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Thread: DRL152K Marina based roadster rebuild

  1. #21 Re: DRL152K Marina based roadster rebuild 
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    Great Thread this , where I should be on my rebuild ! Oh time is such a precious thing !
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  2. #22 Re: DRL152K Marina based roadster rebuild 
    club member etypephil's Avatar
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    Excellent attention to detail, and motivating me to strip and rebuild mine, when I have finished the bathrooms, and built a bigger garage. Probably over the 2023 / 2024 Winter; one has to have a plan.

    ETA: Those wheels will look great.
    Last edited by etypephil; 22-02-2022 at 05:04 AM.
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  3. #23 Re: DRL152K Marina based roadster rebuild 
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    I have been making slow progress albeit going a bit from one thing to another.
    The windscreen frame has to be one of the Roadster's main features doubling up as a roll bar. However I was never very happy with it in the "raw" state. It is bent from a solid steel bar with a slot milled on the inside to take the screen. This left very sharp edges and some hollows in it from the bending process. So I have taken the angle grinder and P38 to it. Looks much more acceptable now.
    windscreen_frame2 by Robin Martin, on Flickr
    windscreen_frame1 by Robin Martin, on Flickr

    I have also completed a prototype door. The plan is to use a solid plywood core as in the original Marlin supplied door. However decent plywood is sooooo expensive now I made the proof of concept door from MDF. I have now skinned it in alluminium (left over from the Pembleton build). I am pretty pleased with the result and now happy to take the saw and router to the final plywood version. The latch is from a landrover, modified by removing the outside handle and lock barrel. I was going to use a Morgan latch but they are now over GBP70 each whereas the landrover one is GBP30.
    door_prototype1 by Robin Martin, on Flickr
    door_prototype2 by Robin Martin, on Flickr

    Cheers, Robin
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  4. #24 Re: DRL152K Marina based roadster rebuild 
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    Never buy an engine from ebay and someone you don't know were the words echoing in my head as I handed over my hard earned.....
    Anyway the story is BMC 1800 engine (Marina, MGB etc.) for sale on Ebay. It had an almost unbelievable spec with a Vulcan gas flowed head, Piper camshaft etc etc and had never been run since its rebuild. Of course I smelt a rat particularly as it had had a quick blow over with black paint. Anyway - I persued it and the story had a certain ring of truth. Advertised by an older, and and possibly a bit naive, guy. He had purchased it for his MGB but then found it was originally from a Marina TC and wouldn't fit. The crankshaft spigot bearing is much smaller for a Marina. So he decided to sell it on Ebay and, not suprisingly as it wouldn't easily fit an MGB, hadn't had a lot of interest. So a bit of negotiation ending up in a price that was far less than what just the head was worth and the engine was mine. He even delivered it.
    Today I couldn't resist any longer and started the checking process. The plan is to dismantle and re-assemble it anyway not trusing work that someone else has done. An engine built to this spec should have certain features, double valve springs, duplex timing chain etc. And I am pleased to say it all looks good so far!
    The head has clearly had a lot of work - you can see the porting through intlet and exhaust ports.
    engine4 by Robin Martin, on Flickr
    engine3 by Robin Martin, on Flickr
    And it has the requisite double valve springs and duplex timing chain.
    engine2 by Robin Martin, on Flickr
    engine1 by Robin Martin, on Flickr

    The next step is to get it on to the engine stand and pull it apart a bit more. But so far looking good.....

