Yes, you will have more prop wear. However, if you have an O-320 H2AD, the
most vulnerable thing in the engine are the camshaft and lifters. Idling
below 1000 is hard on them because of reduced oil splash and higher metal
pressures. Better a $500 prop overhaul than the $8000 camshaft replacement
we just went through.

--
Roger Long

Tony Cox wrote in message
ink.net...
"Lisa" wrote in message
...
Perhaps this doesn't matter much for a non-turbocharged engine,
but an instructor says that it is best to idle the engine at
1,000 RPM for a few moments before Mixtu Idle Cut-Off at that
RPM to shut down.

The POH says throttle full aft, then mixture cut-off to shut
down.

I run at 1100 RPM just before shutdown, set the throttle
lock, and then pull the mixture back. This way, when I
restart on a cold day, I know that the engine will fire and
idle nicely at 700 RPM without overrevving or conking out.
This minimizes engine wear on startup.

Not sure I agree with posts (from Lycoming recommendation)
which suggest high RPM. Too much risk of damage to the
prop.