Running motors dry

[Michael Ramsey]

The Special Today is: Spam, Spam, Eggs, Spam and Spam, with a side of Spam.

He he, Michael...


----- Original Message -----
From: "Dean Pappas" <d.pappas at kodeos.com>
To: <discussion at nsrca.org>
Sent: Monday, September 27, 2004 11:12 AM
Subject: RE: Running motors dry



Hi John,
Once the engine has been run, there is always plenty of oil in it. Run it
dry at idle, and no overheating occurs. I like Mobil 1 the best, for all the
reasons Matt mentions, but use the Amsoil MP in the two-stroke for ease of
starting at the beginning of the next flying session. For a YS four-stroke,
use no castor. For my two strokes, I use the standard mix S&W, which has a
couple of percent of castor. Plug life, with these two lubricants hasn't
been an issue. On the other hand, if you go to WOT with tons of oil still in
the engine, and it knocks, the plug will get beaten up.

Also John,
I've noticed that when I tried to e-mail you directly, your server bounced
me, suspecting that I'm spam. That reminds me of a Monty Python skit ...

Dean Pappas
Sr. Design Engineer
Kodeos Communications
111 Corporate Blvd.
South Plainfield, N.J. 07080
(908) 222-7817 phone
(908) 222-2392 fax
d.pappas at kodeos.com


-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of John Pavlick
Sent: Monday, September 27, 2004 12:46 AM
To: discussion at nsrca.org
Subject: Running motors dry


 I noticed a lot of guys like to run the motor dry before putting things
away at the end of the day. This seems like a good idea because you don't
want to leave any fuel in the crankcase. The question I have is what causes
more damage: leaving the fuel in the crankcase or running the engine without
oil (the oil is in the fuel). I also see that Hangar 9 makes an after run
fuel. The idea is to run the motor on this and then put it away I guess. Has
anyone used this stuff? It seems like a better way to accomplish both tasks.
Maybe some of the bearing failures we see could be aggravated by the dry
runs? I know heat is a major factor, but I really don't think it's a good
idea to run a motor without oil. Regarding fuels - Is it better to run pure
synthetic or a castor / synthetic mix? Most of our pattern engines are
ringed so I guess the castor isn't really necessary and the synthetic is
cleaner.

John Pavlick
http://www.idseng.com

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