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Thread: New (old) Member. History of Marlin Roadster Q285 AVO.

  1. #1 New (old) Member. History of Marlin Roadster Q285 AVO. 
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    Hi I am a new/old member (Adrian Priest days) and I joined this Club in March. I built my Mk11 Roadster Chassis No. MRC 2546 (the MRC are my initials and I stamped them on the plate before having it registered so there recorded on the V5) between 1984 and 1986 getting it on the road in May 86. I did a completed dry build of the car to running condition then stripped it down again to paint all the individual panels on both sides. In brief I then used the car for several years covering about 10000 miles. Then from about 1992 it fell into disuse to work commitments and other interests. Them in 97 I refurbished the engine treating it to a re-bore new pistons, reconditioned the head etc. but returning it to the road revealed severe over heating problems obviously due to the tight engine and it became totally unusable with a very real fear of being scolded if any of the cooling components failed, the heater literally roasted your legs, so it was back off the road while I had a think. I returned it to the road again in 2004 for a short while but despite no end of trials trying to get it to run cool all attempts failed, it was running that hot I had to stall it to get it to get the engine to stop. Again life my busy got in the way working and doing several other sometimes domestic projects, renovate a 3 bedroom rental property (for my retirement pension) fitting 4 kitchens, 2 Bathrooms for family and block paving my rear garden then some proper interesting work on several motorcycle projects.
    Fast forward to March 2020 and covid-19 lockdown - Marlin time - only this time no mucking about I'm going straight for a new high efficiency radiator and several other mods and a complete refurbishment of the car including a full repaint and retrim of the interior. So at this moment I have removed all the body panels and chiselled out the old windscreen, boy did that Sikaflex stick. Rebuilt and painted the front and rear suspension, new bearings and seal in the rear axle. I have welded up frame to support the brake servo carrier due to a cracked bulkhead and I've modified the clutch slave cylinder so that it can be removed when the bulkhead is in place. I'm looking into moving the steering rack rearwards to get a decent radiator in, I've cut the rack mounts off above the angle iron cross brace and welded them to sole plates to fix them by either welding or drilling and bolting once I have the radiator in position. That's the position at the moment and when I can work out how to post pictures I will put some on of my progress.
    Stay safe and take care All. Mick Clamp.
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  2. #2 Re: New (old) Member. History of Marlin Roadster Q285 AVO. 
    club member Club Member listerjp2's Avatar
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    That's a great story keep up the work and keep us informed.

    Adrian
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  3. #3 Re: New (old) Member. History of Marlin Roadster Q285 AVO. 
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    Welcome back
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  4. #4 Re: New (old) Member. History of Marlin Roadster Q285 AVO. 
    club member Club Member dcunn's Avatar
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    Welcome back from me too Mick

    Here's your car from "back in the day"

    Look forward to the rebuild pics, if I can help with them please get in touch

    Dave Cunnington
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  5. #5 Re: New (old) Member. History of Marlin Roadster Q285 AVO. 
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    Welcome back to the club. You sound like an experienced builder so I don't want to teach an old dog new tricks, but I am concerned about you moving the steering rack mounts. While I have no hands on experience of the Roadster, the position of the steering rack will be precisely calculated and changing it will have an effect on the steering geometry, and could be dangerous without careful consideration.
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  6. #6 Re: New (old) Member. History of Marlin Roadster Q285 AVO. 
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    Hi Scott, thank you for your comments and yes your absolutly right about any affects on steering geometry. I've read all sorts of documents, watched stuff on youtube etc and most evidence seems very ambiguous to say the least. The Akerman principle from my understanding looks to be measured and governed by a line taken through the king pin swivel points along the line of a triangle taken from the centre line of the rear axle and through the steering arm track rod end, but yes I could have misunderstood/interpreted it wrong! However nothing proves a point better than actual physical trials and experiments. so what I did to convince myself that it should repeat should alright was to set up some string lines, paper charts. and a protractor to measure the wheel angles on both wheels from lock to lock with the rack in various forward/aft positions and apart from the toe in/toe out corrections the wheel angles remained the same throughout the trials or were literally immeasurable from the techniques that I was using. But from what has been previously stated and "I don't want to open a can of worms on the Akerman principle" I could be completely wrong and I've not considered the effects of bump steer or self centring yet, but on the Marlin set up I can't see that the position of the rack rearwards (40mm Max) makes any difference. Depending on the final fit of the new radiator when I get it I might end up putting the rack back in its original place again yet and I will only move it if its safe. As I am a practical mechanical engineer (retired) I would really appreciate any input/advice from any technical engineers or fellow members. I do not drive it like a race car or performance car to me its my affordable sedate 1950 MG TF.
    I originally brought my Marlin because I liked the looks and quality of the kit, performance didn't matter to me, I remember being taken around Mallory Park on a track day by Paul Morehouse and I remember a comment from him saying whilst flying round one corner "I wish these bloody Cobra's wouldn't keep getting in the way , his Marlin was like it was on rails, and it S--t me up - honestly! Bye for now. Mick.
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  7. #7 Re: New (old) Member. History of Marlin Roadster Q285 AVO. 
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    Thank you thats amazing were did that picture come from?
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  8. #8 Re: New (old) Member. History of Marlin Roadster Q285 AVO. 
    club member Club Member dcunn's Avatar
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    It's in the archive which I run for the Club, probably you sent it to Marlin and we have all their old customer files

    ……..email me personally (details in Pitstop magazine) and I can send you all
    the archive pics I have of the car - there are six from 1989 to 1998, and a
    higher resolution copy of this one

    Rgds Dave Cunnington
    Last edited by dcunn; 02-05-2020 at 03:34 PM.
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  9. #9 Re: New (old) Member. History of Marlin Roadster Q285 AVO. 
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    It was a ride in Mick's Roadster that got me into Marlin ownership back in '91 and someone who has been a good friend since. Oh. and he forgot to mention the NCF Diamond he also built amongst his various projects!
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  10. #10 Re: New (old) Member. History of Marlin Roadster Q285 AVO. 
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    Thank you Alan I completely forgot that one. It was you visiting me with your then current Roadster in February that inspired me to finally get my finger out and get mine back on the road this year though I didn't plan to be doing a full refurbishment on but it will be well worth it. I can't believe how my standards and abilities have changed over the last 35 years either because as I stripping it down I soon found areas that I definitely would not put up with today, like the rats nest of wiring under the dash "that would do for now" never got sorted and tidied up, if it was somebody else's car I would be thinking what bodge merchant put this together, but the Marlin design puts up with it though, I think that at the time I was a young thirtyish youth anxious to get the car on the road after all the hours and frustrations spent building it.
    Last edited by marlinmick; 03-05-2020 at 12:56 PM.
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