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Old 05-24-2020, 03:28 AM
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Jag IRS Mountung Method Ideas.

I am just wondering if anybody has pic's of a neat way to mount a Jaguar IRS setup.

I guess like most folks I am seeking a simple, slender and clever way of attaching it to a Model A chassis but of course I will consider all pic's as they may still provide insight as t how others have done stuff.

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Old 05-24-2020, 06:03 AM
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https://www.bing.com/search?q=Mount+...&setlang=en-US
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Old 05-24-2020, 06:53 AM
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I purchased the plans for a 1915-25 T chassis from California Custom Roasters that includes a section on installing a Jag IRS. Very detailed bracket and component drawings were provided. They also offer the parts for sale as well. I did purchase most of the components and was very happy with the quality of them. Presently Im dismantling the Jag IRS that Ill putting under mt T sedan delivery. If you have excess to late 70s to early 80s Street Rodder magazines there are several excellent how to articles on mounting Jags.
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Old 05-24-2020, 02:57 PM
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some info from 2007

https://www.hotrodders.com/forum/inf...nd-106275.html

https://www.hotrodders.com/forum/jag...nd-208865.html

Hi adtkart, I went through and researched before putting a Jag IRS in my 38 dodge pickup, here's what i found:
Body style XKE-1960 to 63........53.25" wheel flange to flange......Series I
-1964 to 67........53.25" .....Series II
-1968 to 70........53.25" .....Series III
XKE V12 -1970 to 74........56"
3.8S -1960 to 69........56"
XJ6 -1969 to 73.........61.75" ....Series I
-1973 to 79.........61.75" ......Series II
-1979 to 88.........61.75" ...........Series III
XJS -1976 to 87.........61.75"
I was told to stay away from anything newer than 86. I can't remember why.

Last edited by timothale; 05-24-2020 at 03:06 PM.
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Old 05-24-2020, 03:19 PM
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jag irs

I did the search here on hotrodders for jaguar irs and reposted some of the info. The xke and sedan pumpkins are mounted at different angles . The CCR plans have both patterns I copied the plans about 15 years ago, laminated them then used the optical plasma at the college. there was some distortion in the copied pages..This time I used the CCR plans which are split on 2 pages and drew the front cross link on one page. We cut up the Jag mounting cage and used them for drill templates. The CCR plans hav the pumpkin bolted to a steel cross member. Snow white had a mount that use poly bushings with a thru bolt. I have seen some cross members that have slots so the upper coil overs can be adjusted inboard to soften the ride.
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Old 05-24-2020, 03:52 PM
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Thanks guys, this is the kind of info I am seeking.
I looked at the CCR site and had hoped to see a little more detail of the mounting, but mostly only found pic's of the brackets. I noted the angle of the pumpkin, which is obviously important.
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Old 05-24-2020, 05:28 PM
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Correct me if I'm wrong but the center section is hard mounted i.e. it will not move up and down as power is applied. So, lets say the engine/trans line is 2 degrees down so the pinion angle should be 2 degrees up. The universals need to work a bit and, because the engine/trans/rear center section are bolted solid (almost) these angles will not change.
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Old 05-24-2020, 07:26 PM
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Sound right to me.
I saw some time back a poly pumpkin mounted method, but did not keep a copy.
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Old 05-24-2020, 08:49 PM
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jag irs

The ccr plans use a longer front Tie bar that the ends are bent up and 7/8 dom tubes with clevises to help support the front lower part of the pumpkin. The outboard jag struts are usually discarded. just use the tube sleeve and rubber bushings. The CCR plans use tubing hairpins to keep the outboard end of the hub carrier from moving fore or aft. The stock Jag used a lot of rubber mounts to give a quiet easy ride. Back in the day the XKE racer cars eliminated most of the rubber to give more precise and predictable handling. . Most of the Irs setups I have seen did not have the stock bottom plate reinstalled. I plan on keeping it... is mostly out of sight. a lot of plans show using longer bottom links from the outside of he hub carrier angled inward toward the center and in aligned with the lower wishbone pivot points spacing. by using the stock sleeve and rubber bushing there seems to be enough flex. and again most rods are not road racing.
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Old 05-24-2020, 08:57 PM
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fifty V8 pm me

Paul gibbs sent me several pages of Jag info a while back,,,, PM me with your Email and I will foreward the info to you
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Old 05-24-2020, 09:34 PM
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I appreciate your comments and info.
The one thing that did impress me about the CCR stuff, was actually that trailing arm system that they use. I see that as something I would seriously consider in my build.

My build is a little way off as yet, but I am getting parts together.
It is a T Coupe body which I have and it is in excellent to perfect condition and I have already had a full steel roof installed and the firewall reversed.

I have been collecting body and trim stuff for a while now and have pretty much all those kind of items and now have turned my attention to the chassis and running gear.
From day one I had expected to sue a Jag IRS setup.

My main concern is keeping it as a full fendered hot rod that sits as low as possible but still with functional suspension etc.
T coupes can look a little high off the ground from the rear view in my book...

Hence my questions about mounting the Jag IRS to a chassis which I have not got yet.
My first thought was a T coupe on a Model A chassis which has been done before obviously, otherwise it may need to be a home made chassis, but still the need to figure out the best IRS install method to keep it low and slender in the chassis without losing all the trunk space etc.
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Old 05-24-2020, 09:45 PM
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I just found this Jag IRS setup which is to my liking, but what I can not get my head around is the pumpkin is on poly mounts yet the other angled struts are solid mounted is there any point doing that???
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Old 05-24-2020, 10:44 PM
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mounting

the poly mount might help on noise damping I see a couple heim rod ends forward of the pumpkin not connect to anything yet . The crossmember has poly mounts to the frame rails...on torque the front of the pinion wants to lift , the poly would allow some movement. The CCR plans have front connections on the cross connection angled up to control pinion lift. the ones in the pict at the rear would control rotation looking down but very little uplift control.

Last edited by timothale; 05-24-2020 at 10:49 PM.
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Old 05-25-2020, 10:44 PM
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Thanks for the explanation timothale, I can appreciate what you are saying now.
I will be fabricating all my own brackets etc, but looking at what others have done is always a big help for a rank amateur.

I have made a jig in anticipation that will allow me to shorten whatever lower arms I acquire to a width that will be compatible with a Model T/A track width.

I also have a buddy who can help me with shortening the half shafts.
We have found a couple of pic's that give a good idea of how to do it properly.
He has a decent sized lathe that we can use to get the job done.
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Old 05-29-2020, 10:25 AM
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When I built The Judge I used the Snow White assembly to mount my Jag rear end. I also replace the front of the frame with an S10 front clip. The following two links will take you to rebuilding the Jag rear end Plus what it took to get it narrowed and mounted. You might note that I erred in the first mounting and had to cut everything loose and rotated 4 degrees as I recall. Keep us posted on your progress!

https://49fordcoupe.smugmug.com/Rebu...-Jag-Rear-End/

https://49fordcoupe.smugmug.com/Building-the-Frame/

And here is a link to my full website. Lots of stuff there.
https://49fordcoupe.smugmug.com/
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