Cold Weather PreHeating

On Feb 5, 11:46 am, David Lesher wrote:
writes:
That would be wise. I wish someone would certify a simple
preoiler for these engines.

I rather liked the idea of something that you stuck down
the dipstick hole and oh, blew compressed air in, I guess;
in any case spraying oil here there & everywhere...

[Not to say it would work, but it sounds intriguing...]

Hmm; how about a spiral shaft that you spin on a drill?
The end dips into the pan....
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The Lycoming has some of narrow slots in the bottom of the case under
the camshaft, and below that is the oil pan. The idea is to keep
engine vibration from throwing too much oil up into the rotating
machinery, while allowing the oil flung off the crank to drain. The
oil fog might have some difficulty reaching the camshaft, and cold oil
won't fog much, anyway.
Too much oil mist or spray overwhelms the oil control rings on the
piston. They can't scrape it all off at the piston speeds encountered
at higher RPM, and begin to float on it. The oil gets into the
combustion chamber and is burned, making smoke, using a lot of oil,
and carboning things up too much. It's just one reason worn-out
engines will use more oil; the bearings get looser and allow more oil
past them, which is then thrown into the cylinder. The oil pump is
made about four times larger than necessary to allow for this
increased flow as the engine wears. Early on, the excess is dumped
through the relief valve back into the case, but as things get old the
relief valve passes less and less until it's shut altogether, and now
you'll see the oil pressure start to drop.

Dan