Re: Ride heighth adjustment

[robertfury@gmail.com]

'When you pull shims to adjust the torsion springs on the Magnum chassis, which raises the ride heighth, are you essentially increasing the spring rate? Similar to adjusting preload, and making a spring stiffer?

Robert
94 Continental 8.3 Cummins'

[Bill Edwards]

' Actually you probably are since it is compensating for the weakening of the torsion arm mounted in the rubber core. Sorry
Bill Edwards1999 Panther


Sent from Yahoo Mail for iPad

On Thursday, August 8, 2019, 6:47 AM, Bill Edwards wrote: No!


Sent from Yahoo Mail for iPad

On Thursday, August 8, 2019, 6:45 AM, robertfury@... [Safarifriends] wrote:  
When you pull shims to adjust the torsion springs on the Magnum chassis, which raises the ride heighth, are you essentially increasing the spring rate? Similar to adjusting preload, and making a spring stiffer?

Robert
94 Continental 8.3 Cummins

'

[James Exler]

'





Robert,

No, the spring rate is a factor of the bonded rubber torsion tube.

The weight applied to the torsion arm determines how much the arm deflects. All the shims do is adjust the height of the body relative to the arm. As the rubber weaken over time, it deflects further down lowering the body position so removing the shims raises
the body to the desired position.

Jim Exler, Nampa, ID

On 8/8/2019 6:45 AM, robertfury@... [Safarifriends] wrote:

 


When you pull shims to adjust the torsion springs on the Magnum chassis, which raises the ride heighth, are you essentially increasing the spring rate? Similar to adjusting preload, and making a spring stiffer?

Robert
94 Continental 8.3 Cummins

Virus-free.
www.avg.com






'

[Bill Edwards]

' No!


Sent from Yahoo Mail for iPad

On Thursday, August 8, 2019, 6:45 AM, robertfury@... [Safarifriends] wrote:  
When you pull shims to adjust the torsion springs on the Magnum chassis, which raises the ride heighth, are you essentially increasing the spring rate? Similar to adjusting preload, and making a spring stiffer?

Robert
94 Continental 8.3 Cummins

'

[TD]

'Robert,

As Jim E. explained very well, you are literally just adjusting ride
height, nothing more, nothing less. If you study the geometry of how
the coach hangs on the shackles of the torsion spring arms, where the
shim stacks are, you will see that adjusting ride height is all that
is accomplished. Absolutely no preload involved in that process.

John
'95 Safari Serengeti 38ft, Cummins C8.3-300, Allison
6spd

On 8/8/19, robertfury@... [Safarifriends]
wrote:

> When you pull shims to adjust the torsion springs on the Magnum chassis,
> which raises the ride heighth, are you essentially increasing the spring
> rate? Similar to adjusting preload, and making a spring stiffer?
>
> Robert
> 94 Continental 8.3 Cummins
>
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> Posted by: robertfury@...
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'

[robertfury@gmail.com]

'Not arguing for arguing sake, but if the spring rate isn’t being changed, why do so many on this forum claim it is very important to have the height correct? Obviously one would want to bottom out (which mine isn’t). Is there another reasoning?'

[Rollin']

'Robert,
Proper ride height ensures that the drive shaft angle between the trans output and the differential is minimized and proper steering geometry is maintained up front.
Bob2001 Zanzibar

Sent from Yahoo Mail on Android'

[James Exler]

'





Robert,

There are a few reasons to set the ride height to the factory spec.

First, the drive line angles were set using the right height. As the springs sag, it changes these angles.

Second, the auxiliary suspension components such as the roll bars and pan hard bars were set for the factory height. A lowered height changes their geometry.

Third, the proper height insures the coach is loading the suspension evenly as designed.

Jim Exler

On 8/8/2019 9:51 AM, robertfury@... [Safarifriends] wrote:

 


Not arguing for arguing sake, but if the spring rate isn’t being changed, why do so many on this forum claim it is very important to have the height correct? Obviously one would want to bottom out (which mine isn’t). Is there another reasoning?

Virus-free.
www.avg.com






'

[robertfury@gmail.com]

'So the sagging springs (torsion tube) just wears out? Most trucks today that use torsion springs (just round metal) are adjustable in preload, which raises the heighth. Seems like a bad design. I guess they had their reasoning? Or was it just to save money over a air bag system? Or air bags weren’t popular then?'

[Mark Cushman]

'One thing that happened with my Safari is that I had pull to the right when applying brakes.  Once the ride height was corrected that pulling disappeared.  So it clearly effects steering geometry.  
Mark1999 Safari 32’
Sent from my iPad

On Aug 8, 2019, at 9:13 AM, James Exler jimxexler@... [Safarifriends] wrote:

 

Robert,
There are a few reasons to set the ride height to the factory spec.
First, the drive line angles were set using the right height. As the springs sag, it changes these angles.
Second, the auxiliary suspension components such as the roll bars and pan hard bars were set for the factory height. A lowered height changes their geometry.
Third, the proper height insures the coach is loading the suspension evenly as designed.
Jim Exler
On 8/8/2019 9:51 AM, robertfury@... [Safarifriends] wrote:
 
Not arguing for arguing sake, but if the spring rate isn’t being changed, why do so many on this forum claim it is very important to have the height correct? Obviously one would want to bottom out (which mine isn’t). Is there another reasoning?
Virus-free. www.avg.com
'