Thinking of building a Haynes Roadster

  1. AdrianH Forum Supporter

    Messages:
    1,720
    Location:
    On an Island
    If you want to build a Haynes Roadster then go for it and I wish you all the very best with the project.

    When I built mine I believe it was the 8th to be completed and the first to be put through the IVA, that was over 10 years ago. It was sierra based, well they were easier to get then and I still have the parts to build another, together with a completed chassis.

    Mine was done with the Sierra CVH engine, not very powerful as I think a rolling road only saw 105 HP, but it achieves around 4,500 miles per year and has caused me very little issues. Last week it got me from home down to the South coast and back again covering 1200 miles with no issues which is as it should be.

    The main thing to watch out for with the MX build is the rear differential snapping on the mounts. Phil at Talon once did a steel body for the MX diff to take it back like a sierra diff and I think if still doing them it would be an option to look at. On the MX5 and Eunos/Maita? cars the diff is secured to the engine/gearbox with a specialised tube or power plant frame PPF. It keeps everything lined up and stops a lot of rotational force on the diff . In a Seven style car when others have mounted the diff on the wing's and the two front mounts which are only on one side of the diff they end up snapping a wing off!

    This is not to put you off but to ask you to do research before hand, The Mazda engine is a good little power plant.

    Good luck with the build.

    Adrian
     
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  2. MattH

    MattH Member

    Messages:
    3,579
    Location:
    Bristol
    Great info Adrian thanks.

    I have seen that the main differences in the MX build is the diff mounting and shorter wishbones.
    The SSC frame design has a lot of changes and reinforcements for the diff.

    I might not even be beyond the scope of my build to design and build a new diff housing. I have all the machinery needed (CNC mill, build lathes etc).
     
  3. AdrianH Forum Supporter

    Messages:
    1,720
    Location:
    On an Island
    SSC was still going when I did my Sierra build and I had a few trips over to them in the North East to meet up with a few builders, eat bacon barm's etc.

    Have a look on the locostbuilders forum and do a search on MX5 diff problems or similar, and get a feel for the size of the issue, some snap some don't. I guess it is down to power and how they are treated, but the original SSC designs do not solve the issue.

    I would suggest mx5 engine/gearbox and Sierra diff and back end as per the book, but I am not sure if the rotational directions of the MX5 and sierra diff's are the same?

    I put my build on my webpages and then used that in printed format to send to VOSA to show self build, so do keep pictures and a build diary if you can as well as receipts etc.
    My build is still out there if it helps with idea's. I also went aluminium panels rather than all fibre glass but that is a personal preference.

    Adrian

    http://www.locostbuilders.co.uk/viewthread.php?tid=172866
     
    Last edited: Jul 11, 2019
  4. stuvy

    stuvy Member

    Rage offer a supermoto version of the off road buggy they even race them on circuits and rally cross not just off road

    It takes 15 to change the shocks and tyres and your from road to off road

    Just another option
     
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  5. stuvy

    stuvy Member

    Really, why!? Iv raced one and there epic with the fire blade engine
     
  6. mtt.tr

    mtt.tr Member

    Messages:
    964
    Essex England
    Just not bag would rather a locost
     
  7. johnik

    johnik Member

    Messages:
    416
    Location:
    sunny Somerset

    know what you are saying, when i built my first, it was at my place of work (garage), took me about 2 years and even with the help of a local scrappy cost a whole heap of money, it,was good learning curve and well worth the "lesson", i see you are in Bristol, i am in Weston if you fancy a chat over a cuppa some time ?
     
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  8. Migmac

    Migmac Member

    Messages:
    3,219
    Location:
    Kintyre. Scotland
    Go for it, sounds a very interesting project. Once built bring up here and you can let rip on what was the longest runway in Europe
     
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  9. armalites Member

    Messages:
    4,056
    Herefordshire
    I've had the pleasure of swapping an MX5 diff for someone. They have long bolts that go though the side of the diff housing and secure it to the backbone of the car. They have some captive nuts on the top and you have to loosen the bolt a few turns then tap the bolt up to free the nuts as they are pressed into the backbone. They also stop the diff sliding out if you don't remove them. That all sounds nice and easy but the bolts were all rusted and seized to the diff and no amount of impact gun or gas would move them. I cut them in the end.If the come loose then they are dead easy to swap.

