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Thread: The MARLIN of Dorian Gray......

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  1. #1 The MARLIN of Dorian Gray...... 
    frequent forum contributor Waterscumbie's Avatar
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    It is I, davidmccomie@btinternet.com

    Have a prodigal Marina 1.8cc based Marlin Roadster MKII (brought as a kit from Paul Moorhouse, way back in March 1983).

    Lost track of it in March 2007 and police recovered it in Feb 2014. Rolling chassis and most body panels sound, but everything else ruined or missing

    So going for a complete re-build. Photo is as the police recovered it.

    Biggest concern is finding a bonnet (will also post in 'Wanted'). All ideas welcome

    avid.

    2015-02-23 11.36.48.jpg
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  2. #2 Re: The MARLIN of Dorian Gray...... 
    frequent forum contributor Club Member b_caswell's Avatar
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    I can put you in touch with a member who did have a right hand half of a second-hand hinged bonnet. Trouble is they get tweaked to suit each car
    You could have ago at making your own.
    Ben Caswell probably not the last word on anything here!!
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  3. #3 Re: The MARLIN of Dorian Gray...... 
    frequent forum contributor Waterscumbie's Avatar
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    Quote Originally Posted by b.caswell View Post
    I can put you in touch with a member who did have a right hand half of a second-hand hinged bonnet. Trouble is they get tweaked to suit each car
    You could have ago at making your own.
    Thanks Ben, please do so. Might use it as a pattern to make other side and either have a hinged one, or get an entire single piece version made. Early days.

    avid
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  4. #4 Re: The MARLIN of Dorian Gray...... 
    frequent forum contributor Club Member b_caswell's Avatar
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    Hi David, Have sent you a PM with the contact for the half a bonnet.
    Ben Caswell probably not the last word on anything here!!
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  5. #5 Re: The MARLIN of Dorian Gray...... 
    frequent forum contributor Waterscumbie's Avatar
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    Hi fellow Marlinetts ,

    And thanks to all who have sourced items for me, or offered advice, so far. [Need ideas for a front grill, the standard "kit" never made it back.]

    Anyway it's been a while, life, job hunting (still on going), property matters, restoring to minty fresh a second MX5 (1998 NB 1.6 with bolted on hardtop) and motorbike fettling have all pushed my re-imagining of my Marlin lower down my Bucket List, but I have had made some progress.

    > Rear diff and all brakes and suspension refurbished and repainted. Have a kit to make up new clutch and brake lines, once the drive tunell is modified and refitted.

    New engine IN.jpeg

    > MX5 1.6 DOHC engine refurbished and positioned in chassis to confirm driveshaft length and intended engine location to clear bonnet and to see how much room I have to play with (not a lot).

    Driveshaft positition.jpeg

    > Gaffa tape just to hold the shafts together till I measure up and tack weld for the shaft to be properly welded and balanced. Also need to come up with a gearbox support bracket which will be mounted in the new drive tunnel as per the original for the Marina 1.8 gearbox.

    Next priority is to make up a new steering shaft. Needs to have a dog leg with some Land Rover universal joints and a pillow-block support bearing to route the steering shaft round the MX5 engine to connect to the steering rack existing position. Saw the earlier warnings about changing the steering geometry, so decided to leave well enough alone

    As always, all comments or advice much appreciated.

