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22/02/2004 13:49:31   ian f   Apologies if I'm covering old ground. Does anyone have a list of the recommended jet sizes for a Weber 34ICH to be used on a V4?
TIA  
23/02/2004 23:22:27     Gower & Lee set them up with :-
155 main jet, 175 air corrector, 50 or 55 idle (depending on engine condition), 50 pump jet, F6 emulsion, 1.75 needle valve.
I have just been given a secondhand carb and have just obtained this info. On the other hand Jack Ashcroft very kindly e mailed me the following:- main jet 165, air correction 190, emulsion tube F6. Hope this is of some use.  
23/02/2004 23:25:20   Paul   Gower & Lee set them up with :-
155 main jet, 175 air corrector, 50 or 55 idle (depending on engine condition), 50 pump jet, F6 emulsion, 1.75 needle valve.
I have just been given a secondhand carb and have just obtained this info. On the other hand Jack Ashcroft very kindly e mailed me the following:- main jet 165, air correction 190, emulsion tube F6. Hope this is of some use.  
24/02/2004 07:00:11   ian f   Paul,
Thanks for the info. Any idea of the venturi size?
 
24/02/2004 18:33:39   Alistair   Is the US spec going to be the same given that it will relate to a detuned, low compression 1700 engine?  
24/02/2004 19:16:20   Paul   The spec Jack gave me was for a standard 1498 cc witch was what I asked him for. The venturi / choke I is 27mm.  
24/02/2004 19:30:17   ian f   Good point Alistair, but the 1500 engine was available in the States as well as Europe. I can't imagine that Jack Ashcraft would quote figures for anything detuned...his jettings are larger than those used in the Gower and Lee set-up which suggests that his setting would give more at the top end....whether bottom end tractability is affected is something that I'll probably have to wait to find out for myself.

It's possible that the variation in jet sizes is due to the setting up of carbs with different sized venturi. I've seen 34ICH's with 25, 27 & 29mm venturi (anybody know the plural of venturi?).

At last year's SAS, an elderly gentleman told me that his 96 was transformed by the recent fitting of a new 34ICH intended for a 1700 V4 Transit.
 


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