Solex carby threads

[wrinklearthur]

Ref; Metrics in Engineering - ISO Metric Threads and Tapping Sizes

Have a look at the variants in the list in the above link.
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[JDNSW]

The ones on my Solex 32PBI S1, and 40PAIO S2 are off the shelf M6x1 (6mm/1mm pitch). .W.

It seems highly improbable that an ISO thread would be used on a carburetter designed in Britain in the 1940s. I suggest that they are probably 0BA, and note the following from Wikipedia:-

"The angle of the thread is 47.5 degrees which is different from that used by Whitworth (55 degrees) and ISO Metric (60 degrees) so BA fasteners are never interchangeable with Whitworth/Metric ones even when the pitch and diameter seem similar (e.g. 0BA which appears similar to M6x1m)"

John

[B.S.F.]

According to my book "British Solex Carburetters" the original Solex carburetters were manufacturesd by Solex ,a french company owned by a Maurice Goudard, in 1913. What threads would they have used? The Brits bought the rights to manufacture the carburetters in1914 .W.

[Defender Mike]

You all get free beers !! Next time i'm in your town ( could be soon heading to Brisvegas for Chrissy)

There is a vast amount of knowledge to be tapped on this site. I will run through these posts with my friend Graeme and see if he has tried all the options mentioned above.,
Mike

[Baggy]

Looks like the same screw on my CD175 carbies on my RRC

Southside Carbies in Mallard Way Cannington WA rebuild Solex carbies from memory and maybe able to advise thread type.

Maybe worth a phone call.....you can only ask Ph: 9350 6677

Cheers

Baggy

[JDNSW]

According to my book "British Solex Carburetters" the original Solex carburetters were manufacturesd by Solex ,a french company owned by a Maurice Goudard, in 1913. What threads would they have used? The Brits bought the rights to manufacture the carburetters in1914 .W.

I was not aware that Solex was originally French. This makes it possible that by the 1940s they were still using French threads, but I think this unlikely. In the 6mm size quoted this has the same pitch (1mm) as ISO and 0BA, and the same thread form as ISO, but smaller diameters differ from ISO.

John

[wrinklearthur]

Ref; Carburetors Page 1

Reproduction Solex 32PBI-2 Carburrettor Ref: 264664D
Application: Series 1 and Series 2 with 2 litre petrol (gasolene) engine. 1954 to 1960 approx.

I have found the tops are completely interchangeable, you can keep the Solex lettering and the original fuel line arrangement that way.

Description: Reproduction Solex 32PBI-2 carburrettor. View of base of carb.



Rebuild kit for Solex 32PBI-2 Carburettor Ref: 266693
Application: Series 1 2.0litre engine 1952 to 1958 fitted with Solex 32PBI-2 carburettor. Zenith part number ZRK17.
Description: A fairly comprehensive kit of parts to rebuild this carburettor.



Gasket Set for Solex 32PBI-2 Carburettor Ref: 274895
Application: Series 1 2.0litre engine 1952 to 1958 fitted with Solex 32PBI-2 carburettor.
Description: Set of 6 gaskets and 8 fibre washers for this carburettor



Float for Solex 32PBI Ref: 260745
Application: Series 1 1600cc & 2.0ltr petrol (gasolene).
Description: Brass float for this carburetor.



This is from only one UK supplier and there are others in UK and Australia, just watch their prices as some are a bit over the top.
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[chazza]

...Solex ,a french company owned by a Maurice Goudard, in 1913. What threads would they have used?

The French had been metricated since Napolean's time, but when metric threads first appeared I don't know - but I do know that a colleague who restored a 1905? Renault car, told me that a brand new metric nut purchased in 1978 fitted perfectly onto the axle, indicating how well things had been made to a standard over the years.

It would not surprise me at all if the Solex has metric threads, given its origin - stranger things have happened; such as Morris manufacturing whitworth-headed bolts with metric threads on them!

Cheers Charlie

[JDNSW]

The French had been metricated since Napolean's time, but when metric threads first appeared I don't know - but I do know that a colleague who restored a 1905? Renault car, told me that a brand new metric nut purchased in 1978 fitted perfectly onto the axle, indicating how well things had been made to a standard over the years.

It would not surprise me at all if the Solex has metric threads, given its origin - stranger things have happened; such as Morris manufacturing whitworth-headed bolts with metric threads on them!

Cheers Charlie

The metric system was introduced to France after the revolution, but before Napoleon, although Napoleon spread it across Europe. Despite this it was less generally used even in France than is often supposed. In France, universal adoption did not happen until after WW2, as the result of the fact that almost everyone was either in the military, or dealing with the military - and they were definitely metric. Look at the UK today - officially metric, but the roads still seem to be in miles for example.

It is difficult to be certain what threads Solex would have used when they started - almost certainly it would have depended on where they bought their tooling from - which could have been anywhere in Europe - and the major industrial power in Europe was the UK, probably followed by Germany; and the USA was starting to export industrial tools. But the probability is that they would have been using French Metric, which in 6mm is the same as ISO.

But manufacturers have always tended to do anything feasible to make it difficult for competitors to make parts to fit their products - and one way of doing this is to use an obscure thread standard!

John