Damper length

Discussion in 'Mech Tech' started by ssg295, Jun 9, 2021 at 11:35 AM.

  1. Had a quick search but couldn't find an answer.
    Our bus is lowered a couple of inches at the front by beam adjusters and by one (I think) spline at the back.
    The dampers are originals and have seen better days so I'm going to get some gas ones.
    How do I determine the correct damper length to buy? I guess standards aren't the correct length as it's been lowered but unsure what to measure front and back.
  2. Mines lowered at the front and very saggy at back .... got standard shocks all round.
    Lasty likes this.
  3. If it still has bump stops, then standard shocks will do.

    Otherwise, your suspension travel is wheel against wheel arch (minimum) to the same extension (maximum) as stock .

    With a standard shock this is BANG as you smack the shock absorber against its endstop at minimum extension, just before/as the wheel rubs if you dont have bump stops.

    Beetle rear shocks are recommended to avoid the banging. (shorter minimum extension)
    Coilover shocks are recommended to avoid the banging and the rubbing.
    ssg295 likes this.
  4. Yep, still got bumpstops. What length max and min is standard? Seem to be loads of different lengths on vw heritage. Anyone got experience of GAZ adjustable?
  5. Last edited: Jun 9, 2021 at 2:46 PM
    Jean-François and ssg295 like this.
  6. Standard extended/compressed lengths:

    68-69 Front 419mm/16.5 - 217mm/8.54”
    70-79 Front 414mm/16.3” - 272mm/10.7”

    68-71 Rear 561mm/22” - 347mm/13.6”
    72-79 Rear 581mm/22.9” - 358mm/14”

    I’ve had Gaz adjustable dampers on my MGB for 20 years and on the bus for about 3½ years. They're easy to adjust with a thumb wheel, double acting and they can be rebuilt if necessary – although I have never needed to.

    I have these on the front http://www.rallydesign.co.uk/product_info.php?products_id=5244 with 140lb springs https://www.rallydesign.co.uk/product_info.php?cPath=465_1153_1161&products_id=13250
    Last edited: Jun 10, 2021 at 7:18 AM
    ssg295 likes this.
  7. By the way, congratulations on correctly calling them dampers and not shock absorbers, shocks or even shox. :thumbsup:
    Soggz, F_Pantos, ssg295 and 2 others like this.
  8. One of my pals is always rattling on about the correct names for this and that. He would indeed accept calling them dampers but would mildly interrupt and give them their full title of ‘Road Spring Dampers’ then congratulate you for not using an ‘Americanism’ like shocks etc. Don’t ever get him started on ‘Tracking’ :)

    Ozziedog,,,,,,,, and I just wanted to drink my Fosters :beer:
    77 Westy likes this.
  9. "Dampeners" is even worse...
    Ozziedog likes this.
  10. I'm thinking of "throwing" a new set of shocks on mine. :)
    Ozziedog, rob.e, snotty and 1 other person like this.
  11. You mean “shox”?
    Ozziedog likes this.
  12. Even I have a line I won't cross.
    Ozziedog and Lasty like this.
  13. ‘Shockers’.:thumbsup:
    Ozziedog likes this.
  14. I bet you have your “oil galleys” “align bored” ;)
    zedders likes this.
  15. Knickers!
  16. To get the correct length of Bilsteins or Gaz ordered is this the way to do it?
    Once I've got the adjusters set to the ride height I'm happy with, do I remove the dampers (front and rear) then measure the distance between the mounts, add/subtract 40-50mm to get max and minimum spec?
    Is this the correct method for front and rear?
  17. Ozziedog,,,,,,,, Then get em on there boy, but not in the car park.:)
  18. I tried throwing them on the Yank way but I dented the bodywork and scratched the paint. I'm guessing the yanks have more skills/better aim. :(

    I had intended to throw a new engine in too, but I can't even pick it up!
  19. Are you going to the Techy??? Be good to see you in real life again

    Ozziedog,,,,,,,,maybe a beer or two :)
  20. Nay lad, I called it a day after about 20 on the trot...or was it 30! All my mechanical exploits are now outdoor in a rough carpark as it is and living in a boat is like camping every day - sort of.

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