Forum Query: Manifold pressure

Context:  Fixed pitch prop / fuel injected engine without any sort of boost / CH750

Necessary gauge or not?  Pro's or cons...let's hear 'em!

My list:  Pro - Another engine monitor indication, short and long term data for engine health monitoring,

              Con - Potential intake manifold leak point for sensor, minimal additional weight and complexity.

Dave

Views: 284

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Replies to This Discussion

Permalink Reply by Rick George on May 14, 2014 at 12:57pm

 I use the manifold pressure to set the throttle in both the RV4 and the CH750 (both fixed pitch)- it is much quicker that using RPM.

Permalink Reply by Louis W. Ott on May 14, 2014 at 4:18pm

I have a 601XL-B with Corvair power. I use manifold pressure as my primary power indicating instrument.  22" descending, 18" in the pattern, 15" on initial final, etc. RPM changes too much with airspeed.

Permalink Reply by David J. Beaulieu on May 16, 2014 at 3:22pm

Thanks guys...been a while since I've flown piston stuff, but I recall thinking that MAP was useful for power setting in conjunction with RPM.  Guess I install the hose and sensor to give me MAP on the Dynon.

Cheers!

Dave

Permalink Reply by Bob Pustell on May 16, 2014 at 5:00pm

If you have a constant speed propeller you do use the manifold pressure and RPM together to manage the engine. With a fixed pitch prop you can make do with RPM (and most light aircraft do) but you get better, more stable and more consistent power management with Manifold Pressure, even with a fixed pitch prop. Most light planes don't have MP because not putting the extra guage in saves the manufacturer money and weight as they build the plane.

Permalink Reply by David J. Beaulieu on May 18, 2014 at 1:30pm

Thanks Bob...appreciate the insight.

Dave

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