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) 01. General
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W1860BE.book Page 2 Tuesday, January 28, 2003 11:01 PM
GENERAL
MECHANICAL
1. General
The engine used in this vehicle is of a horizontally opposed, four-cylinder design. This four-stroke-
cycle, water-cooled, DOHC turbocharged engine uses a total of 16 valves and its main components
are made of aluminum alloy. It is fueled by a multiple fuel injection system.
The engine's major structural and functional features are as follows:
The cylinder head forms pentroof combustion chambers, each having a spark plug located at its
center and two each of intake and exhaust valves (four valves per cylinder). The intake and exhaust
ports are located in a cross-flow arrangement.
A single timing belt drives four camshafts on the left and right banks and the engine coolant pump
on the left bank. Belt tension is automatically adjusted by a belt tension adjuster, eliminating need
for a manual adjustment.
The crankshaft is supported by five bearings with high rigidity and strength.
The cylinder block is an aluminum casting fitted with cast iron cylinder liners.
(1) (2) (3) (4) (5) (6) (7)
(12) (11) (9) (8)
(10)
ME-00761
(1) Intake camshaft (5) Crankshaft (9) Cylinder Head
(2) Intake valve (6) Connecting rod (10) Oil pan
(3) Piston (7) Spark plug (11) Exhaust valve
(4) Cylinder block (8) Valve rocker cover (12) Exhaust camshaft
ME(STi)-2
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