Something All In Automotive

       Most engine have two holes,or ports in the enclosed upper end of cylinder.One of the two ports is the intake port.It allows the mixture of gasoline vapour and air to enter the cylinder.The other is the exhaust from,or leave the cylinder.
       These two parts are open only part of the time.The rest of the time they are closed off by the intake and exhaust valves.The valves are metal plugs that fit the round holes or ports.When a valve moves up into its ports,it seals off its port is open.The valves are operated by several engine parts that make up the vale train.The valve train causes the valves to open and close.