HyperSprint a-arm question

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HyperSprint a-arm question

Postby tenaja » Wed Mar 20, 2013 7:40 am

Tony,
I'm rebuilding a lower rear a-arm. On the upright, the a-arm mounting point measures 130mm wide. The lower a-arm hiem joints are 129.4mm apart--a lot of preload, making it a squeeze to get onto the upright.

So, my question is if that was stretch intentional? What is the ideal tolerance range? (How close to "exactly" 130mm should I shoot for? Obviously, with a h'sprint, I have to make a new jig (since there were no a-arm plans), and, also obviously, the old one worked fine, but I'd like it to be as close to "perfect" as possible.

BTW, on a slightly related subject--why did you make the PIRCV a-arms shorter than the hypersprint a-arms? I was comparing mine to the PIRCV plans, and was surprised by the length difference.

Thanks
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Re: HyperSprint a-arm question

Postby Tony » Wed Mar 20, 2013 11:09 am

The arm should be the same as the upright.
Its not designed to stretch.
129.7 to 130.3 would be acceptable.
You may have a version of the Hypersprint that was fitted with Holden CV's & axles.
With adaptor hubs from the spline to CV's.
Thats why the arms are long, to get the axles in there.
The later Hypersprints were exactly the same as the Barracuda.
"There can't be a practical reason for believing in what isn't true" – Sir Bertrand Russell.
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Re: HyperSprint a-arm question

Postby tenaja » Wed Mar 20, 2013 12:50 pm

Thanks, I really appreciate the input on the tolerances. And it is not a CV, it was an earlier model originally with PTO axles.
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Re: HyperSprint a-arm question

Postby Tony » Wed Mar 20, 2013 4:00 pm

Then the arms were much shorter on the older uni joint type.
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Re: HyperSprint a-arm question

Postby tenaja » Thu Mar 21, 2013 6:03 am

Interesting. Even though mine are the old uni joint type, they are still longer than the PIRCV drawings, by about 10 or 20mm IIRC.
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Re: HyperSprint a-arm question

Postby Tony » Thu Mar 21, 2013 10:38 am

That was a very long time ago.
Not sure on exact lengths.
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Re: HyperSprint a-arm question

Postby tenaja » Thu Mar 21, 2013 11:29 am

I figured.

Sure appreciate the tolerance information.
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Gadget

Postby GlocKKisy » Tue May 21, 2013 12:40 am

I congratulate, you were visited with a remarkable idea
:)
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