Honda G engine

See also: Straight-five engine

The Honda G-series engine is a family of slanted inline-five cylinder gasoline engines. The engine family features a single overhead cam layout with 4 valves per cylinder. The engine's displacement varied from 2.0 L; 121.8 cu in (1,996 cc) to 2.5 L; 149.6 cu in (2,451 cc). The G-Series was originally used in the 1989 Honda Vigor, Honda Rafaga, Honda Ascot and Honda Inspire before being carried over to the Vigor's successor; the Acura TL, which used the G-Series family of engines from 1995 to 1998 in North America, and continued use in the JDM Honda Saber until 1998 as well.

Honda G engine
Overview
Manufacturer	Honda Motor Manufacturing
Production	1989–1998
Layout
Configuration	Naturally aspirated inline-5
Displacement	2.0–2.5 L; 121.8–149.6 cu in (1,996–2,451 cc)
Cylinder bore	82 mm (3.23 in) 85 mm (3.35 in)
Piston stroke	75.6 mm (2.98 in) 86.4 mm (3.40 in)
Cylinder block material	Aluminum
Cylinder head material	Aluminum
Valvetrain	SOHC 4 valves x cyl.
Compression ratio	9.0:1-10.0:1
RPM range
Max. engine speed	6800
Combustion
Fuel system	Fuel injection
Fuel type	Gasoline
Cooling system	Water-cooled
Output
Power output	114–140 kW (155–190 PS; 153–188 hp)
Torque output	19–24.2 kg⋅m (186–237 N⋅m; 137–175 lb⋅ft)

G20A

• Displacement: 2.0 L; 121.8 cu in (1,996 cc)
• Bore x Stroke: 82 mm × 75.6 mm (3.23 in × 2.98 in)
• Compression ratio: 9.7:1
• Max Power: 114–118 kW (155–160 PS; 153–158 hp) @ 6700 rpm
• Max Torque: 19 kg⋅m (186 N⋅m; 137 lb⋅ft) @ 4000 rpm
• Redline: 6800 rpm
• Fuel Cutoff: 7100 rpm

Found in the 1989-1991 JDM Inspire/Vigor (CB5), 1992-1994 JDM Inspire/Vigor 20 (CC3), 1993-1997 JDM Ascot/Rafaga 2.0 (CE4), and 1995-1997 JDM Inspire/Saber 20 (UA1).

G25A

• Displacement: 2.5 L; 149.6 cu in (2,451 cc)
• Bore x Stroke: 85 mm × 86.4 mm (3.35 in × 3.40 in)
• Compression ratio: 10.0:1
• Max Power: 140 kW (190 PS; 188 hp) @ 6500 rpm
• Max Torque: 24.2 kg⋅m (237 N⋅m; 175 lb⋅ft) @3800 rpm
• Redline: 6800 rpm
• Fuel Cutoff: 7100 rpm

Found in the 1992-1994 JDM Inspire/Vigor 25 (CC2), 1993-1997 Ascot/Rafaga 2.5S (CE5), and 1995-1997 JDM Inspire/Saber 25 (UA2).

G25A1

• Compression ratio: 9.0:1

Found in the 1992-1994 USDM & CDM Acura Vigor (CC2).

G25A4

• Compression ratio: 9.6:1

Power: 176 hp (131 kW; 178 PS)

Found in the 1995-1998 USDM & CDM Acura 2.5TL (UA2).

Gallery

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  Front view
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  Top view
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  Left view
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  Right view

References

• Official Honda Inspire site (Japanese)
• Fact Book G20A (Japanese)