CYLINDER HEAD [SKYACTIV-D 2.2]
id0110s5000400
Purpose, Function
• The cylinder head forms the combustion chamber and intake and exhaust ports.
Construction
• The lightweight cylinder head is made of aluminum alloy with excellent thermal conductivity.
• There are two intake valves and two exhaust valves per cylinder for a total of four valves and the intake/exhaust type has been changed to a cross-flow type, improving intake and exhaust efficiency.
• With the adoption of plastic region tightening* for the cylinder head bolts, axial force has been stabilized.
• By incorporating an exhaust gas passage in the cylinder head, the exhaust manifold is unnecessary, the engine weight is reduced and a compact layout is realized.
* :Plastic region tightening is a method of controlling the tightening using the rotation angle of a bolt and suppressing the variations in the axial force by tightening the bolt until its deformation does not return to its original condition (plastic region).