    avid.
    Up from the ashes grow The Roses Of Success!.....
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  6. #6 Re: The MARLIN of Dorian Gray...... 
    frequent forum contributor Club Member
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    Looking good, it doesn't seem to have suffered much cosmetically. Funny how the mundane things in life keep getting in the way of real life! Why not make a dummy bonnet out of thin caravan ally (easy to work) then use it as a pattern? Good luck!
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  7. #7 Re: The MARLIN of Dorian Gray...... 
    frequent forum contributor Club Member jon_cox's Avatar
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    Hi David,
    I am sure it is just the angle of the picture or perhaps the engine is not in its final position, but it looks like you have quite an angle acting on the prop uj's.
    Have you had to offset the engine to the drivers side to fit the intake plenum in without bodywork modification? If so have you kept the drive train centre line parallel to the the car centre line?
    If not then how are you dealing with the propshaft UJ angles? I have been looking into the fitment of the MX5 MK2.5 vvt 1.8 engine (Slightly longer than 1.6) but the offset required for the intake plenum, whilst keeping the drive centre line parallel to vehicle centreline is a real head scratcher.
    I have been looking into the possibility of using CV joints instead of UJ's. This was done in the past on later dolomite sprints and TR7, TR8, Triumph Stags when they realised that the vibrations were being caused by poor drivetrain to diff alignment as the engineers had not factored in the effect of unequal UJ angles.

    Watch this video to understand what I mean.
    https://www.youtube.com/watch?v=Idk3BVDVHq4

    TR7 5 speed prop with CV joints at each end
    propshaft.jpg
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  8. #8 Re: The MARLIN of Dorian Gray...... 
    frequent forum contributor Waterscumbie's Avatar
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    Quote Originally Posted by jon_cox View Post
    Hi David,
    I am sure it is just the angle of the picture or perhaps the engine is not in its final position, but it looks like you have quite an angle acting on the prop uj's.
    Have you had to offset the engine to the drivers side to fit the intake plenum in without bodywork modification? If so have you kept the drive train centre line parallel to the the car centre line?
    If not then how are you dealing with the propshaft UJ angles? I have been looking into the fitment of the MX5 MK2.5 vvt 1.8 engine (Slightly longer than 1.6) but the offset required for the intake plenum, whilst keeping the drive centre line parallel to vehicle centreline is a real head scratcher.
    I have been looking into the possibility of using CV joints instead of UJ's. This was done in the past on later dolomite sprints and TR7, TR8, Triumph Stags when they realised that the vibrations were being caused by poor drivetrain to diff alignment as the engineers had not factored in the effect of unequal UJ angles.

    Watch this video to understand what I mean.
    https://www.youtube.com/watch?v=Idk3BVDVHq4

    TR7 5 speed prop with CV joints at each end
    propshaft.jpg
    Thanks Jon,

    I had seen the UT clip before. Was just positioning it for the length the prop shaft, think it is about right for where I want the gearshift to be, and with enough clearance between the back of the engine/bell housing and the bulkhead. I am also considering anglinging the engine slightly to the left, along its horizontal axis to give better clearance for the intake plenum and allow better clearance for the steering column. WIll position the right side engine bay housing before I do any final permanent fixing of the engine to engine brackets and welding in new engine mounts.
    ]
    I intend for the driveshaft to be perfectly horizontal when the dif/chassis/suspension is "at rest" on my garage floor. And looking from above the shaft will be at a a right angle to the rear axle.
    ]
    Fun part is the final position/angle of the gearbox/engine and making up the engine supports. Still have to find the right engine mounts and place to fix them to the chassis.
    ]
    Also in two minds about re-using the original Marina pedal box and pedals, or see if the MX5 pedal box and brake servo (much slimmer that the Marina one) could be used instead.

    How far have you progressed with your build?

    Regards,

    avid
    Up from the ashes grow The Roses Of Success!.....
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  9. #9 Re: The MARLIN of Dorian Gray...... 
    frequent forum contributor Club Member jon_cox's Avatar
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    Hi David
    No physical progress so far. Have been at the planning stage for a few years........
    Too many distractions in life at the moment. I did not even put the car on the road this year due to other projects.
    Hopefully get things going after the summer.
    What are your plans for fuelling? Will you change the fuel tank for a custom made job with sump, baffles and fuel line return? Or go the swirl pot route?
    If you change the pedal box to mx5 will you need to change the steering column position or perhaps use the mx5 column?
    Trouble is every decision has a knock on effect which sends you round in circles.

    Jon
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  1. MX5 Marlin of Dorian Grey {any technical advice or wisdom, much appreciated}
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