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Originally Posted by lukemillar
Have to say, I'm finding this pretty interesting.
Where is Embee?? I don't have an opinion as yet, but would really like to here what he has to say on this.
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This topic comes up regularly but people come and go on the forum so there's always scope for repeating it.
Go to "search" and type in "break-in" in search-words and "embee" in author for a few examples of previous discussions.
The engine industry still uses the concept of a break-in period, even if it isn't specified as such. It comes from fundamental aspects of manufacturing components and reaching ideal running conditions. It doesn't happen all in the first hour, and if you are looking to make and engine which will last 100k miles with good oil consumption, you can't expect it to fully break-in in a few miles.
Funnily enough today I was going through some work I did a few years ago with a European car manufacturer who was experiencing some piston scuffing failures, and there were extracts from an article by a major piston manufacturer describing the reduction in ring and groove temperatures throughout the break-in period, typically 15deg C (mean values) lower at a given running condition after a full break-in than at the start. Peak instantaneous temps will vary more than that. That can mean the difference between the oil film holding up and not.
It's a bit like baking a cake, 30mins at gas mark3 will work, 10mins at gas mark7 won't.