ORIGINAL: HaveBlue
I don't think you can compare car engine break ins to these engines ..the way we run in glow engines is horrendous to me, I still have a hard time running a brand new engine at WOT the mating of parts is done in a totally different way with glow engines they do not have the oil passages that car engines do... run in a car engine at wot and you then have a very good boat anchor!!!
there are different objectives between various engines
example: when talking about the ring.. in glow engines the object is to seat it against the wall..while in a car engine it is important to develope the taper in the ring against the wall
there is far more to it than just this to which I am not prepared to go into here as it gets off topic..but different engines have different needs you cant lump all engines in one basket
I'm sorry my friend....I wasn't ignoring you....I was busy with something
else.
Comparing our ringed glow engines, especially a 4-cycle glow
engine to an automobile may not have been the best analogy. However,
the point was....would you have the engine set to run extraordinarily rich
to facilitate the break-in of the rings ? Of course not.
An automobile engine has two compression rings, one oil scraper ring, and
the oil control rings.
The rings of an auto engine do not come into the concern of the break-in
procedure because:
1. The precision of the clearances in the engine, the cross hatching, the
quality of the rings, and the controlled temperatures that the engine runs
in (water temp) all but eliminates any problems with the initial break-in
(sealing) of the rings.
2. The fuel mixture, controlled by electronic computers and of course,
fuel injection....eliminates any disparity in the mixture. You will never have
a too lean, or a too rich mixture in an auto engine. The computer will assure
that all is well with the mixture, as well as the ignition timing of the engine.
Our aero-model engines have a certain limitation that one must consider. We
have only only ring on our pistons to do the whole job. In the case of the
ringed two cycle engine, the ring must seal properly, and at the same time
have a minimal ring gap to insure adequate compression and the complete
"pumping action" of the two cycle engine.
The four cycle engine has only one ring as well. Here is where the problem lies.
We must have proper ring seal to insure proper compression....but at the same
time, we must have just enough blow-by to lubricate the rest of the engine.
If....and the big word here is "if" the operator fails to seal the ring on his two
or four cycle aero-model engine....due to improper procedures....he can and
will experience a lot of trouble, and he just might have an engine that turns
out to be unmanageable, or as some say....a POS.
I'm not saying this will happen in every instance, nor am I saying the engine
cannot be brought back to a serviceable condition by changing the operation
....and effecting the remainder of the break-in....to where the ring actually seats.
Some Old Time mechanics will nod when I mention the "Bon Ami" procedure,
in which powdered cleanser was dumped into the carb of an engine running
wide open in an attempt to seat the rings of an engine that had been improperly
broken-in, and suffered from excessive oil consumption and poor performance.
FBD.
