Maybe there is someone out there could help figure what's going on here.  Yesterday I was at 3,500' and decided to see how fast my O-200 could pull me.  I shoved the the throttle all the way.  When I got around 2,800 RPM (yes, I know the official red line is 2,750)  it started to miss badly.  I throttled back and is was fine.  The OAT was 40 deg F.

I do not see this phenomenon of the ground, or on take off.  It's kind of acting like it did once during a race.  In that case, it was an 80 degree day and in a pinch I had installed spark plugs that were too hot, which led to detonation.

Unfortunately, the accuracy of my EGT sensors are suspect, so I can't rely on any information there.

I am attaching a screen shot of my mixture control table plot. Plots above the flat reference area is a rich mixture, plots below are lean.  For the Continental:

Green = Idle area, 0 through 1,200 RPM, MAP less than 13"
Cyan = mid range,  1,200 through 2,100 RPM and MAP above 13"
Blue = Above 2,100 RPM and MAP determines address.

This mixture tables was pretty much determined in-flight, using a quality mixture meter and I was shooting for 14.7:1 across the board with the mixture knob set at 12:00.  When I was doing the WOT test, the mixture knob was set at about 2:00.

The miss also seemed like a little the vibration problem I had before I stiffened up the trigger sensor mounting bracket.

Any thoughts, guys?

One other question, probably not related.  Is there any way to tell if the temperature sensor is working properly?  What would be the symptoms if it was not?

1 of 1 File(s)