Zel's Fleet Blog - BX, Jag XJ-S, Sinclair C5, Mercedes 208D & 230TE, AC Model 70.

Tell us your ongoing tales and experiences with your French car here. Post pictures of your car here as well.
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Zelandeth
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Re: Zel's Fleet Blog - BX, Jag XJ-S, Sinclair C5, Mercedes 208D & 230TE, AC Model 70.

Unread post by Zelandeth »

I *thought* the ride seemed even bouncier and the handling more twitchy than I remembered.

Yeah. I totally forgot that when I realised the car would be laid up for a considerable period that I'd pumped the tyres up to 40psi to help resist flat spotting, didn't I?

Back down to low 20s and it's behaving much more as I expected! I do manage to miss such bloody obvious stuff sometimes that I do sorry about myself.

First time I've ever been able to do this!
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I need to do some experimenting to see if it's possible to park diagonally. That would allow me to actually get any car out without needing to move others which would be a *really* nice quality of life improvement. Though I'm pretty certain I did the math when we were looking at this a couple of years ago and I think we're about a foot and a half short on available width for that to be feasible. Widening the driveway (or totally changing the layout if we were going down that route) would require planning permission, which we would almost definitely be refused, so that's a non starter, despite adding a couple of feet of extra width being really easy to do from a technical perspective - probably would have added less than a grand to the total bill. Not risking angering the planners twice in one year though. Last time cost me ended up with me essentially flushing five grand down the toilet.

Have started to put together the next new page for the website. This will be our subject.
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Which at a glance doesn't look too unusual...just a bit of a chunky older scientific calculator. Right up to the point where I tell you that thing dates from 1972. No, that's not a typo.

Conventional algebraic entry, 10 memory registers, 2 80-step program memories, and all the functions you'd expect of a normal scientific calculator from 40 years later (in fact, the one-key DMS conversion isn't a given even today). This thing wiped the floor with most mains only desktop units in its day, never mind something that was genuinely portable and had a 3 hour battery life. Aside from the lack of a floating decimal point (the machine always works to 13-places internally, and you can change to displaying 0-9 places at any time, and the 2nd function key needing to be pressed after an operator key rather than before, it really does work just like any normal scientific calculator you could buy today. Which for something of this calibre from the early 70s is really, really unusual.
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Compucorp really is one of those names which just became another historical footnote to be forgotten in the massacre that was the calculator/computer market contraction of the late 70s/early 80s which deserves to be better known. They were a solid four or five years ahead of the curve in the early 70s, and that was a huge lead to have back then. It was just when highly capable and relatively inexpensive general purpose microprocessors started to become widely available that the writing was on the wall for them as they became just another computer company then, without a particular killer product. So nobody remembers them now. For all their products in the mid 70s blurred the line between calculator and computer, computers changed a lot very, very quickly from then on, and the little guys like these were just left behind.
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I was hoping not to have to go into huge detail about where they came from, but I think for the page to have any real useful context it's going to be necessary...I just don't want it to end up being too painfully tedious to read.
Current fleet:
07 Volvo V70 SE D5, 85 Sinclair C5, 84 Trabant 601S, 73 AC Model 70, 62 Rover 110.
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CitroJim
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Re: Zel's Fleet Blog - BX, Jag XJ-S, Sinclair C5, Mercedes 208D & 230TE, AC Model 70.

Unread post by CitroJim »

Wow! That's a new one on me Zel and I thought I knew my 70s calculators...

I did wonder why you did not make your new drive wider. All understood now.
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Re: Zel's Fleet Blog - BX, Jag XJ-S, Sinclair C5, Mercedes 208D & 230TE, AC Model 70.

Unread post by mickthemaverick »

Nothing to stop you laying an artificial grass strip down the edge of the lawn to give you a couple of feet to take the overhang of the noses and park diagonally is there? :-D
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Re: Zel's Fleet Blog - BX, Jag XJ-S, Sinclair C5, Mercedes 208D & 230TE, AC Model 70.

Unread post by Gibbo2286 »

Or add to the width one row of bricks at a time, the dolts at the planning office might not notice. :)
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Re: Zel's Fleet Blog - BX, Jag XJ-S, Sinclair C5, Mercedes 208D & 230TE, AC Model 70.

