If you dont have a manifold pressure gauge then you cant properly use
the chart. However, I have only seen ONE aircraft with a fixed pitch
prop and a MP gauge (on a C-152, no less.. talk about a "feature"). In a
factory/certified/STC install one would THINK that the prop is pitched
such that the limit isnt exceeded... but we all know what happens when
one assumes.

I have only seen POH's... not engine manuals...

Dave

G.R. Patterson III wrote:
I've been looking at the performance charts for the Lycoming O-320-B and D series
engines. There's a line that is labeled "Limiting manifold pressure for continuous
operation". This line starts at sea level and 2400 rpm, runs through 2300 rpm at
about 2,000' ASL, and continues to 2000 rpm at about 6,500' ASL. Does this mean that
I am not supposed to operate this engine at 2000 rpm below 6,500' ASL? I have a fixed
pitch prop.

George Patterson
If a man gets into a fight 3,000 miles away from home, he *had* to have
been looking for it.