Bumpstop source

In a previous thread here somewhere, it was mentioned that bumpstops composed of a closed cell urethane would be much better than standard rubber.
My current Hotbits came with rubber. (48mm units with 200mm of travel)

Where would be a good source for some good urethane bumpstops?
If I need to go to the salvage yard, what cars/models would be desirable?

Thanks,
Kent

reach in thru the spring and measure the rod diameter and post it, then i can probably suggest a bump stop.

3 to 3.5" would be good length.

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John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.

http://www.resuspension.com/Bump-Stops-p-1-c-92.html

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Jon Burke - KI6LSW
Blog: http://psgrallywrx.blogspot.com/

Here's some. I've never used them for Rally before (because I don't rally - just rallycross).

http://www.paragon-products.com/product_p/koni-70.34.95.htm

These are obviously made for Konis (which are probably crap for rally), and typically have a rod diameter of 21.75mm. Not sure what the rod diameter is for hotbits.

The damper rod is 22mm in diameter.
I'm aiming to have roughly 1/3 travel droop (~67mm),
2/3 travel compression (~133mm).

Thanks for the assistance.



Edited 1 time(s). Last edit at 08/18/2008 04:51PM by kentmdavis.

kentmdavis Wrote:
-------------------------------------------------------
> The damper rod is 22mm in diameter.
> I'm aiming to have roughly 1/3 travel droop
> (~67mm),
> 2/3 travel compression (~133mm).

Hooookay! 200mm travel, good. Ford says to use a 90mm bump stop when you have 200mm, and a 75mm when using 175mm tarmac length inserts so you could start there.
Their's is about 1.5" in diameter. Maybe a bit shorter if you use a larger OD,.
>
> Thanks for the assistance.
>
>
>
> Edited 1 times. Last edit at Aug 18, 2008 by
> kentmdavis.

---

John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.

Sorry for the confusion,
I'm not sure what orifice I pulled 200mm out of
but ACTUAL available travel is only 150mm.

So, to revise the numbers:
22mm shaft diameter
1/3 travel droop (~50mm)
2/3 travel compression (~100mm)
(0.090 motion ratio)