DerbyDad03;3200357 Wrote:
>
> I don't winterize or summerize any of my outdoor power equipment. Snow
> blower, leaf blowers, lawn mower, trimmer, etc. Instead, I start them
> up
> once a month and let them run until they've reached normal operating
> temperature.
>
I think I know why you feel you've had good results by starting all your
small gas engines one per month.
Small gas engines use splash lubrication. Basically, the crankshaft
splashes oil all over the inside of the crank case, including the
cylinder walls under the piston. It's that oil film that helps to
provide good compression when you start any of your small engines.
Piston rings by themselves don't provide sufficient compression to start
a gasoline engine. Piston rings are smaller than the grooves they ride
in, and that allows some of the hot combustion gasses on the power
stroke to get behind the piston ring and push it outward tightly against
the cylinder wall.
It's the pressure of the hot combustion gasses pushing the compression
ring outward against the cylinder wall that provides the tight seal
needed to get the most power out of the engine. But, until the engine
starts, you have to rely on the oil film on the cylinder walls to help
seal around the compression rings to give the engine sufficient
compression to start.
By starting your engines once a month, you're continually recoating the
cylinder walls with new oil so that the next time the engine is started,
there's still enough oil on the cylinder walls to provide good enough
compression for the engine to start.
You could do the same thing by simply shaking a small gasoline engine
(like a leaf blower or chain saw) immediately before you start it at the
beginning of the season, or taking the spark plug wire off of a
rototiller and pulling the recoil starter a few times just to splash
some oil on the cylinder walls. That is, instead of starting the
engines every month, why not simply do something to splash oil onto the
cylinder walls before you start them for the first time each season.
The idea is simply to re-establish an oil film on the cylinder walls
before trying to start the engine for the first time in the season.
Without doing that, the oil film will drain away over the course of
several months, and it won't be sufficiently thick to provide a good
seal around the compression ring, and you'll have trouble starting the
engine cuz of lack of compression.
--
nestork