Unread post by myglaren »

Have you any Wang computers? They seemed to be the thing to own a few decades ago.
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Re: Zel's Fleet Blog - BX, Jag XJ-S, Sinclair C5, Mercedes 208D & 230TE, AC Model 70.

Unread post by Zelandeth »

Gibbo2286 wrote: 07 Mar 2025, 09:33 Or add to the width one row of bricks at a time, the dolts at the planning office might not notice. :)
I am not doing a single thing which can in any way, shape or form possibly ruffle their feathers. We've plainly got at least one neighbour who has chosen to make life difficult for me, so they are looking for anything they can possibly report us for. Also once they've served one enforcement notice on you, yes they do absolutely keep an eye on you for a couple of years. So I'm being very, very careful.

Fun fact, when someone has claimed that you're operating a vehicle repair business out of your property, proving that you are NOT doing something is really surprisingly labour intensive.
myglaren wrote: 07 Mar 2025, 09:55 Have you any Wang computers? They seemed to be the thing to own a few decades ago.
Nope. Not something I've ever specifically gone looking for, and those I have randomly come across for sale have always had too many digits in the price tag for my liking.
Current fleet:
07 Volvo V70 SE D5, 85 Sinclair C5, 84 Trabant 601S, 73 AC Model 70, 62 Rover 110.
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Re: Zel's Fleet Blog - BX, Jag XJ-S, Sinclair C5, Mercedes 208D & 230TE, AC Model 70.

Unread post by Gibbo2286 »

I can understand your plight Zel I have a pathological hatred for planning departments and their ways. They stymied a lot of my plans when I was in the garage and used cars sales business with all sorts of nonsense objections and conditions, even tried to insist my used cars were hidden from view by planting trees at the front of the site.
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Re: Zel's Fleet Blog - BX, Jag XJ-S, Sinclair C5, Mercedes 208D & 230TE, AC Model 70.

Unread post by CitroJim »

myglaren wrote: 07 Mar 2025, 09:55 Have you any Wang computers? They seemed to be the thing to own a few decades ago.
Ahh :D Wang computers - always good for a schoolboy giggle :lol: And having used and worked on their 1980s 386 desktop PC extensively they were anything but what a small corruption of their name might suggest - they were excellent, built like tanks, practically indestructible and gave a good account of themselves performance-wise.

We used them in large numbers in a very critical role and bought a lifetime stock of spares to maintain them well past their End Of Life date. Definitely a good one to have in any historical collection if you have room for one and can lift one.

I can see why they still command a good price.
Jim

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Zelandeth
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Re: Zel's Fleet Blog - BX, Jag XJ-S, Sinclair C5, Mercedes 208D & 230TE, AC Model 70.

Unread post by Zelandeth »

Something which made itself known at the end of last week on the Trabant was an absolutely horrendous rattle from somewhere up front. This was plainly a "something external touching something it shouldn't" rather than anything that was actually a sign of impending failure. So annoying rather than worrying.

Sure enough a bit of poking round found the culprit.

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The metal adjuster collar on the throttle cable had come into contact with the heater box. Being a pretty lightly built tin box with nothing but a flap in this did a great job of amplifying this into an extremely annoying din.

This has now been rerouted to keep it well clear - though I did scratch my head a bit as to how to keep it there as there wasn't really anything obvious to tether it to. Eventually I figured out I could trap it under the sound deadening jacket and that keeps it exactly where it needs to be.

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If it does it again I'll mount an eyelet on side of the heater box to properly anchor the cable to. If time permits I may well do that anyway as it's a much more elegant solution.

She has also had a bit of a facelift.

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It's purely a matter of personal taste, but I just think these bumpers suit the car and the utilitarian, no nonsense approach to things. The fact that these have pretty much exactly the same level of patina to them as the car is just a bonus.

One of the things I'd been missing before was the air dam which sits below the front bumper which basically helps shield the carb and alternator from road spray and debris as they sit down really low as you can see below.

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These areas are rather better protected now.

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I had always thought that panel was plastic until it arrived, nope it's actually metal.

The rear one took about ten minutes to swap.

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Front one on the other hand was rather more of a fight. I'm not sure whether it dates back to when the car obviously had a bit of a knock on the nose or when the bumper was changed, but every single one of the retaining bolts had been snapped. Both ends of the bumper instead of using the original bolt holes, were attached using a couple of Z shaped brackets bolted into the sheet metal on little bridge between the bottom of the wheel arch and front panel.

