Long story over the winter: fuel pressure seemed to bounce so change the fuel pressure regulator to a low psi Holley and new low psi hi flow fuel pump. Defective FP so changed back to original Carter 7psi FP. (need to return defective FP and will change if fuel pressure keeps bouncing) Added new fuel filter before pump and another cheap clear plastic in-line before the webers ... busy at work, girlfriend and Rotary, Daytona came in 4th. Ran the rich webers for about 1000 miles last year. Now time to get more serious and get them tuned.
I did see the Weber 1-3 tuning on YouTube. Cool looking out fits.
Have read a lot of the internet materials and have the Weber book and want to get a better understanding of the system.
Looks like I am on the right track. Called Jim a while back about the bottom manifold plate for vacuum, initial timing, etc. He did mention potential jetting changes. (BTW, beautiful turkey pan for the Daytona)
As I recall, all of the mixture screws are less than 1.125 turns out. Most are 1/2 to 7/8 turn out. Will double check my notes.
Not surprised that MPG would drop as the car screams when you punch it. But others have stated that MPG was actually better while cruising with a proper tuned set (low speed circuit) of Webers?
Any thoughts about adding an idle screw to carb 3 (cyl 5-6) to set the initial sync for all 4 IDA's? (in other words, using 2 idle screws instead of just one) Since all are connected through the bell crank, will they all accelerate the same or will 3 accelerate quicker than carb 3 (cyl 5-6)?
Also, I read something about initial tuning at 850-1000 rpm and then also checking the low speed circuit at 2000 rpm? If so, would you again turn in/out the mixture screw again for "best lean"?
Will ping Jim after I change plugs and make some runs and report new findings.
Thanks for any help.