Steering, Suspension, & Brakes

tips, technology, tools and techniques related to non-driveline mechanical components

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Gary
Gary McMenamin

(1 posts)

Registered:
09/29/2013 01:37AM

Main British Car:


Narrowing a Jaguar IRS
Posted by: Gary
Date: September 29, 2013 01:52AM

Hi Guys,
I have been surfing around your site and must say that it has encouraged me in the project I'm about to embark. I have just bought my first MG roadster, a 63 model with Rover 3.5 V8 installed. I need to do a rebuild as it has been neglected some what. I'm planning to install the 1977 model XJ6 rear suspension which I have.
Does anyone have any information on how to shorten the width of the suspension? maybe a link to another site.
Any help would be most welcome.
Cheers for now..
Gary


(Moderator split this from another thread, gave it an appropriate title, and moved it to the correct sub-forum.)



Edited 1 time(s). Last edit at 09/29/2013 02:46AM by Moderator.


Moderator
Curtis Jacobson
Portland Oregon
(4495 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

authors avatar
Re: Narrowing a Jaguar IRS
Posted by: Moderator
Date: September 29, 2013 02:52AM

Welcome to the forum! Sounds like you've got a great project. Good luck with it.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6070 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Narrowing a Jaguar IRS
Posted by: BlownMGB-V8
Date: September 29, 2013 11:22AM

If you don't mind some reading you could do worse than the MG-Roadmaster thread:
[forum.britishv8.org]
There's also the 340 build thread:
[forum.britishv8.org]

Those are pretty detailed. There are some other very good threads on here as well.

Jim


Richard/SIA
Richard Brengman
No. Nevada
(396 posts)

Registered:
01/17/2014 07:47PM

Main British Car:
1969 Triumph GT6+ 225" Buick V6

http://irsforum.boardhost.com/viewforum.php?id=1
Posted by: Richard/SIA
Date: January 27, 2014 02:51AM

ALL about IRS conversions and narrowing.

Lots of Jag. info.

[irsforum.boardhost.com]


socorob
Robbie
La
(173 posts)

Registered:
09/17/2009 04:42PM

Main British Car:
1963 Sunbeam Alpine Series 2 Ford 2.8 V6

Re: Narrowing a Jaguar IRS
Posted by: socorob
Date: January 31, 2014 10:07AM

There was a wheeler dealers episode, I think it was one about a cobra kit car where they narrowed a Jag IRS somewhat. It was by using a mix and match of parts from different years mainly and it made it narrower, but not sure it would have been MG narrow. Edd mentioned what parts he used to do it.


Dan B
Dan Blackwood
South Charleston, WV
(976 posts)

Registered:
11/06/2007 01:55PM

Main British Car:
1966 TR4A, 1980 TR7 Multiport EFI MegaSquirt on the TR4A. Lexus V8 pl

authors avatar
Re: Narrowing a Jaguar IRS
Posted by: Dan B
Date: January 31, 2014 01:31PM

Using the S-type axles shortens it by 17mm. [www.youtube.com]


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6070 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Narrowing a Jaguar IRS
Posted by: BlownMGB-V8
Date: January 31, 2014 06:15PM

Looked like a lot more than that to me.

Jim



DiDueColpi
Fred Key
West coast - Canada
(1309 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
I really thought that I'd be an action figure by now!

authors avatar
Re: Narrowing a Jaguar IRS
Posted by: DiDueColpi
Date: January 31, 2014 07:05PM

I think the real # is 70mm which is 7cm or 2.75 inches.
And that is per side. So a total reduction of 5.5 inches.
Not sure that that is narrow enough but it is a significant change.
Cheers
Fred


rficalora
Rob Ficalora
Willis, TX
(2740 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

authors avatar
Re: Narrowing a Jaguar IRS
Posted by: rficalora
Date: January 31, 2014 07:24PM

I think it was more like 70 than 17mm. What's the width of the XJ6 IRS? 70mm per side would narrow it about 5.5 inches.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6070 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Narrowing a Jaguar IRS
Posted by: BlownMGB-V8
Date: January 31, 2014 09:32PM

