Saturn I4 engine

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Saturn engine
Overview
Manufacturer	Saturn Corporation
Also called	Single Cam Twin Cam
Layout
Configuration	Straight-4
Displacement	1.9 L; 116.0 cu in (1,901 cc)
Cylinder bore	82 mm (3.23 in)
Piston stroke	90 mm (3.54 in)
Cylinder block material	Aluminum
Cylinder head material	Aluminum
Valvetrain	SOHC 2 valves x cyl. DOHC 4 valves x cyl.
Compression ratio	SOHC: 9.3:1 DOHC: 9.5:1
Combustion
Fuel system	Throttle-body fuel injection Sequential MPFI
Fuel type	Gasoline
Oil system	Wet sump
Cooling system	Water-cooled
Output
Power output	LK0: 85 hp (63 kW) L24: 100 hp (75 kW) LL0: 124 hp (92 kW)
Specific power	LK0: 44.7 hp (33.3 kW)/L L24: 52.6 hp (39.2 kW)/L LL0: 65.2 hp (48.6 kW)/L
Torque output	LK0: 107 lb⋅ft (145 N⋅m) L24: 115 lb⋅ft (156 N⋅m) LL0: 122 lb⋅ft (165 N⋅m)
Dimensions
Dry weight	SOHC: 196.74 lb (89.24 kg) DOHC: 220.22 lb (99.89 kg)
Chronology
Successor	Ecotec engine (de facto)

The powerplant used in Saturn S-Series automobiles was a straight-4 aluminum piston engine produced by Saturn, a subsidiary of General Motors. The engine was only used in the Saturn S-series line of vehicles (SL, SC, SW) from 1991 through 2002. It was available in chain-driven SOHC or DOHC variants.

This was an innovative engine for the time using the lost foam casting process for the engine block and cylinder head. Saturn was one of the first to use this casting process in a full-scale high-production environment. Both engine types used the same engine block.