Chuck....What I am saying is, and downunder has set out to prove is, a normal
ABC engine will not be harmed by running it overly rich....fourstroking it....during
the break-in period. (or any other time for that matter)
The terms do not matter....overly rich, sloppy rich, super rich, way too rich, rich
as all get out, stupid rich....
We're not even saying that four stroking the engine is a good thing. We know that
running an engine too rich, and too cool is defeating the purpose of trying to brake-in
the engine in the first place....because it will extend the break-in period unnecessarily
as well as wasting expensive fuel.
I do not break-in my engines overly rich....in a four-stroking mode. I have on
occasion, after a break-in run....cranked the needle way out....into a four stroking
mode for a few seconds to cool the enging down a bit before I shut it off. Of course,
it did not harm the engine.
I doubt that downunder runs his engines overly rich on break-in either, I know for
a fact he is an experienced aero-modeler.
What we are saying is....rediculous statements like:....
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"It must not be allowed to run for any length of time in four-stroke mode,
during the break-in."
"Also, in every non-firing revolution the piston is pushed, into the seize at the top
of the bore and then pulled back down, out of the seize, by the conrod. These
repeated compression-tension cycles can ultimately cause the conrod to fail."
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....aren't going to pass muster. Other old wives tales like....never let an engine idle
during the break-in period....will be debunked as well.
downunder's Quote:
Many's the time I've seen someone write in saying they've just run their
new engine (always sport engines) too rich and you've immediately told them
they've probably ruined it.
The bottom line is, I'm not going to stand by while someone uses scare tactics on
some poor kid asking about breaking in his new engine (that he probably spent
his life savings on)....by telling him the factory instructions are incorrect....and
unless you follow my instructions in "this thread" you will damage or ruin your
engine.
That's when Flyboy dave throws his hat into the ring.
FBD.
