"G.R. Patterson III" wrote in message
...
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.

Since you don't have a constant-speed prop, don't worry about it. That
curve's just to keep you from over-boosting. With your fixed-pitch prop,
your rpm won't get too low.

John Lowry
Flight Physics