rear coil over shocks "tilted back mounting"

[Dragsinger]

Rear coil over shocks mounting options

In the past I have mounted rear coil over shocks “straight up” Because of limited space with the current project, “tilting” the top back about 8 degrees would solve the clearance issue.

Have some of you done so with an install? Is there any negative to tilting the shock back for clearance purposes?

This will be an aluminum body adjustable shock, 5” travel, 110 pound spring.

Thanks

[axegrinder]

The shocks and springs just act softer.

Denis

[BirdMan]

Quote 'The shocks and springs just act softer'

I feel the shocks will act stiffer as they will have to travel further for diff. vertical movement and therefore more controlability/adjustability. Might need to replace with longer travel ones.
On my Falcon I have ladder bars and run with the stock inward tilted shock location because of the above thought.
Yes, I believe the springs will appear softer and may require stiffer ones for same ride quality/stance.

[axegrinder]

Quote 'The shocks and springs just act softer'

I feel the shocks will act stiffer as they will have to travel further for diff. vertical movement and therefore more controlability/adjustability. Might need to replace with longer travel ones.
On my Falcon I have ladder bars and run with the stock inward tilted shock location because of the above thought.
Yes, I believe the springs will appear softer and may require stiffer ones for same ride quality/stance.

You have a point about the shocks. But Im not sure Where is MadBill? He would know.

Denis

[BLACK BART]

Denis, you had it exactly right the first time. The shocks and springs will act a little softer if tilted back rather than mounted straight up and down.

They will also have less travel for a given movement of the differential. Think of a right triangle. Put the 90° corner where the top of the vertical mounted shock would be. Put one of the other corners where the top of the angled shock would be. Then put the last corner where the shocks would mount on the bottom at the differential. Now pick a point on the vertical line part way up to simulate differential movement. Redraw the triangle without disturbing the two top corners. Now see which side of the triangle moved the most. The vertical side of the triangle that represents the vertical shock will always move the most compared to the angled side which represents the shock that's angled back.

My geometry teacher would be proud right now.

I hope that explanation made sense to someone other than me. CJ

[axegrinder]

Billy Shope clears it up on this thread so we know we are correct!

http://speedtalk.com/forum/viewtopic.php?t=7834

[Bubstr]

I was told by Carrea years ago, that the first 15 degrees didn't have too much affect in reality.
Here is something that used to be on The Aftco site



DETERMINE SPRING RATE
Ride rate correction chart when shock and/or springs are angled:

Mount Angle 10° 15° 20° 25° 30° Rate Multiplier .96 .93 .88 .82 .75
Example: A 200 # / inch spring mounted at a 20° angle gives a 176 # / inch rate when figured for ride rate (200 x 0.8.
SUGGESTED SPRING RATE

SUGGESTED SPRING HEIGHT
FRONT
REAR
Rate lbs. Total Weight on Front Wheels Rate lbs. Total Weight on Rear Wheels 200 600–800 lbs. 65 Under 800 lbs. 250 800–1000 lbs. 80 800–1000 lbs. 275 1000–1100 lbs. 95 1000-1100 lbs. 300 1100–1200 lbs. 110 1100–1200 lbs. 350 1200–1500 lbs. 125 1200–1300 lbs. 400 1500–1800 lbs. 150 1300–1400 lbs. 450 1800–2000 lbs. 175 1500–1700 lbs. 500 2000–2300 lbs. 200 1700–2300 lbs. 550 2300–2500 lbs.

650 2600 lbs. & up





DOUBLE ADJUSTABLE DRAG SHOCKS Stroke Suggested Spring Height 3" 7" 4" 7-8" 5" 10-12" 7" 14" 9" 14"

Here is Aftcos tech site.http://www.afcoracing.com/tech_pages/dragshock.shtml