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Engine basics => Engine set up tips => Topic started by: louie klein on October 16, 2010, 07:44:52 AM
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Hi all, I woke up this morning thinking about breaking in a new Fox .35 I got. Being fuel is exspenive and in some cases hard to get, I wondered if it would be possable to hook up an electric motor nose to nose with the Fox, remove the glow plug and run the motor this way for a certain amount of time before running it with fuel under normal loads. Crazy or what. What'chere thoughts? Thanks ---LOUIE
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People used to do this sort of thing with the old ignition engines. It doesn't give you the heating and cooling cycles that a normal break in would produce. I have a Norvel Big Mig which I took the glow head off, put some Rislone in, and chucked it in my Dremel. Seemed to work fine. I think I was supposed to oil it up and turn it over 100 times by hand.
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Back in the olden days we used to try to break engines with techniques like that. We reuined most of 'em without ever getting a good run.
Tolerances and fits are a lot better than they used to be. Modern breakin is generally not a big deal.
I like to give it a few short bench run with an undersize prop and oily fuel, then go airborne with a faithful test model.
The problem is, fits vary somewhat from engine to engine, so you have no way of knowing how much breakin is needed without actually running the engine.
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Sounds good, Thanks guys!---LOUIE