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  #61 (permalink)  
Old 06-16-2020, 05:41 AM
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I decided to set both engine/ trans and the Jag diff parallell with the road surface.
Have worked well for 7 years now.
If that wear out the joints earlier, I'll deal with that when/if it happens.
And if the trans output have a different hight than the diff input, you still achieve the desired joint movement.

I think it's important that the cars suspension movement is 90 degree to the road surface when seen from the side of the car.
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  #62 (permalink)  
Old 06-16-2020, 07:07 AM
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suspension movement.

Staleg nailed it
"I think it's important that the cars suspension movement is 90 degree to the road surface when seen from the side of the car. "

Fatman's SEMA HRIA video's linked earlier in all this discussion have it all graphed and explains the suspension design

I think Fatman has 4 videos on suspension.
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  #63 (permalink)  
Old 06-16-2020, 08:24 AM
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Can a universal joint angle be achieved by a side angle instead of a vertical angle should the pinion not be in a central line with the transmission.

Obviously with the Jag IRS neither end of the drive shaft is moving since the diff head is mounted to tye frame...
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  #64 (permalink)  
Old 06-16-2020, 09:15 AM
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drive line chart

Spicer's website has been updated but I think this has the info
UP, Down Left right. the old chart showed how to calculate true operating angle for any direction or combinations.
the crankshaft- trans center lines and the pinion centerline must be parallel. off set can be up or down or side but parallel Some of the us Vans have engine off set for driver leg room . I have never gone thru the multiple drive line used in some large trucks to understand what they are doing.

https://spicerparts.com/calculators/...gle-calculator

Last edited by timothale; 06-16-2020 at 09:42 AM.
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  #65 (permalink)  
Old 06-17-2020, 02:58 AM
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Thanks for the info guys.
You do drive shaft angle so few times in your life unless you work in the business that even knowledge gains seems to drain out after a couple of years.

A lot of hot rod stuff that I have learned has made me an expert for a couple of weeks and then I never use that knowledge again and it gets diluted down to nothing eventually.

I am just wondering what pertinent questions I can ask while we are all on a roll with this Jag IRS stuff.
I always like to leave a foot print for other who follow and here is hoping some our discussions will help other out later.

It sure beats seeing folks make the same mistake over and over...
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  #66 (permalink)  
Old 06-18-2020, 06:23 PM
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A quick question regarding those front and sometimes rear bracing struts.
What size material is suggested???
Are the urethane ends a similar size to those used on hot rod 4 bar or hairpins ends???
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  #67 (permalink)  
Old 06-19-2020, 07:30 AM
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Parts and pieces

Welder Series Inc. sells hot rod parts and weld it your self stuff. They also have a lot of bits and pieces on their handy parts area of the catalog.. They sell two sizes of urethane bushings kits and the outer tube to make your own 4 bar kits, etc. I had my local welding shop and steel supplier get me some 7/8 dom tubing. not special order but with their next order so I did not have to pay extra shipping. I also talked to a shop that builds 4 X 4 rock climber Jeeps and trucks . He said he usually has several sizes of Dom tubing in stock.
most of the small pieces that Welder series carries is reasonably prices. It would take me more time to find the right size material and get set up than it is worth to make my own.

Last edited by timothale; 06-19-2020 at 07:36 AM.
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  #68 (permalink)  
Old 06-19-2020, 10:23 AM
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Have been following along with this thread as I prepare to install a Jag IRS under my Model T. Have the IRS disassembled and sorting out the pieces to rebuilt, painted, polished and chromed. I will be using the CCR mounting pieces with QA1 coil over shocks. Since the hub carriers are aluminum, I started sanding the rough casting and will proceed to polish them myself.
I think they will turn out pretty nice with a few hours of work.
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  #69 (permalink)  
Old 06-19-2020, 01:00 PM
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tack shock mounts

My son had problems getting the upper jag coil over bolts in. On the one we are working on now I will just tack the CCR shock mount in then fit the upper bolt and check the fit before final welding. I use horse shoe nails for adjustment. they are mini wedges. I just tack one side then check alignment
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  #70 (permalink)  
Old 06-20-2020, 06:48 PM
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Thanks Tim for that info.
I will save that link.
I am sure there are some items there that will interest me in the near future.

Right now I am trying to source the correct size sleeve tube for shortening drive axles.
I've machined sleeves for shortening the lower arms and have a jig made ready for the welding etc.
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  #71 (permalink)  
Old 06-30-2020, 10:42 AM
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I just score one of these style Jag IRS and I am now wondering how one would go about installing it?
The coils are massively strong looking and sit in cups on the lower arms.
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  #72 (permalink)  
Old 06-30-2020, 11:02 AM
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Looks like an X300. Totally different from just about everything on this thread . You may as well start a new thread. Nothing discussed above applies.
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  #73 (permalink)  
Old 06-30-2020, 11:33 AM
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I looked at that style Jag and it appears it would lend itself to replacing the coils with air bags.
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  #74 (permalink)  
Old 06-30-2020, 03:53 PM
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A buddy of mine suggested cutting off the lower spring cup and using a sing coil over unit.
I am not changing direction and will still follow my earlier directions, figured I'd throw this in to the brains trust we have here now for thoughts only.

That single coil is really a heavy duty piece...
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  #75 (permalink)  
Old 07-01-2020, 07:10 AM
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custom IRS

almost 20 years ago I saw a custom Irs in A T bucket. The guy used the Ford components with his own design of tubular A arms. A person could get the pieces from what you have. Either copying that geometry, designing it all new. In the video I linked to from Bruce Camber , the retired head of Ford racing. He discussed what he was able to do. Here's a link to a guy building his race car and the geometry involved. He has posted a lot ov Youtubes.
years ago I put a drag race rear suspension under the rear of my willys and it got scarey on the road around corners. The first video is about the front but others do the rear and front to rear balance for handling.
The Jag XJ6 and common Irs we normall look at doesn't do more that move up and down. The modern design suspensions have a camber curve and toe change during movement and the Video series I linked to goes thru what happens and why.

Last edited by timothale; 07-01-2020 at 07:21 AM.
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