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Reciprocating internal combustion engine
Mitsubishi Orion engine
Overview
Manufacturer
Mitsubishi Motors
Also called
4G1
Production
1977–present
Layout
Configuration
Straight-4
Displacement
1.2–1.6 L (1,244–1,584 cc)
Cylinder bore
68.2 mm (2.69 in) 69.5 mm (2.74 in) 71 mm (2.8 in) 72.2 mm (2.84 in) 74 mm (2.91 in) 75.5 mm (2.97 in) 76 mm (2.99 in)
Piston stroke
82 mm (3.23 in) 87.3 mm (3.44 in)
Cylinder block material
Cast iron
Valvetrain
OHV 2 valves x cyl. SOHC 2 or 3 valves x cyl. DOHC 4 valves x cyl. with MIVEC or without
Compression ratio
9.4:1
Combustion
Turbocharger
TC06 (on 4G12T only)
Fuel system
Carburetor Multi-port fuel injection Direct injection
Fuel type
Gasoline
Cooling system
Water-cooled
Output
Power output
73–197 hp (54–147 kW)
Torque output
10.9–15.3 kg⋅m (107–150 N⋅m; 79–111 lb⋅ft)
Chronology
Predecessor
Neptune engine
The Mitsubishi Orion or 4G1 engine is a series of inline-four internal combustion engines introduced by Mitsubishi Motors in around 1977, along with the Astron, Sirius, and Saturn. It was first introduced in the Colt and Colt-derived models in 1978. Displacement ranges from 1.2 to 1.6 L (1,244 to 1,584 cc).
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