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Originally Posted by -FROG-
Break it in, like you want it to run. If you want a slow car, then baby it. Some moron cam up with the "easy on the break in period" theory....
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Thanks for calling me a moron. Now for all you experts how many have torn down engines that do WOT testing right after assembly? Once you do you will not follow that advice. That fast break-in means hot temps for the rings and piston skirts. That leads to scuffing the bores. OEMS test for that exact condition. But the resulting engine parts are not in very good shape.
Also note that studies like you may read on the internet are fairly old and were done with high peak honing. Most modern engines are plateau honed, which means the bore walls are already very close to a worn in surface when they are made. No big surface peaks to wear off. Piston clearances are getting tighter and tighter, ring tension getting lower and lower. All directionally wrong for running WOT right out of the box.
The most harmful aspect for bore/piston break-in is too much heat. Heat is the byproduct of piston speed and cylinder pressure. So high speed and high load should be avoided during break in. Also avoid light load and high speed as that may result in ring flutter, which could lead to poor wear characteristics.
Course you could completely ignore me as a moron with only 23 years in engine design and development engineering.