Weber winter project

[talos]

The best place to start is with your camshaft. Basically the LSA should be between 112-114. Compare that with your cam. I'm sure there are many people on this forum to give you the correct grind. To get optimum results you most likely will have to change it. There is plenty of info on this forum, the web, and you tube. Do your research thoroughly. This will be a project but fun if done with patience.

[Gaz64]

Originally Posted by talos

You will have to start with the cam. The LSA should be between 112-114. Compare that with your cam. Most likely you will have to change it. There is plenty of info on this forum, the web, and you tube. Do your research thoroughly. This will be a project but fun if done with patience.

That is a myth. The reason and pure coincidence of the camshaft timing is the opening and closing points of the intake valves.
For example, ending up with an ICL of 112, and generally with a LSA of 112, I can still have crazy intake valve timing of say 54/90? ICL of 112, LSA of 112.

I have run Webers on IR manifolds, one choke per cylinder, with cams right down to 105, and still have near EFI drivability. That was a 40/70 intake timing.

Since the OP says his engine idles nicely now, the cam mustn't be too wild.

[1795]

One of the more important issues that you need to be on top of is the linkage for the Webers. Most people spend undue time tinkering with jetting, chokes, etc., when the real issue was that their linkage was not correctly setup and the carbs were operating at slightly different throttle responses. After you have it installed move the throttle lever and watch for any inconsistencies or torquing of the assembly. You may have to add additional support to the bell crank depending on the style. If anything even moves a 1/16" out of sync with the other carbs, it will not run right and changing jetting will not fix it.

Good luck,

Jim

[Pmccooey]

Originally Posted by 1795

One of the more important issues that you need to be on top of is the linkage for the Webers. Most people spend undue time tinkering with jetting, chokes, etc., when the red issue was that their linkage was not correctly setup and the carbs were operating at slightly different throttle responses. After you have it installed move the throttle lever and watch for any inconsistencies or torquing of the assembly. You may have to add additional support to the bell crank depending on the style. If anything even moves a 1/16" out of sync with the other carbs, it will not run right and changing jetting will not fix it.

Good luck,

Jim

Thanks for the help. I noticed the linkage has some ‘slop’ to it. Is there a good recommendation for a more precise or tighter throttle linkage that I can go to?

As to the other posts about the cam, I have read that Webers like a milder cam. Like I said I don’t know what cam is in it but it’s not radical. Very easy idle so I would assume it should be no problem with the Webers.

[1795]

Post a picture of the throttle linkage so we know what you are working with. There different linkage setups available.

[talos]

Technically you are correct, but I was just trying to simplify his process and give him an important starting point (the camshaft). It's not fun especially on a fe putting everything together and then finding out you need a different camshaft for the application.