ENGINE PARTS AND ENGINE METAL

All about engine/ first we can discuss about sylinder head so. The sylinder head are made from cast iron or aluminium alloy. But there are build  an combustion chamber inside of sylinder in  the more than  sylinder head.and even  there does insert the rocker arm.valve. air passage exhaust passage valve seet. And there does fitting some as injectors. or sparck plug. And hitter plug (glow plug )that all. But in the midst of all this.the bottom of the sylinder  Does work to  seel the air gasses exhaust  from one side. This work does continue. And as well there comes direct contact with hit. So for colling there are an port of watter jacket coolant in the head.and acording to sylinder head design there can put 4valve. Can see in last article thank you