Hail to "Brian the Mythbuster"....
I knew that "Tapered Bore break-in" was hogwash from the get go.
1. The engine expands out of the pinch in 3 seconds after starting.
2. It is not possible for an engine to "seize" back into the pinch at 80
times per second while running.
3. Most engines that have been run and are hot will not cool down enough
to return to the pinch for several minutes.
4. Control line flyer's start-up and run ABC type (ringless) engines in a
full rich four cycle for the life of the engine without mishap.
5. When a ringless engine is running, the oil between the piston and cylinder
makes the seal. There is no metal to metal contact.
6. The new ABC type (ringless) four cycle engines obviously run in a four
stroke manner for their lifetime without any problem.
I removed the muffler to check the piston. There wasn't a mark on it
(even using a magnifying glass), nothing to indicate that the top portion below
the crown had been subjected to any torture whatsoever.
I run my engines on 1/3 castor as well, there's a reason for that....heh heh.
Good job, downunder....keep flogging that engine for awhile.
FBD.
