ORIGINAL: ThumbSkull
ORIGINAL: 1QwkSport2.5r
I have cylinder heads I can modify (cut most of the fins off) to use as a break-in head
The cylinder is one of the main components that needs breaking in.
I know the cylinder is one of the main components that needs breaking in. I've ran glow engines in cars for 14 years and airplane engines (on airboats) for going on 3 years now. If the engine uses a head button, swapping on a different heatsink wont effect the break-in of the piston/liner. Even if a different head button is used, that isnt going to have a dramatic effect on the break-in of the piston/liner unless the engine doesnt get to operating temp.
ORIGINAL: acdii
What Thumbskull said was my first thought too. Your engine would run cold, and not work properly. Years ago I had a Heli engine that I used in a plane, I could never get it to run right in the plane, but ran great in the heli. <div>
</div><div>Why not attach a flywheel to it instead? Use the clutch setup you normally would, and use a large balanced weight for the flywheel. Drive it with a belt. You wont have the hazard of a prop exploding, and you can run it up to top speed. </div>
The flywheel would have to be rather heavy (and probably large) to use alone, and if putting a sprocket on it to drive a separate propshaft and drive by belt or chain would need some careful and precise engineering of which I dont have the tools to do. Running a flywheel alone would be ideal, but it would need to be heavy - probably 2-3lbs or more to provide enough load to not grenade the conrod. Think Dynamometer here... The conrod is usually the first to go when doing a shaft run; which is essentially what one would be doing running an underweighted flywheel like what would be used in a car or truck.
I suppose a "car" jig using the standard car clutch and flywheel, and fashioning a spur gear setup to drive some sort of "load" would work. This is far more complicated than I would want to get into but it could be made to work.