Technical Weber 30 DGF

[Mike r]

hi all,
just wanted to ask how can i adjust the mixture on that, as the screw faces the rocker cover with almost no gap.
i tried with rocker cover removed...which was a bit oily!
the carb is from a panda 30, on a short manifold and panda head.
thanks

 

[Toshi 975]

hi all,
just wanted to ask how can i adjust the mixture on that, as the screw faces the rocker cover with almost no gap.
i tried with rocker cover removed...which was a bit oily!
the carb is from a panda 30, on a short manifold and panda head.
thanks

You have got the same situation with the twin choke Weber 30DIC carbs. To overcome the problem I took an M6 nut and drilled a larger hole almost right through the nut. I made the hole size a slight interference fit on the mixture screw straight knurled head then pressed what was in effect a hexagon cap onto the mixture screw so now it is easy to adjust the mixture with a 10mm spanner.

 

[Mike r]

that is a good solution Toshi, but my adjusting screw is smaller and lives in a sort of tower casting on the carb body

 

[Bleeding Knuckles]

hi all,
just wanted to ask how can i adjust the mixture on that, as the screw faces the rocker cover with almost no gap.
i tried with rocker cover removed...which was a bit oily!
the carb is from a panda 30, on a short manifold and panda head.
thanks

Hi Mike, I run the same carb with the same problem, the mixture screw is on the wrong side for the 500 fitting and even the original manifold caused problems. I know it sound a bit drastic but you need to reduce the size of the alloy tube that is cast into the carb body to reveal the head of the screw. If you carefully measure the screw head depth in the tube and then mark the same measurement on the outside of the tube - this is your cut line. With the carb off the car using a fine punch mark the top of the screw head, and mark the carb body at the base of the tube with a corresponding mark. Then whilst carefully counting the rotations remove the mixture screw and cut the tube at the mark with a small hacksaw. You must flush the carb to remove the metal debris, replace the screw counting back and align your marks. To make any adjustment use a spare screwdriver bent over at 90deg (ish) and cut to length. It's a faff I know, but it works for me - if any adjustments need to be made.
Ian.

 

[Mike r]

hi Ian,
can the carb be rotated 180deg? so the adjusting screw faces the other way?
thans

 

[Bleeding Knuckles]

hi Ian,
can the carb be rotated 180deg? so the adjusting screw faces the other way?
thans

Hi Mike, In theory yes, BUT you will have to reroute the choke cable and the main linkage will have to be refitted. Both of the cables for throttle and choke are 'pulling' to activate if you rotate the carb you will have to sort out links that 'push' or move the link arms under the axis of the throttle and choke spindles so that you can 'pull' as normal. Also remember that the primary throttle venturi tube is nearest to the valves and the choke actuates through this venturi too, the second venturi just dumps more mixture into the manifold at the required throttle position. Fiat arranged the position as is and I wonder if rotating the carb would upset the mixture ratio at all?? Are you running with standard jetting or have you changed them at all?? My jets have all been changed to the next size up to help with cooling during running in, I will have to adjust jetting on a rolling road probably, but the car starts and runs well as is. Another point is that I am running with a Panda 30 head and don't know if that affords me any more room or not??
hope this helps.

Ian.