Brian,
If the problem occurs only after the system starts using all the injectors, insufficient flow capacity of the primary injectors should not be the cause. The flow required of them is now significantly less than it was when only the primaries were in use. In flight, the total fuel requirement would be larger at the same MAP as on the ground since the RPM is greater (assuming a fixed pitch prop). So it might be good to check for something limiting the total fuel flow. The fuel filter would be one thing that comes to mind. Did you happen to notice the fuel pressure before and after the problem shows up? The fuel flow rate indication from the EC2 probably wouldn’t be very useful for checking on this.
Steve Boese
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of bktrub@aol.com
Sent: Thursday, November 11, 2010 9:02 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Improved performance of my new (2009) intake manifold
Staging takes place at bin 90- it was stumbling and surging on the ground when I would run it up through this bin- until I richened it up in bins 90-92. Then it would transition without a hiccup through these bins. I had all the injectors cleaned and flowed prior to installation, they all checked out fine. I have 28 lb primaries and 40 lb secondaries.
When I was flying, I was flying around at bins 70-80, doing around 90-110 mph, and would advance the throttle through bin 90 and start the backfiring. While it was backfiring, I would lean and richen the mixture with the mixture knob, but the engine would not settle down and the mixture graph would be bouncing around due to erratic firing. The answer is there somewhere, I jsut have to get some more altittude to fiddle with it in a more leisurely fashion.
Again, Anyone remember what values they use to set the mainifold scale factor and sensor offset?