HeyEng
Well-Known Member
So I can tell you ALL sorts of stuff about heavy jet systems, but I am still learning quite a bit about piston stuff.
I was reading a Lycoming reprint about engine RPMs/leaning/etc and came across this:
Prior to the engine shut-down, the engine speed should be maintained between 1000 and 1200 RPM until the operating temperatures have stabilized. At this time, the engine speed should be increased to approximately 1800 RPM for 15 to 20 seconds, then reduced to 1000 to 1200 RPM and shut down immediately using the mixture control.
I am curious about the 1800 for 15-20 seconds...what is the purpose of this? I have never heard about it and am not sure why?
I was reading a Lycoming reprint about engine RPMs/leaning/etc and came across this:
Prior to the engine shut-down, the engine speed should be maintained between 1000 and 1200 RPM until the operating temperatures have stabilized. At this time, the engine speed should be increased to approximately 1800 RPM for 15 to 20 seconds, then reduced to 1000 to 1200 RPM and shut down immediately using the mixture control.
I am curious about the 1800 for 15-20 seconds...what is the purpose of this? I have never heard about it and am not sure why?