That seems much closer to what we see in the video.
Now here is the fun part. That is 1/2" more than I narrowed the XJ6 RE for installation into my roadster and the MG-Roadmaster or 1/4" more per side. Using stock parts. The pinion will not be centered in the transmission tunnel but depending on the diameter of the driveshaft and how much the handbrake bolt is dressed down it should be usable. The uprights will have to be trimmed a bit more closely but that should work out too. You'd still need the 3" flares but might be able to get by with 2-1/2 or even 2" depending on your choice of wheels and tires. And you could still get that wonderful 8" of wheel travel.

Jim


Joyridin'
Ron Z

(12 posts)

Registered:
04/29/2014 12:53PM

Main British Car:


Re: Narrowing a Jaguar IRS
Posted by: Joyridin'
Date: May 04, 2014 05:25PM

You need to find the E type Series 1 or 2. They are 50" across.


TR6-6SPD
Ken Hiebert
Toronto Ontario
(252 posts)

Registered:
04/23/2008 11:43AM

Main British Car:
1972 TR6 1994 5.7 L GM LT1

authors avatar
Re: Narrowing a Jaguar IRS
Posted by: TR6-6SPD
Date: May 04, 2014 07:50PM

I'm using one from a 1965 XKE Series I and it measures 53 1/8" hub to hub.

IMG_6416.JPG


Joyridin'
Ron Z

(12 posts)

Registered:
04/29/2014 12:53PM

Main British Car:


Re: Narrowing a Jaguar IRS
Posted by: Joyridin'
Date: May 05, 2014 07:43AM

That is probably correct. They are saying the "track" width is 50", but I measured mine and it is 53" also.

Pretty narrow considering.


Jim Stabe
Jim Stabe
San Diego, Ca
(800 posts)

Registered:
02/28/2009 10:01AM

Main British Car:
1966 MGB Roadster 350 LT1 Chevy

authors avatar
Re: Narrowing a Jaguar IRS
Posted by: Jim Stabe
Date: May 06, 2014 06:47PM

When I put the Series 1 XKE rear in my roadster back in the early 70's I had to take 1 1/4" out of each side to fit the wheel offset that was available then. Now you can get wheels with a lot more backspace and you should be able to run it without narrowing. The XKE cage bolts into the the B like it was made for it. It only took me an afternoon to have it all mounted once the battery boxes were removed. I bolted mounts through the short shelf at the front of the trunk into the rear of the cage top and made brackets that bolted the front of the cage to the shock mount holes. You have to be careful to pivot the trailing arms from the same axis as the inner pivots of the lower suspension arms, it will bind if you don't. As I recall the stock early gas tank won't fit with the Jag rear, I replaced mine with one from a Ford Falcon but I'm sure there are others that would work as well.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6070 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Narrowing a Jaguar IRS
Posted by: BlownMGB-V8
Date: May 07, 2014 10:14AM

That sounds right. On the RM and my roadster we had to dimple the tanks and the full cage would be worse. The tank has an internal baffle which complicates just bending it for clearance. You have the advantage of the OEM isolators which are pretty good but will probably have to adjust the ride height so that there is room below the frame rails for the knuckles, I'm guessing you might have to raise the ride height a little in the process. But check it out, it could be ok. A 17" wheel will definitely clear the upright allowing you to use that offset to advantage. Some 16's might work. As a side benefit those rims will also allow your tire to go inboard of the front steering knuckle which will allow the use of wider tires and also reduce steering effort. Win-Win. 60/70s Camaro or Malibu hubs will match the lug pattern with vented rotors (Some machining is needed, change out the studs to match) and Dodge Dart calipers match up well enough with slight ovaling of the mounting holes. Brake pads don't match perfectly but plenty good enough. We run those on the RM.

Jim



Edited 1 time(s). Last edit at 05/07/2014 10:17AM by BlownMGB-V8.



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