs a little “stiffer”.

 

11/11/2021 1:50 PM  #19


Re: Spring perch location

Nos681 wrote:

Therefore, a lower spring rate in the revised location can perform the same work.

Thus less weight ( and mass) on the front suspension as well as quicker response.

Am I looking at these benefits correctly?

 
Correctamundo. I've always thought of this mod to accomplish the points you made Dan. But if you were looking for a stiffer ride I guess you could use the same springs.


Bob. 69 Mach 1, 393W, SMOD Toploader, Armstrong  steering, factory AC.
 

11/11/2021 5:54 PM  #20


Re: Spring perch location

Actually…I was looking at the forces on upper control arm at mid span.

At stock location and at revised location.

Not like tire width was an issue back in 65.

I also have the understanding that the further away from vertical, more spring is required to perform same work…or is this just the shocks?

Last edited by Nos681 (11/11/2021 6:00 PM)

     Thread Starter
 

11/11/2021 6:58 PM  #21


Re: Spring perch location

Springs also lose their rating the more you move them from vertical.


Bob. 69 Mach 1, 393W, SMOD Toploader, Armstrong  steering, factory AC.
 

Board footera


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