Break In Part3

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This picture is same type OS engine piston.
But each engines take different way of break in.
Already you can understand.
Left side is running in,right side is stand in. 
Each engine left side is exhaust side.
Thermal expansion lean left side continued long time.
Then piston top scrape right side only. 
And piston side doesn't scrape uniformity.

Stand in disuse piston.
Not break in,only do break.
It takes a balance by chance for short term.

So I said heat cycle is very important.
Heat cycling protect piston to lean thermal.

Perfect break in is like this.
Piston top scraping belt width is uniformity on zoom up shot!
AND piston side luster is uniformity.

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