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Thread: Jaguar IRS in an MGB

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  1. #21
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    Re: Jaguar IRS in an MGB

    No secret, British V8 site Roadmaster sticky,Evan Amaya Jag IRS, Daze Mustang Jag IRS parts I,II,III,and IV. I've also seen the one Tony mentioned from the guy in England.Also Pete Mantell just put one in a MGB with LS Chevy V8.

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    Yoda rick_ingram's Avatar
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    Re: Jaguar IRS in an MGB

    Quote Originally Posted by Camshaft
    I don't intend to use flares...I was planning on cutting the thing down, as I've seen a couple MGBs with stock track widths running narrowed Jaguar IRSs. But no-one seems to be willing to share the secret!
    Contact Jim Blackwood and take a look at the Roadmaster sticky on British V8.

    Attached is a photo of the diff we installed into the Roadmaster project. Jim is to the left; Pete Mantell is to the right. Pete's hand is near the mounting bar used on this bolt-in unit for the MGB.
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    Rick Ingram
    1978 MGB - 1969 MGC - 1974.5 MGB/GT V8 conversion - 1968 MGC - 1972 MGB

  3. #23
    Jedi Knight equiprx's Avatar
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    Re: Jaguar IRS in an MGB

    I'm building a replica XK 120 OTS with all 1994 XJS six cyl and running gear. I don't know if any of it will fit. One issue is wheel track. Inside the replica rear wheels is 64" and it will have spats (wheel covers). I'm expecting to have special steel wheels made with a large offset to narrow the wheel track. I'm just curious if that will be enough or if I'll have to cut and weld the suspension.
    Steve D'Angelo
    Pacifica, CA 94044

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    Re: Jaguar IRS in an MGB

    There are 2 pictures of the Roadmaster type Jag IRS in my Gallery.

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    Jedi Warrior bill_young's Avatar
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    Re: Jaguar IRS in an MGB

    One problem we ran into on the Roadmaster project was in using a rear from a later model Jag instead of the earlier E type or other sedans of that era. The later cars used larger diameter wheels and the outer hub carriers won't clear 15" wheels unless you have quite a bit of offset and that means fender flares for sure. If you're trying to tuck everything inside the stock body lines then it's either an early style unit or something like the custom units built by Hoyle as Larry Shimp did https://www.britishv8.org/MG/LarryShimp.htm or the unit built by Todd Budde that he used in his car. https://www.britishv8.org/MG/ToddBudde.htm
    About the only way to get a late Jag to fit without flairs would be to actually notch the rear frame rails in order to get the hub carriers inboard a few inches more. That's a lot of work for sure.
    I've seen Jim's work on the Roadmaster project and it's very good. Don't go by the visual look of his welds on his car as shown in the newsletter, those were mostly done with gas or a stick welder, he's now working with TIG and MIG and has much better looking results. His engineering though is top rate IMHO. Well thought out and designed parts that are quite strong enough to do the job.
    "There is a fine line between a "hobby" and "mental illness".

  6. #26
    Jedi Knight Camshaft's Avatar
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    Re: Jaguar IRS in an MGB

    Okay. So I'd have to go with something older than a '92 to make it work, eh? How old are we talking?

    1974 MGB / 1978 MG Midget / 1986 Oldsmobile Cutlass Supreme Brougham

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    Great Pumpkin tony barnhill's Avatar
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    Re: Jaguar IRS in an MGB

    Bill - I don't think either of those guys used Jaguar rear ends.
    <span style="font-weight: bold"><span style="font-style: italic"><span style="font-size: 14pt"><span style="font-family: 'Comic Sans MS'"><span style="color: #006600"> Tony &quot;theAutoist&quot; Barnhill</span></span></span></span></span>


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    Re: Jaguar IRS in an MGB

    Tony, Thats right. The Hoyle used Ford Sierra (Merkur in US),Volvo IRS is similar,also Dana 30. Todd's IRS used Nissan R200 diff. I know what Bill meant about the newer Jags needing bigger and more offset wheels than the older XKE. I have a friend that has a Jag IRS in a T bucket with Buick V6. The large bell can be cut back to the notch on the bottom. When I was behind him I could see all 4 U joints spinning.He has 15" wheels. I think as long as it has the inboard brakes you can trim the bells and make it work without flares. You still want to shorten the lower arms and axle tubes. I think Jim shortened one side slightly more to center the pinion in the tunnel.The newer one with outboard brakes is a different animal all together. You should check out the websites we mentioned for more info.

  9. #29
    Jedi Knight Camshaft's Avatar
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    Re: Jaguar IRS in an MGB

    Thank you. I did notice how the axle was trimmed differently on each side, clever. What about swapping the knuckles out for the earlier type for clearance?

    1974 MGB / 1978 MG Midget / 1986 Oldsmobile Cutlass Supreme Brougham

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    Re: Jaguar IRS in an MGB

    I think 64-74 XKE and 65-83 XJ6 all use the same knuckle(bell). If you look close there is a notch on the bottom inside.Just trim up straight from there.

  11. #31
    Jedi Knight Camshaft's Avatar
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    Re: Jaguar IRS in an MGB

    Perfect! I picked the IRS up today. I'll get pictures tomorrow, hopefully.

    1974 MGB / 1978 MG Midget / 1986 Oldsmobile Cutlass Supreme Brougham

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    Re: Jaguar IRS in an MGB

    2 more pictures on shortening axles and control arms.

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    Jedi Warrior bill_young's Avatar
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    Re: Jaguar IRS in an MGB

    Tony, I know they didn't, as I said, those were alternatives if you weren't using an early Jag IRS and wanted to keep the tires inside the stock MGB sheet metal. The clearance issues we found were where the lower control arm bolted on, the width of that portion was the real source of interference with the wheel. If you could narrow that a bit you could probably fit a 15" wheel to the carrier.
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    &quot;There is a fine line between a &quot;hobby&quot; and &quot;mental illness&quot;.

  14. #34
    Jedi Knight Camshaft's Avatar
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    Re: Jaguar IRS in an MGB

    Jim, Tony, Bill, everyone...thank you so much for all of your help and input. It'll be a slow process, but ultimately, a rewarding one.

    1974 MGB / 1978 MG Midget / 1986 Oldsmobile Cutlass Supreme Brougham

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    Re: Jaguar IRS in an MGB

    You're venturing into a new area.....lots of photos, lots of detail.
    <span style="font-weight: bold"><span style="font-style: italic"><span style="font-size: 14pt"><span style="font-family: 'Comic Sans MS'"><span style="color: #006600"> Tony &quot;theAutoist&quot; Barnhill</span></span></span></span></span>


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    Re: Jaguar IRS in an MGB

    Camshaft, What year is your IRS? Any pictures?

  17. #37
    Jedi Knight Camshaft's Avatar
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    Re: Jaguar IRS in an MGB

    It's from a 1992 XJS, Jim. No pictures yet.

    1974 MGB / 1978 MG Midget / 1986 Oldsmobile Cutlass Supreme Brougham

  18. #38
    Great Pumpkin tony barnhill's Avatar
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    Re: Jaguar IRS in an MGB

    That's not from an XJ6...its from an XJ40....believe there's some differences in them.

    I know the hot rodders want the earlier ones ending in '87.
    <span style="font-weight: bold"><span style="font-style: italic"><span style="font-size: 14pt"><span style="font-family: 'Comic Sans MS'"><span style="color: #006600"> Tony &quot;theAutoist&quot; Barnhill</span></span></span></span></span>


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