Setting up your carbs
Years ago Dave Andrews wrote an absolutely wonderful explanation of how to select the right Weber carbs and how to tune them. You can read it all here: Weber Carb Selection and Tuning
He has also created easy to use software. When you do run it, it will open a window that asks for the size of engine you’re working with. It also asks at what rpm you make peak power (be realistic), and if you are tuning for power or flexibility. Then it gives you typical settings you can use as a baseline for setting up your carbs. When adjusting my new DCOE 45’s, I paid for the assistance of a Weber expert, then put the car on a dyno. Later, I checked our results against Mr. Andrews’ recommendations and found that the little software program was spot on.
I don’t know if this old DOS program will work on your computer, but I can use it on my Thinkpad. If you want to give it a try, please send a note to SNO at gwandrw dot com and ask for the jetting software. I tried to make it downloadable. Unfortunately, because it’s an exe file, Norton and other anti-virus software blocked my page and labeled me a threat.
Cylinder Head Repair Warning
Below is the illustration Alfa Parts created in the early 2000’s, to send out with 2-liter Victor Reinz head gaskets. The drawing is used with the permission of Jon Norman, of Alfa Parts, in Berkeley, California. I don’t know if other engine sizes are at risk; that’s a question for Jon or another Alfa engine wizard.
Sealant is needed because older 2-liter motors have oil galleys at the back of the block. Newer 2-liter motors don’t. All head gaskets used to come with sealant around the oil galley holes. Then, Reinz and other gasket manufacturers stopped putting sealant on their head gaskets, probably because the newer motors didn’t have the oil galleys and didn’t need it. So, because there was now no sealant where the older motors required it, the change put those of us who were rebuilding older engines at risk of oil and coolant mixing, unless someone took the time to warn us. Jon Norman was that first someone.
The sealant referred to in the diagram is Permatex Ultra Grey.
Weber carb backing plate; make your own
I did not like the flimsy backing plate that was sold by PiperCross when we were building my 2L engine, so I had one cut from a template made from an ITG backing plate. Mine is slightly modified to fit my 1967 with 2L motor. If you download my pattern, I suggest you make a paper or card pattern to test the fit on your car before going to the time and expense of creating one out of metal. I used stainless steel that was cut by a friend’s waterjet machine.