Cylinder head combustion chambers are designed to help improve the swirl or turbulence of the air-fuel mixture, and prevent fuel droplets settling on the surfaces of the combustion chamber or cylinder walls. . Diesel Combustion Chambers Direct-injection diesel engines inject into the combustion chamber formed in the top of the piston. For indirect injection, the combustion chamber is a separate chamber formed in the head. . Exhaust Passages Smaller intake and exhaust passages and ports allow more torque at low engine speeds. At high speeds, smaller passages restrict airflow.
Larger passages produce greater power at high engine speeds.
Gaskets Gaskets Gaskets form a seal by being compressed between stationary parts where liquid or gas could pass. Gaskets around a rotating part would quickly wear out. Oil seals are used to seal these parts.