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  1. #11
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    Whilst planning the chassis I'm thinking about seat and belt mounts. As the B pillar is so slim I'm not gonna get a belt mount on it. Not wanting to put a roll cage in it I had a look about and came up with Ford Bmax seats. They have a built in seatbelt and they just about fit.
    What's more of a suprise is that the rear ones fit with no modification at all!


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  3. #12
    I'm a grown up member now !
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    So, we're almost up to date. I've been making threaded bushes to weld in to chassis rails, and some other plain bushes that are being used to make the front and rear suspension jigs. Whilst I've measure everything, it's usefull to have jigs to ensure I'm bang on. Oh, forgot to mention, I narrowed the original mazda front suspension subframe by 80mm to give me a narrow front track allowing the wheels to tuck up under the front arches and still turn.

    Plan is to get everything cut then assemble a giant jigsaw and hope that it's braced enough not to warp when I start welding it!
    Last edited by AustinHarley; 09-11-2020 at 14:34.

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  5. #13
    Official RnS Addict 296moon's Avatar
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    Very nice build, following.......................

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    Bookmarked!

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    Love it!
    Im fond of an old British car getting rodded.
    Will be watching, keep your progress pics coming!
    "The one who watches the wind will not sow seed, and the one who looks at the clouds will not reap" - Eccl 11:4

  9. #16
    I'm a grown up member now !
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    Gathering up some of my thought processes;

    This is being built to go through BIVA, so some compromises have to be made. The modern seats are a little out of character, but it removes any seatbelt mount issues. Hopefully I'll be able to remove the side airbag without unstitching anything.

    MX5 as a base... surely a V8 would be the thing. Yes, for sound. But power? Standard its 148hp, and they regulary turbo to 250-300. It's got an LSD and 6 speed box, it's double A arm suspension, and if I use enough of it I might get an age related plate. An age related can have a private plate on it, so I can go with something that looks right on the car.
    It's a daily cruiser that'll be simple to fix, and won't embarass itself in modern traffic.

    Paint. I love it as it is, everything you see is surface rust- bar a little perforation at the bottom rear edge, and the sheet metal between the running boards and the frame. If whatever finish I put on there degrades over time then I'll have to paint it.

    Wheels and tyres, I wanted wires of a similar rolling diameter as the originals (about 30 inches). But having the mazda 100mm pcd kinda limits options. Gearing would be a problem as well. I've gone with a 205 45 17 on the front, and a 225 65 17 on the rear. This gives me the tall sidewall look I was after and just about fills the arches. Can't go wider as I'd have to tub it and maybe shorten the driveshafts. I think there's 5mm a side I can save by using the early uprights and shafts. Maybe.
    Gearing. The crownwheel and pinion are used in the Kia Sportage, in ratios (4.67 or something like that) that will just about get me back to stock.

    Gear shift is way too far into the car- it's a long box, but I think I can shorten the mech about 200mm which might help. It'll have a tall lever on it anyway, probably bent about to clear the seats, which touch in the middle.

    Chassis design. I'm making it up as I go along- although the main drawings took me several weeks of messing about. The stock mazda dimensions are not easy to come by- much of the info you can find is just wrong.
    The dual rail design came about because I had 200mm depth to play with. The deeper the rail section, the stronger it is. Two lighter rails give a similar benefit, plus they kinda form a triangulated structure as the lower rails sit much closer together than the uppers. Upper rail is 50x50x2.5, lower is 48.3x2.5. I went round for the lower as I thought I'd have to cut each brace to fit and it would be simpler to fishmouth the round one then rotate it into place. It's round. I'm happy with it. I think. Too late now... move on.

    External radius compliance. Mmm.
    Wings are ok.
    Hinges bad.
    Bumpers nope (not for the test anyway), will have to be fabricated round tube.
    Suicide doors- need latches and warning buzzers. Handles, have to return to within 2mm of the door. I'll have to make something.
    Lights, need something similar to standard (10 inch+)?
    Wiring and dash- all Mazda sourced and modified to fit.

    That's the stuff that's been rolling around in my head for the past few months! There's probably more.

    Before Xmas progress plan is to get the chassis tacked together, with the A arms on, so I can drop the body on it and do some head scratching.

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  11. #17
    Official RnS Addict mygasser's Avatar
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    have you looked through this build mate? built then rebuilt to pass biva properly. https://www.rodsnsods.co.uk/forum/garage/my-pop-165
    need a job done on your project? i may be able to help.

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    Official RnS Addict 28Chevy's Avatar
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    Subscribed, as long as you keep the glass visor..
    Whirrr whirrr chuff chuff de chuff........chuff......BRUMMMM!

    My Chevy thread: https://www.rodsnsods.co.uk/forum/sho...y-coach-403745
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  13. #19
    I'm a grown up member now !
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    Quote Originally Posted by mygasser View Post
    have you looked through this build mate? built then rebuilt to pass biva properly. https://www.rodsnsods.co.uk/forum/garage/my-pop-165
    Morning Neil, as you can see, I've made a start. Couldn't post on here for a while- combination of lost password and my other pc not showing bits of the forum properly.
    Gonna have to read the pop thread in the evenings- I can't see my thread being 150 pages long! I'll have given up or finished before that.
    Most of my Biva issues will have already been addressed by other people, so I'll be looking at what other people have done. I read the BIVA section on seats and seatbelt mounts last night. It doesn't actually clarify what a 'thin walled tube' might be. I'm planning on M12 bushes though the 50x50x2.5 box section- with some extra braces. I might locally thicken the rails with some 3mm plate where the bushes are welded top and bottom.

  14. #20
    I'm a grown up member now !
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    Quote Originally Posted by 28Chevy View Post
    Subscribed, as long as you keep the glass visor..
    Glass visor is probably a BIVA issue so it won't be appearing on the first incarnation of the car. But something very similar might be a future improvement. Same with the sidelights and the rear luggage rack.

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