More Weber 40 IDF Questions
Posted: Tue Jan 09, 2018 10:42 pm
I'm sorting the Italian Weber 40 IDF carbs on my new to me '65 356C and had a couple of questions.
1. I've got a serious flat spot when I "get on the throttle" and even in less aggressive driving especially from a standing from start (seems to be a common issue). I'm still sorting through what size jets and emulsion tubes I've got as well as accelerator pump volume. I'm also replacing the distributor which is an 022 "reproduction" (really a modified 009 as several have told me) with a proper 022 so I'm betting a lot of this will help. If that doesn't solve it I was going to look at adjusting accelerator pump volume. My carbs use a cam vice the threaded rod to regulate flow and I read somewhere here (can't seem to find it anymore) that it was possible to adjust the volume without having to actually file / re-profile the accelerator pump cams. Does anybody know if that's true and, if so, how do I do it?
2. I know Webers need a heavier return spring or in some cases I've seen 2 springs per carb. I have two of the "factory" round springs that fit over the throttle shafts and would like to install them both on the rear of the carb (as viewed from the engine compartment). It's a simple install with the right side carb as it's set up just for the arm / spring but I'd also like to install a spring on the left carb next to the throttle arm. I looked for a left side (mirror image) spring with no luck. I was also trying to see if there's a way to modify the spring and potentially notch the left arm to make it work. Has anybody found a solution to doing this and gotten it to work? Are there round springs that are left and right that somebody has come across?
https://imgur.com/a/hipDY
Sorry for the dumb questions but thanks in advance for any help.
Greg
1. I've got a serious flat spot when I "get on the throttle" and even in less aggressive driving especially from a standing from start (seems to be a common issue). I'm still sorting through what size jets and emulsion tubes I've got as well as accelerator pump volume. I'm also replacing the distributor which is an 022 "reproduction" (really a modified 009 as several have told me) with a proper 022 so I'm betting a lot of this will help. If that doesn't solve it I was going to look at adjusting accelerator pump volume. My carbs use a cam vice the threaded rod to regulate flow and I read somewhere here (can't seem to find it anymore) that it was possible to adjust the volume without having to actually file / re-profile the accelerator pump cams. Does anybody know if that's true and, if so, how do I do it?
2. I know Webers need a heavier return spring or in some cases I've seen 2 springs per carb. I have two of the "factory" round springs that fit over the throttle shafts and would like to install them both on the rear of the carb (as viewed from the engine compartment). It's a simple install with the right side carb as it's set up just for the arm / spring but I'd also like to install a spring on the left carb next to the throttle arm. I looked for a left side (mirror image) spring with no luck. I was also trying to see if there's a way to modify the spring and potentially notch the left arm to make it work. Has anybody found a solution to doing this and gotten it to work? Are there round springs that are left and right that somebody has come across?
https://imgur.com/a/hipDY
Sorry for the dumb questions but thanks in advance for any help.
Greg