Classic cars forum & vehicle restoration.

[petelang]

I'm appealing for any information anyone might have about Claudel Hobson carburettors. In particular an updraft model "V36" which was a type favoured In early 30s on a number of Armstrong Siddeley cars.
What would be incredibly useful would be an exploded view or parts view as I have two in unknown condition both slightly different and I'm unsure if either are totally complete.
A description of the workings would be icing on the cake but I'll take what ever I can get.

From what I have established, Claudel wasa French designer, made carburettors for a series of 1920s French cars, Deauvilles, etc and he struck up relations with T Hobson of London and they went into business in automotive engineering. They refined their products and were considered to be excellent and particularly fuel efficient. Much of the production went into early aircraft equipment and that was subsequently where many of their units are found. The unit I have is a thing of great beauty, being made of cast bronze with all brass jets and plugs and as such I'm really hoping to be able to get it working to live again on my Siddeley Fifteen.
I really have scoured around a long time but come up with very little in the way of technical data.
https://i.imgur.com/pJOH5R1.jpg
https://i.imgur.com/Uer9c3H.jpg
https://i.imgur.com/OILePrh.jpg
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Daimler Fifteen 1934
Armstrong Siddeley 15 Long 1933
Daimler V8 250 1969

[bjacko]

Have you seen this on you tube? https://www.youtube.com/watch?v=NTTeDzvF3nc
Manual available here http://www.all-usermanuals.com
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1938 Morris 8 Ser II Coupe Utility (Pickup)
1985 Rover SD1 VDP

[petelang]

Yes Bjacko, I had seen that. The V36 is a more complex unit than this one, although similar principles. I have now got some very early info from the Siddeley Heritage Trust. A one page summary of description of parts and jets, which will help somewhat. I'll try to post it on here shortly for interest for others.
The manuals site doesn't find it.
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Daimler Fifteen 1934
Armstrong Siddeley 15 Long 1933
Daimler V8 250 1969

[Ray White]

Peter.
From what you say, I think you should fabricate something to allow the choke to slightly open the throttle. Whether or not this was how it worked originally, I can't say but it would make sense. None of my vintage cars has had that link.

Does your car have a hand throttle?

Interestingly, my 1949 MG had a separate "fast idle" control cable linked to the throttle for starting. The later SU (as supplied with the supercharger) has the choke/throttle link and as such has made the control redundant.......(that was until I found another use for it.!)

[Crashbox]

The pre-war Morris Minor is fitted with a fast idle control as well as a choke. I find it's best to start the car on choke, advance the ignition, fully push home the choke and bring up the fast idle for a few minutes. The car hates choke beyond starting.
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1989 2CV

1932 Morris Minor S.V. Two-Seater

[petelang]

IProgress so far, I have extracted to seized damaged choke flap, made a new cross shaft and choke disc, hardened the shaft and welded on the actuation lever.
I also managed to extract the sheared off jet on the side of the body and fit a replacement. However, the choke lever acts independently of the cross shaft and (I think) is operated by a spring linking the two. There was no spring fitted, so I used something I found but it doesn't seem to have enough resistance to pull the flap closed with it.
The other photo shows the gap between the two levers which should interact.

https://imgur.com/gallery/MEky1vn



https://imgur.com/gallery/C07hCl31

https://imgur.com/gallery/hSQCS7F

https://imgur.com/gallery/T6iduXp

Ray, I don't know about the hand throttle. Certainly there's no sign of it but all that was robbed off when the Ford engine was implanted many years ago. Its like a jig saw of 5000 pieces, without the picture on the box!
That's why info is so key here.
Instructions in the handbook dictate choke should be fully applied, DO NOT touch throttle, then start and after just a few seconds push choke off half way. The interaction of the levers is pre set to allow correct operation.
Problem here is there is no data on how much throttle should partly open. Is the lever bent? Should something connect the two? Are they the right lever parts?
A picture of a working one would be a godsend.

https://imgur.com/gallery/xdsZXxM

https://imgur.com/gallery/sJR9zwu
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Daimler Fifteen 1934
Armstrong Siddeley 15 Long 1933
Daimler V8 250 1969

[Ray White]

If it works in practice then your spring idea would be an elegant solution. If it needs something more than that then perhaps a link mechanism needs to be thought up. A cam arrangement perhaps?

The fact that the handbook instructs not to touch the throttle on starting would indicate to me that the two things are linked remotely in some way.

Your jigsaw puzzle is more difficult than mine. Although my MG was incorrectly reassembled there are at least many survivors which have been done right. You, I suspect, are having to 'imagine' how it might have looked.

[petelang]

Quite so Ray, and it is made no easier by the fact that no two Siddeleys ever seem identical!
I bought a wreck for spares, only 60 chassis numbers apart, which in itself was a miracle to find, and it had a Claudel carburettor. I thought I was in clover but, its a different model with a completely different choke arrangement, all different jet sizes and different drilling within. Although there are similarities....its, er, different!
At times this job feels like one of those archaeological digs where I'm scraping away a field full of dirt with a teaspoon.
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Daimler Fifteen 1934
Armstrong Siddeley 15 Long 1933
Daimler V8 250 1969

[Ray White]

It may seem like an up hill climb at the moment, Pete, but it will be a credit to you when you get it back on the road.

I bet what will happen then is others will start coming out of the woodwork!