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Go Back   Madabout Kitcars Forum > Mad Build Area > Vintage and Classic Roadster Kit Car Builds

Vintage and Classic Roadster Kit Car Builds For Vintage and Classic era kit cars. Post your build reports, problems and progress here

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  #101  
Old 18th February 2022, 11:51
Dpaz Dpaz is offline
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Looking good, just one question. Where did you fit the kitchen? There is no room in my Marlin!
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  #102  
Old 18th February 2022, 13:31
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Looks very neat and tidy
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  #103  
Old 9th March 2022, 18:28
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Default Door and windscreen frame

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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  #104  
Old 16th March 2022, 17:20
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MartinClan MartinClan is offline
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Default Engine

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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  #105  
Old 16th March 2022, 18:05
Mitchelkitman Mitchelkitman is offline
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That reminds me of the first time I used Ebay...... We were moving 19 years ago, and I'd bought a TC engine from the scrappy a few years previously and gleaned the head and front pulley from it (all it needed was a slightly larger fan belt) to use on my MGB engine. Anyway, back to the story. In my Ebay nativity I started it off at 99p as I wanted it shifting as I didn't want to take it with us. Guy 'won' it for
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  #106  
Old 16th March 2022, 18:06
Mitchelkitman Mitchelkitman is offline
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That reminds me of the first time I used Ebay...... We were moving 19 years ago, and I'd bought a TC engine from the scrappy a few years previously and gleaned the head and front pulley from it (all it needed was a slightly larger fan belt) to use on my MGB engine. Anyway, back to the story. In my Ebay nativity I started it off at 99p as I wanted it shifting as I didn't want to take it with us. Guy 'won' it for 1.20. he turned up in a battered old car with all the family (Wife and 2 young kids) having driven from the Midlands to south Essex. he got out of the car saying "that was handy, I work at an engine reconditioners and have been looking for one for nearly a year - that will do nicely, can you give us a hand with getting it in the boot? Here's your 1.20, I raided the kids piggy bank"
I'd have at least given 10, having just made that statement, it probably had 5 scrap value! Anyway, off he went on the journey back, and I wondered if the floor of the old car would support the block all the way
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  #107  
Old 15th April 2022, 08:34
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MartinClan MartinClan is offline
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Default Head Completed

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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  #108  
Old 16th April 2022, 16:56
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Nice, like the colour. Sonuds like it'll be pretty peppy.
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  #109  
Old 19th April 2022, 19:21
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peterux peterux is offline
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Yes, that does look nice and it has cleaned up well.
Looks like that engine you bought was a really good find.
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  #110  
Old 9th May 2022, 07:49
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MartinClan MartinClan is offline
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I have been looking for ideas that would help to bring the exhaust out of the side of the car as Marlin intended. Marlin supplied a special exhaust downpipe which allowed this but it was a very tortured design and probably not good for gas flow. And of course it's long since you could obtain it. I even tracked down the manufacturer (Double S) and they confirmed that had binned the pattern. But after a lot of Googling and general phaffing about I have purchased this exhaust manifold - currently on its way from the USA.

patriot h4800 exhaust by Robin Martin, on Flickr

It's a 3 into 1 design, ending in a 2" pipe, that hugs the block. I reckon with a bit of luck I should be able to bring the exhaust out the side either under or over the chassis rail.
So the next question is does anyone have any experience of silencers? There are loads for sale on Ebay, most of which I guess are from China and of dubious quality. I am looking for something that is not outrageuosly loud, but not too quiet either.....

Cheers, Robin,
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  #111  
Old 9th May 2022, 12:30
AlanHogg AlanHogg is offline
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Default exhaust

Didn't SS also make the original silencer?
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  #112  
Old 10th May 2022, 10:00
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Yes I think SS made the complete system. But, although they remember making it, they no longer have any of the patterns. Or so they told me.

Cheers, Robin
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  #113  
Old 25th June 2022, 18:46
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MartinClan MartinClan is offline
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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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