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Solex "Doppelvergaser" (double carburettor)


markmac
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Early on ALPINA used Weber's in their street engines and then at some point changed over to Solex - not sure exactly why they did that, maybe someone knows??? Perhaps the Solex's were more "user" friendly? The 2002ti's used the solex PHH version, these are the ADDHE's which I believe are more on the performance end (maybe someone out there can straighten this out for me ..... ).

http://www.alpinabmw2002.com/

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If I had to guess I'd say they wanted a German carburetor rather than Italian. The Solexes are also a bit more sophisticated than the Weber design so maybe it was a better carburetor to "live with" for a car that you actually drove on the street every day.

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There very little information on the Solex carbs and BMW Ti anywhere. From what I understand, the ADDHE was an improved version of the PHH.

Most of the side drafts (webers,dellorto,solex,solex/mikuni) share the same bolt mounting pattern and will interchange, so its often hard to tell what originally came with what or if a particular carb came with a particular manifold or car. (I don't know the Alpina stuff, I go to Markmac's signature for that stuff- LOL).

To me, it seams odd that they would use Webers on the TiSa, BMW's M10 "big boy", and not use the Webers on the Alpina's also.

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allow me to add to the discussion and contribute a bit of confusion. it is my understanding that the original Solex DDH preceeded the Solex PHH carburetor. Both are german-made and made of very heavy die-cast zinc. The Solex ADDHE are Italian made and made of lighter aluminum.

Contrary to the nomenclature, Mikuni PHH's are in fact closer in design to the Solex ADDHE rather than the Solex PHH. why they swapped designations i don't know.

Mercedes Benz 190 SL's used Solex PHH with 44mm venturis and an automatic choke feature and did not have the spring-loaded baffle on the butterflies like the Solex PHH 40's used on the ti's. According to Harry Bieker (an old time carb rebuilder) the MB folks find the PHH 40's highly desireable for rebuilding and converting to MB application.

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Mercedes Benz 190 SL's used Solex PHH with 44mm venturis and an automatic choke feature and did not have the spring-loaded baffle on the butterflies like the Solex PHH 40's used on the ti's. According to Harry Bieker (an old time carb rebuilder) the MB folks find the PHH 40's highly desireable for rebuilding and converting to MB application.

The MB Solex PHH 44's had a "primary" throat and a "secondary" throat (like a typical 4bbl "muscle car" carb) as stated above by jerry.

Heres a link,

http://www.190slgroup.com/tech/images3/solex-p44.pdf

I can see why the MB folks would want the PHH 40's as they don't have the "primary" and " secondary" throttle plates.

Just some more confusion to add....

It seams odd that the MB 44 PHH and the '02 40 PHH would share the same PHH model designation. Yes, they are very similar, but they are also VERY,VERY different.

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...more O T ..and way back when I was a line tech for Mercedes-Benz,

the then 10+ year old 190SL's were famous for worn body/shaft

carb bodies - and getting a 190SL to idle smoothly was abittch

Might be 'collectible' today? but back in the early 70's, they were

avoided like the plague- and talk about rusting!!!! an 02 is rust free

construction by comparision!!

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The Solex twin-choke carbs seem to work really well until they wear out, then are a pain to try to get adjusted.

Back in 1984, a friend of mine installed a set of 40P11's (downdraft) on his VW Fastback (VW 412 engine) and it popped and snapped enough to drive him crazy. I believe the carbs were originally from a Porsche. They did have very tall velocity stacks. He replaced them with a set of new Weber 40 IDF's.

FastbackengineMay84.jpg

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