I could not run in speed/density because of the resolution of my fuel and spark map was not adjustable for vacum. The cylinders will balance pretty close with the uni-sync. I set the venturi at the lowest pair and target that with the rest.The fuel on the underside of the throttle blade is reversion. The air moves up and down in the runner alot. I am thinking like 4 or more inches. I have tried pointing the nozzles up like F1 engines and it sprayed fuel out of the runner. Ugly. I have had made more power with constant flow fuel injection that way. Maybe I could not get the nozzles low enough with the fuel rails. Oh well I gave it a shot. Maybe more than 4 inches. Read it, never measured it.

I tried to get my nozzles down as far as I could and angeled as steep I could. If its reversions I will live with it, if its the backfiring I will try to get rid of it.

What do you think of my idea of a bypass channel (between over and under the throttle plade) with an adjust screw regulating the air flow? This would make synchronization adjustments even more accurate?

Hi, I think bypassing air around the blade will just be defeating the purpose of the blade. Use your stops, splitters and cross shaft to control air metering.

I have now recalibrated the throttle plates (tapping with a screwdriver) and got an idle of 900-1000rpm with the throttle a little open.

Changed the timing to 20 degrees and this was making alot of difference. I now can have a idle AFR of ~14 without the irritating sneesing up thru the intake ;)

Getting there...

I/r
 

Glad to hear your system is responding favorably to your changes. :thumbsup:

I have now found what I think have made the adjustments more difficult than it should. The intake gaskets was leaking from underneat on all cylinders except one. Air and oil has been sucked this way, alot on a couple cylinders as it looks :(

Hopefully fixing this will getting things even better!