Bruce Nunnally Posted May 25, 2016 Report Share Posted May 25, 2016 A Look inside of a 4-cycle running engine , FIRST the piston travels down the cylinder bore drawing in a fresh fuel/air charge, INTAKE VALVE OPEN. SECOND the piston ascends BodybyFisher 1 Quote Bruce 2016 Cadillac ATS-V gray/black Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
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