Bristol Cars - Owners and Enthusiasts Forum

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-   6 cyl Bristol cars (http://www.bristolcars.info/forums/6-cyl-bristol-cars/)
-   -   Weber 34 ICH carbs (http://www.bristolcars.info/forums/6-cyl-bristol-cars/2014-weber-34-ich-carbs.html)

GlennBurnage 18-12-21 07:12 AM

Weber 34 ICH carbs
 
Might any of our members have any jetting/general info on Weber 34 ICH carbs used with a Bristol engine instead of the ususal Solex set-up? Any info gratefully received.

Geoff Dowdle 18-12-21 10:22 AM

Glen,
There are at least three different versions of Weber 34 ICH carburettors.
Unlike the Solex that have removeable venturis the 34ICH venturi are fixed.
There are versions with 25mm , 27mm and 29mm fixed venturi .
Over many years I have fitted the 27mm version to 400 , 401, 403 , 405 and 406 .
I have heard that Bristol engined AC, Arnolt , Cooper , Frazer Nash and others fitted with Sports Engines use the 29mm version .

A standard 85 engine could be best fitted with 25mm versions.

Pls confirm the type of engine , compression , camshaft ,etc and I have the jettings that would be a good starting point .
The car would then need to be dyno tuned to check mxtures and ignition advance through the rev range .

Geoff


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