a . Cylinder Inner-wall In the stroke range of piston rings, it keep confining the hardness of the liner within narrow limits to strengthen the endurance and to avoid irregular wear, while others fluctuate in wide range of hardness. b. Cylinder Head Homogeneous Casting Structure and few cavities but to a special mothod for more cooling Effect and durability, while others are made by means of general casting method it may cause several defects. c. Cylinder Barrel Theoriginal right-angled edge of each cooling disk of the barrel's modified...