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#551754 - 04/01/19 06:34 PM Re: I.R.S. [Re: IvorMog]
BobtheTrain Offline

Part of the Furniture

Registered: 15/04/14
Posts: 4843
Loc: Renfrewshire
Originally Posted By IvorMog
The term "live axle" refers to an axle where the hubs are connected by a solid beam with no relative articulation between them.

Several forums and I stand corrected.


Edited by BobtheTrain (04/01/19 06:35 PM)
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#551764 - 04/01/19 07:24 PM Re: I.R.S. [Re: howard]
Hamwich Online   content

Talk Morgan Sage

Registered: 28/04/08
Posts: 6966
Loc: Gloucestershire, UK
I always thought a beam axle was one that spanned the car in a single unarticulated unit linking both wheels, and could be live or dead. Live meaning drive is transmitted, dead meaning no drive, like a De Dion tube axle.

Any other sort of axle, where only a single wheel is connected, is a split axle, and again these can be live or dead.
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#551774 - 04/01/19 08:33 PM Re: I.R.S. [Re: Hamwich]
IvorMog Offline

Talk Morgan Regular

Registered: 17/04/17
Posts: 672
Loc: Staffordshire
Originally Posted By Hamwich
I always thought a beam axle was one that spanned the car in a single unarticulated unit linking both wheels, and could be live or dead. Live meaning drive is transmitted, dead meaning no drive, like a De Dion tube axle.

Any other sort of axle, where only a single wheel is connected, is a split axle, and again these can be live or dead.




Research needed to confirm either way but the outcome will be interesting.

Could be 40 odd years of preconceived ideas going up in smoke here.
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#551781 - 04/01/19 09:44 PM Re: I.R.S. [Re: howard]
howard Offline
Part of the Furniture

Registered: 01/01/09
Posts: 4047
"Dead" vs "live". I'm firmly of the view that engineering is more important than sematics! innocent

But from a quick glance at my collection of Morgan build photos, it looks to me as if the trad could be modded to carry IRS. Be a biggish job for a one off and likely would result in something as expensive as an Aero so probably not worth it.

As an interesting aside, I cant see why MMC havent altered the chassis to get rid of the underslung and allow more axle movement. That doesnt look too difficult.

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#551795 - 04/01/19 10:39 PM Re: I.R.S. [Re: howard]
Robbie Offline

Talk Morgan Expert

Registered: 08/01/07
Posts: 2576
Loc: Co Wexford, Ireland
By the looks of the photos in Miscellany they are designing a new chassis so the short travel may well not last much longer
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#551799 - 04/01/19 10:54 PM Re: I.R.S. [Re: Hamwich]
BobtheTrain Offline

Part of the Furniture

Registered: 15/04/14
Posts: 4843
Loc: Renfrewshire
Originally Posted By Hamwich
I always thought a beam axle was one that spanned the car in a single unarticulated unit linking both wheels, and could be live or dead. Live meaning drive is transmitted, dead meaning no drive, like a De Dion tube axle.

Any other sort of axle, where only a single wheel is connected, is a split axle, and again these can be live or dead.

That's what I thought.
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#551800 - 04/01/19 10:54 PM Re: I.R.S. [Re: howard]
cerealsurfer Offline
Talk Morgan Expert

Registered: 09/10/06
Posts: 2312
There was a +8 racer with IRS front and rear based on a completely revised chassis and a fibreglass body. I believe it was developed by David Rutherford and came up for sale about a year ago on racecarsdirect.



It was hard to move on and is a bit of a curio having had Modsports spec effectively written out of the Morgan racing rulebook.

The chassis issues with rear IRS were addressed - this is where the Aero chassis started life. From memory, when Charles Morgan was racing the last of the Trad +8’s (Blue with Yellow Wheels) and despite a considerable amount of modification it was just not cutting the mustard.



Next development was the revised and stiffer Aero chassis as was originally raced in a trad body form as Big Blue (as was fitted with a large Ceverolet LS motor).



The early diff/hub/wishbone mounting design in a separate cradle was to facilitate quick rear end swaps during endurance racing. Only 4 bolts holding the entire rear assembly in place.

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#551809 - 05/01/19 12:24 AM Re: I.R.S. [Re: cerealsurfer]
+8Rich Offline

Member of the Inner Circle

Registered: 15/12/09
Posts: 18455
Loc: UK
Thanks for that fascinating bit of race history on the Plus 8 IRS.
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1999 Indigo +8






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#551830 - 05/01/19 08:58 AM Re: I.R.S. [Re: howard]
Culminator Offline
Learner Plates Off!

Registered: 26/08/10
Posts: 412
Aha! I knew I'd seen a David Rutherford engineered IRS plus 8 somewhere....

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#551833 - 05/01/19 09:14 AM Re: I.R.S. [Re: howard]
Richard Wood Offline
Has a lot to Say!

Registered: 03/02/16
Posts: 1388
Loc: East Harling, Norfolk UK
FWIW I agree with Bob's (IvorMog) description. The term live relating to the fact a solid axle links both suspended wheels rather than them moving independantly. Nothing therefore to do with them being driven or not.

Wicki is a bit vague on this but does state the drive axle may be a live axle, suggesting it doesn't have to be driven.


Edited by Richard Wood (05/01/19 09:15 AM)
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