David Koehler wrote:
Greetings All,
First, thank you for all the insight, I've been all over the net, from
Lycoming to Glastar. It seems that the break in is to seat the rings and if
it's not done correctly the cylinder walls will glaze and the rings will
never seat. One can start the engine up for short runs monitoring the
temperature until the "break-in" can be done. We're not talking about 3 or 4
years, just a few runs not to exceed 3 minutes each and turning the engine
off. I believe with smaller engines (rotax) you can tie them to a pole.
Again, Thanks to all, without all the input I would still be going in
circles.
david

Yes, with the rotax 2-strokes, the breakin procedure is normally done
with the airplane tied down. It's a little over an hour, but involves
starting slow and gradually increasing the amount of work the motor
does. Overall, there's only about 5 or 6 minutes of full throttle
operation, most of it right at the end. The motor is essentially ready
to fly at the end of it with the rings just about fully seated. In my
experience, though, about 10 hours is needed to fully break it in and
get stable CHT's.

I'm a strong believer in the tied-to-the-pole breakin procedure since it
not only allows a breakin but also proves the motor installation. If
there's a problem with your mounting job, it'll definitely show up
during that screaming breakin.

Also, if there's a fatal, major defect in the motor that'll show up too
as a siezure or explosion or whatever.

The nice thing is, the the plane tied down, all this will happen on the
ground instead of way up in the air......

That's not a hard and fast rule though, as some manufacturers recommend
the breakin be done in the air.....

LS
N646F

"David Koehler" wrote in message
...

Hi All,
I'm not there yet, but, I have a new Lycoming O-360 and in the process of
building a homebuilt kit. Lycoming says to break in the engine at full

power

and gives procedures on how to do it. The kit needs slow taxi, then fast
taxi, glazing of the brakes. After take off there are procedures to do at
lower power.... I know I'm not the FIRST in this dilemma, so what takes a
preference? If you wait to do the full power to seat the rings, is that

ok?

Thanks for any response, I'm at a loss,
david