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That would indeed explain why it wobbled so much.

As there is enough room to do so, I decided that just re-drilling the mounting holes a touch further back was the best approach. I've only done one so far as my drill bits are apparently incredibly blunt and it took me about half an hour of fighting to get two drilled. It's a thousand times more secure than at any time in the last year or so anyway.

I'll grab a couple of appropriately sized cobalt bits this week and get the additional fixings in place - it's a hundred times more solid now than it was. The bottom of the right hand wing definitely will want some attention with a welder at some point as it's distinctly crusty.

One surprising bit of good fortune however came when I went to fit the number plate. I'd drilled a couple of holes in that basically using Mark I Eyeball as a measuring device when the sticky pads holding it on to the bumper started to fail.

Two unexpected things happened here. First was that the machine screws I used were exactly the right type for the metal threaded inserts on the bumper - second was that I had by total chance put the holes in such a place that they *exactly* lined up with the holes in the new bumper.

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Complete and total luck...but just like when playing pool, keep a straight face and make everyone believe you meant that shot to play out that way and no, it of course wasn't a total fluke...

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Hopefully I can find a new home for these that have come off.

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Shouldn't be a problem though - just like on Minis where everyone wants chrome, there seem to be a lot of people who want to put the older style kit on their Trabants so I doubt it will be hard to find a good home for those bumpers.

Of course the universe being what it is, I'm never allowed to actually reduce the number of things on the to do list am I? While crawling around under the front of the car I noticed something else needing attention.

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Crack and a couple of pinholes in the centre exhaust section just back from the joint to the heat exchanger. Now this isn't the end of the world...but it would have really been nice to find this BEFORE having a couple of hundred Euros worth of boxes shipped over from Germany, as including a system in there (I'd probably have taken the opportunity to upgrade to the 45mm version to get the most out of the upgraded engine) wouldn't have made much odds to the shipping bill there...on its own, the shipping near enough doubles the price.

I'll need to have a closer look and see what shape the rest of the system is in before I decide what to do there. Obviously if there's any questions over the condition of the heat exchanger that will definitely be changed given the safety implications of it failing. I suspect if we end up looking at replacing more than that one bit of pipe I'd *probably* look at getting a 45mm heat exchanger (there is a version which includes a larger and much more classically designed two stroke expansion chamber but also maintains the heating function) and having the rest of the system made up in stainless locally. At this point I've spent so bloody much on shiny bits the car is obviously sticking around so I may just as well make it as good as I can and this is the sort of thing I'll probably thank myself for long term.
Current fleet:
07 Volvo V70 SE D5, 85 Sinclair C5, 84 Trabant 601S, 73 AC Model 70, 62 Rover 110.
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Re: Zel's Fleet Blog - BX, Jag XJ-S, Sinclair C5, Mercedes 208D & 230TE, AC Model 70.

Unread post by xantia_v6 »

Have you got a CO monitor mounted in the interior?
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Re: Zel's Fleet Blog - BX, Jag XJ-S, Sinclair C5, Mercedes 208D & 230TE, AC Model 70.

Unread post by CitroJim »

To save a lot of carriage and faffing around from Germany Zel, can you not have a new exhaust scratch-built locally using one of the specialists? Perhaps in stainless steel?

It's what I plan when one or more of my AX fleet need one.
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Zelandeth
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Re: Zel's Fleet Blog - BX, Jag XJ-S, Sinclair C5, Mercedes 208D & 230TE, AC Model 70.

Unread post by Zelandeth »

CitroJim wrote: 11 Mar 2025, 06:04 To save a lot of carriage and faffing around from Germany Zel, can you not have a new exhaust scratch-built locally using one of the specialists? Perhaps in stainless steel?

