On Wed, 31 Mar 2004 06:31:51 -0600, "Dan Luke"
wrote:


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

Which is best?


According to Lycoming Service Letter L192:

"Prior to 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."

Does the Lycoming service letter explain what running at 1800RPM
accomplishes?