left and right webers

miles mulloy · 11-25-2003, 05:17 PM

I bought a used set of 40 idf webers for my 1967 912.

is there a left and right carb? I`m trying to assemble the linkage

and it appears I have two right side carbs

Miles

bemumford · 11-25-2003, 05:39 PM

Several years ago, Weber quit building left- and right-side carbs. They now build them all alike, and the customer must make them right and left. Two things are required:

1. Take the fuel inlet plumbing off one carb and turn it around so the inlet tube (on which the rubber flex tubing fits) faces the front of the car on both carbs. (Yours may already have had this done.)

2. Remove the 11 millimeter nuts from each end of the throttle shaft on one carb and swap the linkage arms so both carbs have linkage arms that push down when connected to the linkage rods on the car. (Watch out for washers, springs, and other stray bits that may fall off the shaft when you do this. It's not difficult if you're aware that there will be a little loose hardware.)

Re-reading this, I see that it's not as clear as I would like. For better (and more complete) directions, I recommend Bob Tomlinson's Weber Tech Manual available from CB Performance for $10 or sometimes on ebay for a buck or two less. You can order from CB Performance either by phone or online.

Ed Mumford
67 Targa

miles mulloy · 11-25-2003, 05:50 PM

Printing -- Reading and tinkering

I`ll let you know how its going.

Thanks again for the quick responce

Miles

ron69912t · 11-26-2003, 09:16 AM

Miles:
When I installed a new set of 40IDF Webers I did those things too but also had to remove the choke mechanism and put the blank plate over the hole on the right hand carb so it did not hit the fan shroud which would not let it sit flat on the intake manifold.

Don't know if this was already done on your RH Weber or not.

Thanks,
Ron D

miles mulloy · 11-26-2003, 09:38 AM

Ya I ran in to that problem too. Did the same thing you did. But the linkage problem is a real pain, the carbs did not come with the parts for the carb to linkage conection. I ordered the parts and still do not have all I need. The return spring for the left side must go to the front side of the carb and I don`t have the hardware for it. I guess I can fabricate something. I`m starting to think I should of bought new ones.

miles mulloy · 11-26-2003, 09:43 AM

Ed Mumford writes "swap the linkage arms so both carbs have linkage arms that push down when connected to the linkage rods on the car."

This is not going well for me at all Ed. Still tinkering.

Miles

ron69912t · 11-26-2003, 11:03 AM

Miles:
The linkage arms on my new 40IDF Webers were interchangable ie. could be attached to the left OR right side of the carb. In any case the arms need to be to the rear of the car and open the throttles by pushing down on them. I used my existing linkage (69 year) just had to readjust the lengths of the pivot points.

Maybe older Webers are different.

Good luck,
Ron D

bemumford · 11-26-2003, 01:24 PM

Miles,

I neglected the matter of the throttle springs in my earlier post. I abandoned the Weber throttle springs entirely in favor of the coil springs used on Solexes. If you don't have an old pair of Solexes on hand, you can buy new springs from Stoddard's (Willoughby, OH) for not much money. I think I paid something less than $3.00 apiece, and their shipping charge was minimal. I removed the Weber springs entirely. Then I drilled a hole in each of the throttle arms for the new spring and clipped the other end (the top) over the flange in the lower air cleaner housing. It seems to me that you can find photos elsewhere on this bulletin board showing similar installations. Ron D. may have posted one. Look up all the Weber posts, and I'm sure you'll find photos.

Good luck,

Ed

ron69912t · 11-26-2003, 02:19 PM

I used two coil springs attached to the air cleaners with a small clip I made out of sheet metal.

Thanks,
Ron D

miles mulloy · 11-26-2003, 03:01 PM

Great looking engine Ron - I still have my solex carbs and lots of parts to work with,

Thanks for the info

Miles

mpetry · mpetry's Garage

Depending on which Webers you have - early or late - the reversal of the fuel inlets may require a trip to the machinist. Later model 40IDFs have a threaded fuel inlet - earlier ones are pressed in and will require that the "other" side of the right hand carb's fuel inlet block be drilled and tapped to accept the fuel inlet and block off the back side.

Mark Petry
Bainbridge Island, WA
'68 912

miles mulloy · 01-24-2004, 10:14 AM

It took a little bit of machining but not too much nothing that I couldn't handle with a half-inch drill and a grinding bit. And it doesn't look that great but it runs the best it has ever run.

I do want to say thanks to this board and the people who posted your help was very much appreciated in those first few days when I thought I had bought two right side carburetors.

Thanks again guys

Miles Mulloy