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

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.