    Some of the cars have limited slip diffs but they are highly sort after so if you want one make sure you get a car with one in. Used LSD in good order can make a few hundred for complete units but the open ones can be had for £40-50

    The one I swapped was an LSD but an open one went back in, the noisy scrap LSD one still made £60
     
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  10. Cobbler

    Cobbler Codger bodger

    Messages:
    4,373
    Location:
    Gloucestershire UK
    The MX5’s tend to have open diffs, LSD’s were an option, the imported Japanese Eunos tend to have the LSD’s as standard. There are at least 2 types of LSD’s used as well, one is a friction one with clutches in which is not so good. I stripped one of these & the bits of the clutch were in the bottom of the case & swapped it for the other type.
     
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  11. MattH

    MattH Member

    Messages:
    3,579
    Location:
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    Viscous and torsion.

    @Cobbler going to give your lad a call tomorrow after enquiring about a trailer. Thanks for the heads up.
     
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  12. Cobbler

    Cobbler Codger bodger

    Messages:
    4,373
    Location:
    Gloucestershire UK
    Ok Matt, I’ll pass that on to him. Glad to help.
     
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  13. Lazurus

    Lazurus Member

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    593
    Location:
    Norfolk uk
  14. Melvyn Best Member

    Messages:
    151
    Location:
    Cambridge
    When you do build it, weld on a few earthing points on the chassis . It’s a pity some of the chassis suppliers don’t
     
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  15. armalites Member

    Messages:
    4,056
    Herefordshire
    I thought there was a certain spec on the later cars that meant it would have an LSD. I thought the MK2.5 1.8 Sport 6 speed came with an LSD as standard.

    The one my mate had was a 2001/2 I think, it was rotten as pear, he bought it cheap because planned to build a kit car. Like driving it so much he ran it round for a year did a couple of hill climbs and then scrapped it. I wish he'd told me because he was going to do because everything was really good, we'd rebulit all the brakes, put coilovers on.
     
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  16. armalites Member

    Messages:
    4,056
    Herefordshire
    Shame you don't live in Derbyshire as I'll be heading that way with an empty trailer at the weekend.
     
  17. MattH

    MattH Member

    Messages:
    3,579
    Location:
    Bristol
    Doh, Malmsbury to Keynsham is not really on the way!
     
  18. Woody.v8

    Woody.v8 Blue gluer

    Messages:
    2,977
    Location:
    staffs
    So what year is a mk 2.5 , ? Just asking for a friend :whistle:
     
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  19. Wightsparks

    Wightsparks Forum Supporter

    Messages:
    1,123
    Location:
    Wight
    Mine was 2002 "Arizona" version - came with leather seats and an LSD that did indeed make good money. Also it was silver, so again popular. It was immaculate despite a fair chunk of mileage. I sold the seats, hard top and front bumper+lights within a few days - they alone paid for the car. Someone even paid £15 for the user manual!
    2015-11-16 12.04.39.jpg

    Not much left !

    2016-04-30 17.04.37.jpg

    One on ebay at the moment - £900 with a hard top and leather...
     
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  20. Turbo Member

    Messages:
    3,195
    Location:
    Fermanagh, Northern Ireland
    Over the years I have built & raced 2 stock cars (205 & 309 gti) plus a 205 gti track car with an MI16 shoehorned into it which I have also used for a few rally time trials.
    I have to admit a lot of the fun was building the cars & in the case of the stock cars that was an endless task! Nearly every week you were repairing something or modifying something to improve performance. On the track car I rebuilt the MI16 engine - a lot of fun & the back axle - a pig of a job!

    For the money I spent on the track car I could have bought a log booked rally car but I wouldn't have had the fun building it plus I know everything on it has been done properly. Since I built it I bought a 205 gti rally car & with the number of botched jobs on it I am amazed it got through scrutineering! :vsad:

    Due to my current circumstances I have been unable to use my track car for a long time but it still gives me a buzz when I see it & realise 'I built that'! :D

    So I say if you have the cash, space, tools & facilities go for it!:thumbup:
     
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