[Mgs] Mgs Digest, Vol 168, Issue 3

Tue May 4 14:22:46 MDT 2021

 Moss rear springs lasted about 60K miles.  Got a pair from buddy on a car with only 55K miles a few years ago.  Back to normal.  I have about 235K miles on car.  Find someone to make or rear arch your original springs.
 The stuff today is just junk.
    On Tuesday, May 4, 2021, 02:01:32 PM EDT, mgs-request at autox.team.net <mgs-request at autox.team.net> wrote:  

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Today's Topics:

  1. Re: Ride height (Barrie Robinson)
  2. Re: Ride height (PaulHunt73)
  3. Re: Ride height (Barney Gaylord)
  4. Re: Ride height (PaulHunt73)
  Hello Paul,

 I got my local Brit car shop to fit springs all round as I had a serious case of unequal saggynitis.   They got them from Moss and all is perfectly fine now.

 Cheers
 Barrie

 On 5/3/2021 11:24 AM, PaulHunt73 wrote:

 The high rear end after spring replacement is common and is part of the 'too hard' thing needing extra weight in the boot to get the rebound straps fastened.   Personally I wouldn't jack up the front to match the rear, people spend inordinate amounts of time and money trying to lower MGBs!  What you could try is lowering 'blocks' between the axle and the springs, as used with parabolic springs, but may need longer U-bolts.   Even with new OEM rears my CB roadster was too low when fully laden, bottoming and grounding in country lanes, I ended up extending the rear shackles.   PaulH. 
 ----- Original Message -----  3 years ago I got an MOT safety test fail on the sagged rear springs, so these were replaced.  
>From that moment on the car looks a bit like a dragster with the rear higher than the front.

So I should look for replacement front coils.

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  The lower mounting point for the rebound strap on an MGB (the car that was the subject of the original enquiry) is on the axle.  So when you fit lowering blocks the body becomes lower relative to the axle and the rebound straps become slacker not more taut.  The bump rubber on the body is now also closer to the pedestal on the axle, so the damper can't be 'compressed' any more than it was before.  And with the same straps the damper can't be extended any more than previously either. Incorrect springs that give a very raised ride height may well cause the problem of picking up a rear tyre in a fast turn, but lowering blocks will reduce or eliminate that. PaulH. ----- Original Message ----- 

Lowering blocks raise the rear axle in relation to the springs, but do not change the spring height in relation to the body or chassis frame.  You can correct the ride height that way, but it will not correct the gross misalignment for the rebound straps (which are attached to the lower spring mounting plate).

If the rebould straps are close to taught when at rest, they you will be royally screwed on handling when driving.  It will pick a rear tire completely off the ground in a fast turn, causing severe oversteer (very dangerous condition).  And if you install longer rebound straps, you will get damage to the lever arm shocks from overtravel.

      -  

Yeah, good point.  Sorry about the slip up.  Iforgot the lower pin for the rebound strap is on the axlehousing.

Still no excuse for new replacement springs being manufactured with toomuch arch (and too high spring rate).  Theory of a leaf spring isthat when fully loaded it should be straight, flat, no arch.  Thisgives it the highest lateral stiffness and least tendency to twist andmisalign the springs and axle in hard cornering.  It just rubs methe wrong way to have to jury rig an perfectly good assembly toaccommodate use of a faulty replacement part.

At 03:32 AM 5/4/2021, PaulHunt73 wrote:

The lowermounting point for the rebound strap on an MGB (the car that was thesubject of the original enquiry) is on the axle.  So when you fitlowering blocks the body becomes lower relative to the axle and therebound straps become slacker not more taut.  The bump rubber on thebody is now also closer to the pedestal on the axle, so the damper can'tbe 'compressed' any more than it was before.  And with the samestraps the damper can't be extended any more than previously either.

Incorrect springs that give a very raised ride heightmay well cause the problem of picking up a rear tyre in a fast turn, butlowering blocks will reduce or eliminate that.

PaulH.

----- OriginalMessage ----- 

      - Lowering blocks raise the rear axle in relation to the springs, butdo not change the spring height in relation to the body or chassisframe.  You can correct the ride height that way, but it will notcorrect the gross misalignment for the rebound straps (which are attachedto the lower spring mounting plate).   

      - If the rebould straps are close to taught when at rest, they you willbe royally screwed on handling when driving.  It will pick a reartire completely off the ground in a fast turn, causing severe oversteer(very dangerous condition).  And if you install longer reboundstraps, you will get damage to the lever arm shocks from overtravel.

 Amen to that!
 ----- Original Message ----- Still no excuse for new replacement springs being manufactured with too much arch (and too high spring rate).  Theory of a leaf spring is that when fully loaded it should be straight, flat, no arch.  This gives it the highest lateral stiffness and least tendency to twist and misalign the springs and axle in hard cornering.  It just rubs me the wrong way to have to jury rig an perfectly good assembly to accommodate use of a faulty replacement part.

      -  

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