Shutting down engine Question

On Wed, 31 Mar 2004 10:25:02 GMT, "Roger Long"
om wrote:

This is the procedure we use on our O-320 and have had noticeably smoother
and quicker starts since we started it:

RPM - 1200
Lean for maximum RPM rise. (Don't worry, no amount of leaning will hurt the
engine at this low power)
Run 20 seconds
Throttle - Quickly to Idle
Mixture - Idle Cut Off
Switches - OFF

Leaning for all ground operations is vital to keep the mags clear on this
engine. On startup and after exiting the active runway, set RPM to 1000 and
lean slowly for maximum RPM rise. This will often be about 100. Lean
slightly past until RPM just starts to fall. If the engine runs a hair
rough, that's OK. It will be lean enough that it will start to stumble and
quit if you try to run it faster than about 1300. This means you can't
accidentally take off with it leaned.

Since we started doing this, I have only had to clear a mag a couple of
times in two years.

Roger Long

Roger, when you say "clear a mag" do you mean clearing plugs? Because
it isn't the mag that fouls, is it? Isn't it the plugs?

Thanks, Corky Scott

Yes, it is the plugs. Since you switch a mag off people often say clearing
a mag even though it's sort of like saying "digging a shovel".

Mags do foul for very different reasons but the only way to clear them is
with a wallet.

--
Roger Long

Roger, when you say "clear a mag" do you mean clearing plugs? Because
it isn't the mag that fouls, is it? Isn't it the plugs?

Thanks, Corky Scott