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How does a Dedion axle work?
novacaine - 29/1/08 at 04:59 PM

Ive been having a browse around the site for the past hour or so trying to work out how a dedion axle works...

ok so take for example the gts Dedion axle, does the sierra diff attack to the dedion axle then it can just be treated like a live axle or is the diff mounted to the chassis then the dedion goes around the diff but is not attached to it?

sorry if its been covered before i just cant find any relavant threads

cheers !

Alan B - 29/1/08 at 05:02 PM

The diff is solid mounted to the chassis, and the De Dion tube basically holds the wheels together. So really it's a lot like a live axle, but with the diff taken out of unsprung weight.

novacaine - 29/1/08 at 05:06 PM

ahh right cheers!

Clever, simplicity of live axle without the weight

thanks

jkarran - 29/1/08 at 05:12 PM

quote:
Originally posted by Alan B
The diff is solid mounted to the chassis, and the De Dion tube basically holds the wheels together. So really it's a lot like a live axle, but with the diff taken out of unsprung weight.


And the prop shaft torque removed from the 'axel' presumably?

onzarob - 29/1/08 at 05:18 PM

This is the best explanation i have found, about 3/4 the way down the page.

http://www.carbibles.com/suspension_bible.html

novacaine - 29/1/08 at 05:36 PM

quote:
Originally posted by onzarob
This is the best explanation i have found, about 3/4 the way down the page.

http://www.carbibles.com/suspension_bible.html



that is pretty damn good, thanks for the link

dhutch - 29/1/08 at 06:05 PM

Yeah, sounds about right.
- Rightly or wrongly I was first introduced to it as 'a way to use a diff deisgned for independate rear suspention in a car designed for a live rear axle' .
- But yes, basically its bastardised halfway house between live rear and fully independant, that actaully seams to work quite well.



Daniel

bracey - 29/1/08 at 06:19 PM

got it on rear of indy works great good traction

mcerd1 - 29/1/08 at 07:14 PM

quote:
Originally posted by jkarran
And the prop shaft torque removed from the 'axel' presumably?


the torque reaction will be through the chassis like an IRS

NS Dev - 30/1/08 at 07:16 PM

de-dion is a great setup, probably pretty much the ultimate seven setup really.

Combines the light CAR weight of a live axled car with the light UNSPRUNG weight of an IRS car, and maintains good rear end traction due to excellent camber control.

(Note the caps above, irs cars tend to be heavier in broad terms due to the chassis having to "reach further" and live axle cars lighter due to simpler chassis i.e. only panhard rod or wl behind the axle line.

procomp - 1/2/08 at 09:44 AM

Hi although a dedion setup is usually 20-25kg heavier than a live axle setup overall.

Cheers Matt