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Siemandero. Today such an interesting fact, namely a good and a bad engine. Sorry for the nomenclature, I am only a primitive mechanic and sometimes I am not sure whether I am talking about static or boundary friction because taking into account the sliding layer on the bearing, it can be called boundary friction, but some sources say that it is static friction. Forged connecting rods have a wider and rectangular head. I invite you to discuss in the comments. Regards. Workshop furniture that I use. http://www.fastservice.pl