Austin 12
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  1. #1
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    Austin 12

    Morning, thought it was about time to try and post a build thread. Sorry if you're reading this in 2022 and it's not finished yet!

    Here it is then, a 31 Austin 12.




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  4. #2
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    This thread will be shortlived if the photo upload keeps throwing me out!

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    Nope, browser crashes each time I upload a picture!

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    right I have a few photos now;
    Forstly, the rules;
    No body mods, I want to keep the paint as it is (apart from a clearcoat or oil).

    Running gear- For a while I considered Scimitar, but the outriggers would have prevented the body sitting low enough, and the rear of the chassis would have to channel into the body.

    Eventually settled on MX5, I can work with the standard track, and use the subframes complete onto the original (modified) chassis.

    I then discovered ProLaminates had MNR sportscars build a chassis for their 34 bodies. Same wheelbase and track. After some to and fro, I got hold of one

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    This isn't my actual chassis, I don't have a picture of mine but it's the same. Nicely built, but as you'll see in a few posts, ultimately not to be used on this project.
    Last edited by AustinHarley; 09-11-2020 at 14:43.

  9. #6
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    So, next thing was to get the Austin sitting where I wanted it. I got hold of some old Rover wheels. They have the same PCD as Mazda and the offsets work so they'll do for mocking up.
    Standard;


    and dropped down on the wheels;

    Last edited by AustinHarley; 09-11-2020 at 14:31.

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    I then got hold of an MX5 and stripped the suspension, engine, and box from it. Lots of measurements on these and the MNR chassis made me rethink.
    I'd have to move so much stuff on the MNR chassis (A and B posts, remake the A arms that don't fit properly, etc) that it's going to be easier to make my own chassis.

    While the original chassis was in good condition, it was only 40mm by 90mm. I could have boxed it but it's less effort to make new rails as they're flat with just a kink at the end.
    I realised that I had so much depth between the floor and the bottom of the running board I could get a pair of parallel rails in there, set 200mm apart.
    Here's a confusing 2d drawing;


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    from that drawing I projected out the braces that join the top and bottom rails together, and check they kinda worked with a paper template;



    So, off to the cnc mill (yep, I've got a few very useful tools) to cut all the braces;


  12. #9
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    There were some bits I found it quicker and easier to have laser cut. I also had some jigs made that hold the rails in the right place and locate the A arm brackets;



    These braces attach to the orginal body mounts. Nice that my drawings match up with the old chassis so far


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    body stripped and arranged on the 4 post so I can roll the chassis under it easily


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