Edelbrock Carburetors?
I'm betting you are going to be too lean with the 1406 out of the box jetting.
Even living at over 5,000 feet I had to jet up from it.
Ding Ding Ding Ding, Winner!
Power Mode: Lean.
Cruise Mode: Seems about right.
Idle: Tuned to 12.9 ~ 13.5. It jumps around continuously.
WOT: Didn't even attempt it. Too lean during Power Mode, so I was not excited about what might happen at full power. Gonna richen power mode and try WOT only after that.
First thing I'm going to do is put a firmer step up spring in it. This would pull the rod out of the main jet at higher vacuum levels (than the current one), bringing on the fuel sooner. If that doesn't richen it up enough, then I'll consider rods / jets.
But the one thing guys complain about on the Edelbrock quite commonly, I see this problem also. Just after consuming the pump shot, it goes too lean. Even at max pump shot, it still spikes lean. And can lead to a stumble. Mine did this on the 1407, and is doing it on the 1405. For those without an AFR, this happens at about 1.5 seconds after beginning to accelerate away from a stop.
I have a theory on how to improve this. The theory is this. What if the "step" on the rod were higher up on the metering rod. Higher up meaning closer to the bend in the rod. In this way, as vacuum is lost on an initial acceleration, and spring begins to lift the rod out of the main jet, the step arrives in the main jet sooner. And thus more fuel, thus no lean stumble.
Does anyone else think this might work? I could *possibly* have some custom metering rods machined to test this theory.
7milesout