    Cheers, Robin
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  5. #25 Re: DRL152K Marina based roadster rebuild 
    club member Club Member jon_wilkinson's Avatar
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    Such a good feeling when you take a bit of a risk and it pays off. Hope the bottom end turns out as good as the top.
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  6. #26 Re: DRL152K Marina based roadster rebuild 
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    I have now completed the dissassembly and reassembly of the head. It's now resplendant in MGB maroon which I understand would have been the original colour. Everything looked pretty good. The head has been gasflowed to what I suppose is stage 2. I am no expert but it looks pretty much as Peter Burgess describes in his MGB tuning book with the exception of hardened exhaust seats which it doesn't seem to have. Which leads me to think all the work on it was done many moons ago.
    stripped_head by Robin Martin, on Flickr
    reassembled_head by Robin Martin, on Flickr
    During the strip and reassembly process I also cleared out all the waterways by blanking off the thermostat position and filling it with a solution of Rust Destructor and letting it soak for several days. It seems to have done the trick.
    derusted by Robin Martin, on Flickr
    While I was at it I also measured the combustion chamber volumes so I could work out the compression ratio.
    combustion_chamber_vol by Robin Martin, on Flickr
    Using the formula in Peter Burgess's book:

    Engine size with +30 overbore = 1834cc. Cylinder swept area = 458.5cc
    Combustion chamber volume as measured = 41cc
    Clearance volume = 6.5 + 2 + 4.5 + 41 = 54cc
    Compression ratio = (458.5 + 54) / 54 = 9.49

    While I was at it I though it would be fun to work out the potential 0 to 60 time. Again using a formula from Peter Burgess.

    0 to 60 = (2 x W / T) to the power of 0.6
    W = weight – say 750 kgs = 1650 lb
    T = torque – say 120 lb/ft (figure from Peter Burgess book for an engine with similar configuration)
    0 – 60 = 7.3 seconds
    So - no slouch then....

    Cheers, Robin
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  7. #27 Re: DRL152K Marina based roadster rebuild 
    club member Club Member andyf's Avatar
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    Loving the build thread. Which servo and master cylinder combination are you using?
    Mk2 SWB Marina Roadster with a 2.0L Pinto built in 1986
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  8. #28 Re: DRL152K Marina based roadster rebuild 
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    Quote Originally Posted by andyf View Post
    Loving the build thread. Which servo and master cylinder combination are you using?
    Servo is TR6 as they are still available new. As I recall the (dual) brake master cylinder is also TR6
    Again available new.
    Cheers Robin
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  9. #29 Re: DRL152K Marina based roadster rebuild 
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    I have pretty much finished the engine build now other than the water pump and sump.
    The sump I have to swap from the original engine as the one that came with the replacement had been buchered somewhat. A bit of a pain as it means I will need both engines in the air at the same time in order to do the swap.
    The water pump hmmm... the one I purchased from a well known MGB parts specialist was rubbish - the casting looking like a copy of a copy of a copy... But I think I have located something better now.
    You can see from the pictures that I forked out on a vernier timing wheel. Reground camshafts (so I am told) frequently need the timing tweaking to get it 100% correct. Certainly true in my case as when I had selected the specified advance it was nowhere near where it would have been if I used the two dots on the original chain wheels.
    And finally I couldn't resist trial fitting the exhaust manifold I purchased from the states. The hope is that this will help me get a side exit for the exhaust without too many tortuous turns or any cutting and shutting of the exhaust system.
    timing1 by Robin Martin, on Flickr
    engine6 by Robin Martin, on Flickr
    engine7 by Robin Martin, on Flickr
    engine5 by Robin Martin, on Flickr

    And finally - purchased these from Ebay. Already a bit of a bargain, the guy that makes them reduced the width so they would fit the Roadster - FOR FREE!
    seats by Robin Martin, on Flickr
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  10. #30 Re: DRL152K Marina based roadster rebuild 
    club member Club Member David's Avatar
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    I’ve been looking at those seats for my Sportster, a local trimmer reckons he can make some nice tie on cushions for them. Are they OK?
    - 9th owner of T693 SSC possibly a factory built Ford based V8 Sportster
    - 4th owner of Q309 RNV, an early Cabrio built by Bob Copping, owned Doug & Liz Billings for 16 years
    - 9th Custodian of JRR 929D, Triumph Vitesse based special Paul Moorehouse built prior to the Triumph Roadster kits.
    - 8th owner of Roadster chassis number 2395. Now owned by Barry!
    - Builder of chassis number 2325 (PKK 989M) in the mid 80's. Now owned by Eric & Lynne.
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