New Lycoming cylinder

On Aug 31, 2:49 pm, "Dan Luke" wrote:
"Jim Burns" wrote:
A new nitride cylinder will break in fast. Keep your power high, don't baby
it.

Right.

And keep it cool so it won't glaze. Full rich or close to it, cowl flaps wide
open.

Actually my concern is not getting it hot. My engine CHT's run about
290-300F in the winter and 360-380 in the summer in cruise. I'm afraid
that won't be enough to get a good seating.

If I remember, you're non-turbo'd, right? Fly below 6000ft density alt and
you should be able to develop 65-75% power at full throttle, high RPMs, and
a nearly full rich mixture. This should seat the rings just fine. It's the
pressure in the cylinder forcing the rings outward that seats them. Keep
the head cool so your new valve seats don't wander.
Jim

"Robert M. Gary" wrote in message
oups.com...
On Aug 31, 2:49 pm, "Dan Luke" wrote:
"Jim Burns" wrote:
A new nitride cylinder will break in fast. Keep your power high, don't
baby
it.

Right.

And keep it cool so it won't glaze. Full rich or close to it, cowl
flaps wide
open.

Actually my concern is not getting it hot. My engine CHT's run about
290-300F in the winter and 360-380 in the summer in cruise. I'm afraid
that won't be enough to get a good seating.

"Robert M. Gary" wrote:

And keep it cool so it won't glaze. Full rich or close to it, cowl flaps
wide
open.

Actually my concern is not getting it hot. My engine CHT's run about
290-300F in the winter and 360-380 in the summer in cruise. I'm afraid
that won't be enough to get a good seating.

Heat is NOT what seats the rings. Simple wear does it.

Keep your new cyl. cool or it'll glaze and you'll have to have it re-hatched.

--
Dan
T-182T at BFM

"Dan Luke" wrote

Heat is NOT what seats the rings. Simple wear does it.

Keep your new cyl. cool or it'll glaze and you'll have to have it
re-hatched.

But what I read says pressure is what does it, and letting the engine get
too cool is very bad, too.
--
Jim in NC

"Morgans" wrote:


Heat is NOT what seats the rings. Simple wear does it.

Keep your new cyl. cool or it'll glaze and you'll have to have it
re-hatched.

But what I read says pressure is what does it, and letting the engine get
too cool is very bad, too.

Yes, high pressure is required to force the rings against the cylinder walls.
That is why break-in is done at high power.

I've never read that too cool is a problem; I've read in several places that
too hot will glaze the cylinders.

--
Dan
T-182T at BFM