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Thread: Jaguar IRS in an MGB

  1. #1

    Jaguar IRS in an MGB

    Monday, I'm trekking to Elyria to pick up a Jaguar IRS for $200. It's coming from a '92 XJS. Has anyone here installed one in an MGB?

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

  2. #2
    Yoda PAUL161's Avatar
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    Re: Jaguar IRS in an MGB

    What's an IRS? Sounds like something federal.

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    Great Pumpkin aeronca65t's Avatar
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    Re: Jaguar IRS in an MGB

    Independent Rear Suspension. [img]<<GRAEMLIN_URL>>/grin.gif[/img]

    ~Here~ is an example.

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

    I've an acquaintenance in England who did the conversion - Nick Smallwood - he used to have a great site on how he did it, but apparently he's pulled it.
    <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>


  5. #5

    Re: Jaguar IRS in an MGB

    Jim Blackwood has a Jag IRS in his MGB V8.

    See http://www.britishv8.org/MG/JimBlackwood.htm

    We put a Jag IRS into the Buick Roadmaster project car. (MGB/GT with a 455cid big block Buick, T5 transmission, IRS, etc)

    See http://forum.britishv8.org/read.php?2,166,page=44

    (There are some really good shots of the unit and its install on this sticky..probably begins about page 30 or so.)

    Pete Mantell has an MGB in his shop right now with a Jag IRS. It will be receiving a Corvette LS3 crate engine.

    See http://www.mgexperience.net/phorum/read.php?40,1302586

    Yes...it is possible.
    Rick Ingram
    1978 MGB - 1969 MGC - 1974.5 MGB/GT V8 conversion - 1968 MGC - 1972 MGB

  6. #6

    Re: Jaguar IRS in an MGB

    Quote Originally Posted by rick_ingram
    Jim Blackwood has a Jag IRS in his MGB V8.

    See http://www.britishv8.org/MG/JimBlackwood.htm

    We put a Jag IRS into the Buick Roadmaster project car. (MGB/GT with a 455cid big block Buick, T5 transmission, IRS, etc)

    See http://forum.britishv8.org/read.php?2,166,page=44

    (There are some really good shots of the unit and its install on this sticky..probably begins about page 30 or so.)

    Pete Mantell has an MGB in his shop right now with a Jag IRS. It will be receiving a Corvette LS3 crate engine.

    See http://forum.britishv8.org/read.php?2,166,page=44

    Yes...it is possible.
    Thanks for the link.

    Given the overall build quality of Blackwood's car, I'm not too inclined to follow his advice...just sayin'!

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

  7. #7

    Re: Jaguar IRS in an MGB

    Quote Originally Posted by Camshaft
    &lt;snip&gt; Given the overall build quality of Blackwood's car, I'm not too inclined to follow his advice...just sayin'!
    That would be a mistake, in my opinion.

    Jim is a very good engineer. (In fact, it is one of his true professions) His car may not be to the likings many enthusiasts, but it is well thought out. For example, that rear spoiler adjusts with acceleration (ala the Chapparel of the mid 60's). He is a wiz at fuel injection, and understands most eveything mechanical and electrical. Take a look at the pictures in the Buick Roadmaster link that I provided...you'll see his work on the Jag IRS, which became a true bolt-in for the MGB and MGB/GT.

    I'll betcha if you e-mailed him, he would be MORE than willing to answer your questions/concerns over an IRS install into your own MGB.
    Rick Ingram
    1978 MGB - 1969 MGC - 1974.5 MGB/GT V8 conversion - 1968 MGC - 1972 MGB

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    Jedi Trainee davester's Avatar
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    Re: Jaguar IRS in an MGB

    When I see something like that I have to ask...why?
    '71 MGBGT, '65 Sprite (both owned since '73)

    It's a sickness, not a car hobby.

  9. #9

    Re: Jaguar IRS in an MGB

    Quote Originally Posted by davester
    When I see something like that I have to ask...why?

    Because it can be done.....and it's his MG.

    Rick Ingram
    1978 MGB - 1969 MGC - 1974.5 MGB/GT V8 conversion - 1968 MGC - 1972 MGB

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

    True, Jim's work isn't always pretty....but, take a ride in it &amp; you'll change your mind!
    <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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    Yoda TOC's Avatar
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    Re: Jaguar IRS in an MGB

    The XJ-S has a rear track of 57".
    The MGB has a rear track of 49-1/4".

    Unless you do what Blackwood did, and extend the fenders out, you will be faced with fabricating new upper and lower arms for the IRS and having new half-shafts made up.

    Probably some outfit that will do that for you......or already has.....but I think the $200 for the complete IRS is going to seem like spare change.

    Most likely an automatic, and if you have an auto in your MGBC (MGB Custom), okay.....otherwise, even more money to change the R&amp;P.

    Wonder with shorter shafts and arms, how much more frequently the u-joints will need replacing?

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

    Nick Smallwood in the UK grafted a GT fender flare kit onto his car when he installed the Jag IRS.
    <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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    Yoda TOC's Avatar
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    Re: Jaguar IRS in an MGB

    That's what I'm saying.
    If you want it to be hidden, yet provide better handling, you either gotta chop the sides of the IRS or add wing extensions.

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

    I just gave an XJ6 rear end to a friend who's building an old Chrysler Hot rod - he's installing one of the new Dodge hemi engines in it.
    <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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    Yoda TOC's Avatar
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    Re: Jaguar IRS in an MGB

    I think you missed my point.

    Try to fit that IRS under a stock-fendered MGB.

    Maybe if you trimmed the wheelwells way out and put rubber flaps on to make it legal....

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

    I don't think anybody ever thought about putting the IRS under a stock-fendered MGB....that's why we gave the examples of cars that have one also having flared fenders.

    And we all agree it is too expensive to modify the Jag IRS.

    We know it won't just slide up under a stock MGB body.
    <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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    Great Pumpkin DrEntropy's Avatar
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    Re: Jaguar IRS in an MGB

    I abstain.


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    Re: Jaguar IRS in an MGB

    Actually, The only reason for the flares are for the wider tires. Evan Amaya did the Jag IRS with no flares. It is narrowed to MGB width. There is an article on how to narrow one for an early Mustang on Daze's site. Jim has developed a practically bolt on version for the Roadmaster project. I uploaded a picture of it in my pictures.

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

    The only reason I brought it up was.....camshaft didn't mention flaring of fenders or narrowing of IRS.....it was really just a head's up sort of thing.

  20. #20

    Re: Jaguar IRS in an MGB

    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!

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

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