Very cold weather engine break in?

[rdrcrmatt]

I added a TCW butterfly last winter, without we were gettingoil temps at most of 145. Now that we have it I can get 200 easily when it is 5F out.

We will see how it goes when it is -5F to -10F.

Thanks!

[rdrcrmatt]

Well, at 0F it ended up running just fine. But, without the cowling on the oil temp went from 75F startup, to 78F after 5 mins running. Had it on the pan heater for 24 hours prior, and dropped 20 degrees in the 10 minutes it took before I could get it started.

Everything seemed fine but I decided to not run higher than 1500RPM with the oil temp that low. I figure adding the cowling will help. I stopped when the first CHT hit 300F.

I'm thinking I'll run it again tomorrow for further leak checking, then cowl it and plan to fly it Thursday morning.

[Kalibr]

From the Superior engine overhaul manual, break-in section:

?Caution: break-in of an engine in frigid conditions can lead to cylinder glazing and failed break-in due to low oil temprature. It is recommended that oil temprature be maintained between 180 and 190 degrees F?

I personally don?t yet understand why that would be the case.