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#551584 - 03/01/19 08:38 PM I.R.S.
howard Offline
Part of the Furniture

Registered: 01/01/09
Posts: 4047
Independant rear suspension and not the Internal Revenue Service , Button smile

In these days of custome / modified car build, has anyone altered a trad chassis to take an IRS system? Not impossible I would have thought - at a recent classic car meet there was a Lotus Cortina that had been modified for Jim Clark with Elan rear suspension, and unlike a trad the Cortina hasnt got a chassis to hand bits off..

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#551585 - 03/01/19 08:46 PM Re: I.R.S. [Re: howard]
DaveW Offline
Roadster Guru
Member of the Inner Circle

Registered: 11/12/08
Posts: 16767
Loc: South Yorkshire
Not sure how well IRS matches a separate chassis.

Some say the TR4 handles better than the 4a.

It's been done on MGBs using a modified Sierra rear but it puts the dampers at such an angle that they can fail prematurely.
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#551593 - 03/01/19 10:00 PM Re: I.R.S. [Re: DaveW]
howard Offline
Part of the Furniture

Registered: 01/01/09
Posts: 4047
Originally Posted By DaveW
Not sure how well IRS matches a separate chassis.



Lotus Elan - nothing handles better. Loads of TVRs. Generations of Ferraris. Corvette

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#551597 - 03/01/19 10:16 PM Re: I.R.S. [Re: howard]
Button Offline
Talk Morgan Enthusiast

Registered: 19/12/11
Posts: 1582
Loc: Seattle, USA
Originally Posted By howard
Independant rear suspension and not the Internal Revenue Service , Button smile

In these days of custome / modified car build, has anyone altered a trad chassis to take an IRS system? Not impossible I would have thought - at a recent classic car meet there was a Lotus Cortina that had been modified for Jim Clark with Elan rear suspension, and unlike a trad the Cortina hasnt got a chassis to hand bits off..


Ha Ha!
No but I have wondered about the feasibility of an IRS. I have wondered if I would like this feature. Not sure I would. I have considered going to aftermarket disks for the rear without the parking brake drum to lower the unsprung weight. But with My aging driver's style, whats the use? It looks like the 2019 +8 Aero could use an IRS. But then I would use a Corvette engine rather than a BMW mainly because it is cheaper and easier for Me to maintain.
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#551606 - 03/01/19 11:11 PM Re: I.R.S. [Re: howard]
DaveW Offline
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Registered: 11/12/08
Posts: 16767
Loc: South Yorkshire
Originally Posted By howard
Originally Posted By DaveW
Not sure how well IRS matches a separate chassis.



Lotus Elan - nothing handles better. Loads of TVRs. Generations of Ferraris. Corvette


But those chassis are nothing like a Morgan chassis which is basically in two dimensions. A comparative measure of torsional stiffness would be interesting.
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#551622 - 04/01/19 08:04 AM Re: I.R.S. [Re: howard]
howard Offline
Part of the Furniture

Registered: 01/01/09
Posts: 4047
True. But I dont know that you need stiffness for an IRS any more than you do for a solid axle. And much can be done to improve the stiffness of the trad chassis. The key issue would be fitting it in without much modification of the body panels, because once you start to change the bodywork you might just as well go the Aero route.

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#551623 - 04/01/19 08:21 AM Re: I.R.S. [Re: howard]
Culminator Offline
Learner Plates Off!

Registered: 26/08/10
Posts: 412
If I remember rightly, Dave Rutherford built a Trad Plus 8 with a Caterham De Dion set up. Semi independent but used for his race car.


Edited by Culminator (04/01/19 09:58 AM)

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#551628 - 04/01/19 08:57 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
Originally Posted By howard
Originally Posted By DaveW
Not sure how well IRS matches a separate chassis.



Lotus Elan - nothing handles better. Loads of TVRs. Generations of Ferraris. Corvette


Original Elan rear. MacPherson strut and lower wishbone plus under spec'd Hillman Imp rubber doughnuts if I remember.

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2018 Roadster - Red/Magnolia - "Morton"
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#551633 - 04/01/19 09:06 AM Re: I.R.S. [Re: howard]
CooperMan Offline

Talk Morgan Regular

Registered: 19/11/15
Posts: 547
Loc: Yorkshire
Didn't Librands develop a Wishbone front end for the trads some years ago ?
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#551634 - 04/01/19 09:21 AM Re: I.R.S. [Re: CooperMan]
Max5 Offline

Talk Morgan Regular

Registered: 02/05/11
Posts: 869
Loc: Ayrshire
Yes, there was a double wishbone front suspension set-up available at one time and I know of at least one example north of the border. I am not sure that owner was totally convinced of its advantages,(Andy?) especially in light of the costs involved. It was also before the five-link rear suspension was available and I think that it would have highlighted the limitations of the standard rear set-up. With a five-link rear it could be more effective.

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