Subaru 2002 Impreza Service Manual page 151

CYLINDER HEAD
9s
Mechanical
7. Cylinder Head
0
The cylinder head is made of aluminium die casting.
0
Each combustion chamber in the cylinder head is a compact, pentroof design. The spark plug
is located at the center of the combustion chamber, which contributes to creation of a wide "squish
area" for increased combustion efficiency.
0
The two intake and two exhaust valves are arranged on opposite sides for a cross-flow feature.
0
The cylinder head gasket is a metallic gasket consisting of three layers of the stainless steel
sheets. It is highly resistant to heat and maintains high level of sealing performance for a long peri-
od.
r-
.
NF0045
(1 ) Intake valve
(2) Intake port
(3) Squish area
(4) Combustion chamber
(5) Exhaust port
(6) Exhaust valve
(7) Spark plug
M E-9