Quote:
Originally Posted by d3sign3r
An ICE is either on and cranking and combusting or it's off. The materials of the rings or rotating assembling don't magically strengthen by going slow or varying the RPMs. ICE does the same exact things at 6k RPM as at 1k. Maybe the cooling systems flow a little faster.
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Absolutely not true. Well, coolant does flow a "little" faster.
New engines have consider friction. This is normal. But can be a problem if the engine is operated at too high of an RPM level or with too much load.
Break in gives time for the various sliding/rotating surfaces to adapt and develop into surfaces which can deliver wear free service from sub-zero cold starts to 160mph+ runs in triple digit temperatures.