I'd like some help making sense of manifold pressure readings from my last flight. I'm using the Dynon-supplied sensor with my Skyview system. The engine is an Aero Sport Power IO-360-B2B with Air Flow Performance FM-200 fuel injection and dual P-Mags. Before start-up the MAP reading was 30.0 inches which is 0.6 inches higher than the local barometric pressure. Is that much error typical of the Dynon sensor? I expected less static error.
After start-up I saw 12.5 inches indicated at idle (750 rpm). The weird thing is Aero Sport Power recorded 10.1 inches at idle in the performance section of my engine log book. Why is my pressure more than 2 inches higher? I've checked for an induction leak but haven't found anything to explain it. Could there be that much error in my sensor?
On takeoff I saw manifold pressure peak at 30.1 inches during roll-out which is 0.7 inches above ambient barometric pressure, and decrease slowly on climb out to 29.2 inches before reducing power on downwind. There is some ram air effect from the cowl snout (vertical induction) but I didn't expected to see that much manifold pressure due to the flow losses of the airbox and filter, induction tubes, etc. This pattern repeated for each takeoff. I loaded the log data into SavvyAnalysis so it's easy to review the history.
What should I make of these pressure readings?
After start-up I saw 12.5 inches indicated at idle (750 rpm). The weird thing is Aero Sport Power recorded 10.1 inches at idle in the performance section of my engine log book. Why is my pressure more than 2 inches higher? I've checked for an induction leak but haven't found anything to explain it. Could there be that much error in my sensor?
On takeoff I saw manifold pressure peak at 30.1 inches during roll-out which is 0.7 inches above ambient barometric pressure, and decrease slowly on climb out to 29.2 inches before reducing power on downwind. There is some ram air effect from the cowl snout (vertical induction) but I didn't expected to see that much manifold pressure due to the flow losses of the airbox and filter, induction tubes, etc. This pattern repeated for each takeoff. I loaded the log data into SavvyAnalysis so it's easy to review the history.
What should I make of these pressure readings?