Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 25. MECHANICAL (STi) 06. Cylinder Head
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W1860BE.book Page 9 Tuesday, January 28, 2003 11:01 PM
CYLINDER HEAD
MECHANICAL
6. Cylinder Head
The cylinder head is made of aluminum casting.
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.
The two intake and two exhaust valves are arranged on opposite sides for a cross-flow feature.
The cylinder head gasket is a metallic gasket consisting of three layers of the stainless steel
sheets. The gasket is highly resistant to heat and maintains high level of sealing performance for a
long period.
(1)
(2)
(1) (2) (3)
(4)
(7)
(6) (5)
(6)
(5)
ME-00793
(1) Intake valve (hollow type) (5) Exhaust port
(2) Intake port (6) Exhaust valve (sodium-filled)
(3) Squish area (7) Spark plug
(4) Combustion chamber
ME(STi)-9
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