It's what I plan when one or more of my AX fleet need one.
Aye, I just need to inspect it first to see what's needed. If it's just that single bit of pipe I may be able to get hold of one. Stainless is probably the sensible way to go for the rest of the system though - the caveat of course being that I'd still need to get the heat exchanger shipped over as that's a specialised enough thing the likes of Deutsch Tech aren't going to have the bits on the shelf to make one. The other headache I may well run in to is whether anywhere stocks small hire enough pipe! The stock system is only a 38mm bore, which is pretty tiny compared to most things likely to turn up with customers looking for stainless systems.
xantia_v6 wrote: 11 Mar 2025, 01:33 Have you got a CO monitor mounted in the interior?
Something I really should look into again. I did have one in TPA for a while, though it eventually got hurled into the back of the garage as household ones are just too sensitive for use in cars it seems. It would regularly go off inside the car inside the garage just when I had a car idling outside with the exhaust vaguely near to the door. More than once it went off at a show when the car next to me was running and the wind happened to be wafting fumes in the wrong direction.

At least the risk factor in the Trabant is reduced somewhat in that you'd smell an exhaust leak pretty quickly, plus the exhaust system pressure is orders of magnitude lower than on a four stroke engine. It is definitely something I need to have another look at though as I may just have had a defective unit last time round.
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07 Volvo V70 SE D5, 85 Sinclair C5, 84 Trabant 601S, 73 AC Model 70, 62 Rover 110.
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Re: Zel's Fleet Blog - BX, Jag XJ-S, Sinclair C5, Mercedes 208D & 230TE, AC Model 70.

Unread post by myglaren »

I've only done one so far as my drill bits are apparently incredibly blunt and it took me about half an hour of fighting to get two drilled. It's a thousand times more secure than at any time in the last year or so anyway.

I'll grab a couple of appropriately sized cobalt bits this week and get the additional fixings in place
Minor point.
I bought some cobalt drills a decade or so ago and was not overjoyed with them.

People I worked with recommended Würth drills. Expensive but very good and last for ages.

Never got round to buying any for myself though.

Only just noticed the registration plate. Very apt.
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Re: Zel's Fleet Blog - BX, Jag XJ-S, Sinclair C5, Mercedes 208D & 230TE, AC Model 70.

Unread post by Gibbo2286 »

On ebay this morning I saw a mufller for one of the Trabants being offered for £113 ish with free delivery from Germany maybe worth a look.
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Re: Zel's Fleet Blog - BX, Jag XJ-S, Sinclair C5, Mercedes 208D & 230TE, AC Model 70.

Unread post by Zelandeth »

Gibbo2286 wrote: 11 Mar 2025, 13:10 On ebay this morning I saw a mufller for one of the Trabants being offered for £113 ish with free delivery from Germany maybe worth a look.
Thanks for the heads up on that. I've been directed towards someone relatively locally who fabricates stainless systems, so I'll likely be speaking to them shortly. The car will be going up on the ramps later in the week to have some welding done, so I'll take the opportunity to have a closer look at the whole system to see if we're looking at wholesale replacement or just the one section.

-- -- --

The throttle cable routing I'd chosen didn't work. It put enough tension on the cable that it wouldn't return fully to idle properly. Helpfully I did realise that there was *one* thing in the right area I could just zip tie the cable to - one of the springs that holds the rear of the engine shroud on.

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That seems to have done the trick.

I noticed yesterday that she seemed a bit unwilling to initially rev up from idle from a sharp throttle input - that to me says "I want more fuel." Adding choke immediately made things better, which added further credence to my logic.

It's easy to tweak the base mixture setting on this carb as there are several (five?) notches which determine the needle height relative to the slide. It was set to the highest slot as supplied, which is the leanest option. I've moved it down by one notch (which effectively lifts the needle a bit), and that definitely seems to have made the throttle response snappier. I'm actually pondering going a slot further then reading the plugs after a few runs - two stroke engines being what they are given the choice I'd always choose leaning towards rich than lean. The odd fouled plug is far easier to fix than melted pistons!

Another horrible mid rev range buzz has been eliminated, which turned out to be the heat exchanger touching the air dam under the bumper. A very clearly not new rub mark there tells me that mine isn't the first bit of exhaust to do that. A little brute force was applied and has given a bit of extra clearance.

She seems to have settled down a bit now things have worn in a bit.



Still a decent number of things on the to do list, but we're getting there!

Fitting the new door window seals so they STOP FLUFFING RATTLING is probably next on the list. Preferably before the driver's door one erodes my sanity too much further.
Current fleet:
07 Volvo V70 SE D5, 85 Sinclair C5, 84 Trabant 601S, 73 AC Model 70, 62 Rover 110.