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Thread: Tyres for a Marlin Roadster

  1. #11 Re: Tyres for a Marlin Roadster 
    regular forum contributor
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    Nitrogen filled tyres? Surely that's just a marketing ploy.
    Most industrial air compressor systems are fitted with air dryers, so water in the air is a spurious argument. Yes nitrogen molecules are bigger than Oxygen but air has 70% nitrogen anyway, and you should check your tyres regularly anyway, not just for pressure, properly inflated tyres will reduce wear, whatever is in them.
    But, the big question is, how do you get all the air and moisture out of a newly fitted tyre? Surely it has nowhere to go as there is only one fill valve and no empty valve?
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  2. #12 Re: Tyres for a Marlin Roadster 
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    Yes it is a pointless moneymaking ploy. From my working days, a 1degC temperature change at 3bar would give a pressure change of 15mb.Probably 7.5mb at 1.5bar. It would only remove moisture if the tyre was flushed several times. Pressurised and vented, Nitrogen is very dry so it will absorb moisture, but if you don't let it out it stays there. IMHO I doubt if many road drivers could tell the difference. But if you like it use it.
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  3. #13 Re: Tyres for a Marlin Roadster 
    club member Club Member andyf's Avatar
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    Quote Originally Posted by HairyDave View Post
    Yes it is a pointless moneymaking ploy. From my working days, a 1degC temperature change at 3bar would give a pressure change of 15mb.Probably 7.5mb at 1.5bar. It would only remove moisture if the tyre was flushed several times. Pressurised and vented, Nitrogen is very dry so it will absorb moisture, but if you don't let it out it stays there. IMHO I doubt if many road drivers could tell the difference. But if you like it use it.
    I had some filled with nitrogen on my company car a while ago and it made no difference. I think Tiff came to the same conclusion.
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  4. #14 Re: Tyres for a Marlin Roadster 
    club member Club Member stevejgreen's Avatar
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    Sometimes technology used in race cars has a practical implication for road cars. ABS for example.

    Other times, it's difficult if not impossible to see how the technology filters down, in this case to road tyres.
    We change tyres at the drop of a hat. More concerned with economy, wet weather grip and noise, then what's actuall inside them, if it still meets manufacturers spec.
    MOC member since 05/97
    1984 Marlin Roadster SWB.
    1800TC, Unleaded ported head, stage 2 cam. Ford Type 9 gearbox, Dolomite Sprint rear axle fitted with MGF disc brakes.
    Three core radiator, Renault Clio vented front discs.
    The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.

    Loads of Marlin Reference can be found documents here or there.
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  5. #15 Re: Tyres for a Marlin Roadster 
    Thank you Gareth
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  6. #16 Re: Tyres for a Marlin Roadster 
    Thanks for the advice.
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  7. #17 Re: Tyres for a Marlin Roadster 
    Thanks everyone for your suggestions and recommendations on tyres. I feel well out of my depth at some of the questions re my Roadster as I'm new to this game ..... and NOT a mechanic!

    The details I have on my car are as follows ...
    Reg Q281BAU
    First registered 1/10/91
    Revenue weight 715 Kg Gross
    1600 CC Petrol engine from a Mazda
    Chassis No SABTV0343124034

    Fiona
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  8. #18 Re: Tyres for a Marlin Roadster 
    club member Club Member dcunn's Avatar
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    Hi Fiona, and thanks for that info.

    Next time you are grovelling around the car, please could you have a look for the Marlin kit number, located on a very small plate on the nearside front of the chassis, as per this picture (for a Marina based car.)

    Yours is one of many cars for which we cannot (yet) tie in the original factory data.

    If you would rather not put the info in public on this forum, my email address is in Pitstop

    Many thanks DC

    + + + + + + +

    PS For other members who are reading this, I would appreciate you to do the same and let me know your Marlin Kit/chassis number and vehicle reg.
    For Triumph based cars contact Ben or I, we can show you the other places to look !
    As with Fiona's car, your V5 could well reflect data from the donor car and not necessarily the kit number.
    Tell me your kit number and it's possible we may be able to give you some past history of your car.
    Rgds DC
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  9. #19 Re: Tyres for a Marlin Roadster 
    club member Club Member jon_cox's Avatar
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    Hi Fiona,

    You have put something into your thread that will interest almost everyone of us on here. You say your car has a 1600cc engine from a Mazda. This is the holy grail of engine upgrades for the Roadster due to it being a modern fuel injected engine designed for RWD and very cheap to buy. Please post some photos of the installation for us all to see.

    If you struggle with the photo bit then you can send them to me and I will post them for you. email is jonathan.cox@grantadesign.com
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  10. #20 Re: Tyres for a Marlin Roadster 
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    yes please +1
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