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The Isuzu 6H is a family of inline-6 cylinder Diesel engine installed in Isuzu medium duty trucks, and also installed in GM medium-duty trucks as the Duramax LG4. It is mated to the Allison 2500, 3000 and 3500 Series transmissions.

Isuzu 6H Engine
Overview
Manufacturer	Isuzu and General Motors
Layout
Configuration	Inline-6
Displacement	7.1–8.2 L; 434.9–502.0 cu in (7,127–8,226 cc)
Cylinder bore	115 mm (4.53 in)
Piston stroke	125 mm (4.92 in)
Block material	Gray iron
Head material	Cast iron
Valvetrain	SOHC 4 valves x cyl.
Compression ratio	17.5:1, 17.0:1 for 300 hp (224 kW)
Combustion
Turbocharger	With Intercooler
Fuel system	High-pressure common-rail direct injection
Fuel type	Diesel
Cooling system	Water-cooled
Output
Power output	165–300 PS (121–221 kW)
Torque output	520–860 lb⋅ft (705–1,166 N⋅m)

Engine Specifications

6HK1/Duramax LG4

• Displacement: 7.8 to 7.8 L; 475.1 to 475.4 cu in (7,785 to 7,790 cc)
• Bore and stroke: 115 mm × 125 mm (4.53 in × 4.92 in)
• Block: gray iron
• Cylinder head: cast iron
• Fuel cutoff: 2400 rpm
• Aspiration: Turbocharged and Intercooled
• Valvetrain: SOHC, 24 Valve
• Compression: 17.5:1 (17.0:1 for 300 hp (224 kW) motor)
• Injection: high-pressure common-rail direct injection
• Power / Torque: 200 bhp (149 kW) to 300 bhp (224 kW), 520 lb⋅ft (705 N⋅m) to 860 lb⋅ft (1,166 N⋅m)[1]

6HH1

• Displacement: 8,226 cc (8.226 L; 502.0 cu in)
• Bore and Stroke: 115 mm × 132 mm (4.5 in × 5.2 in)
• Aspiration: Naturally Aspirated
• Valvetrain: OHC 24 valve
• Compression Ratio: 18.5:1
• Injection: Reformed Bosch, Inline Injection Pump with Automatic Timer and All-Speed Mechanical Governor
• Power / Torque: 173–200 hp (175–203 PS) and 47–51 kg⋅m (340–370 lb⋅ft)

6HE1

• Displacement: 7,127 cc (7.127 L; 434.9 cu in)
• Bore and Stroke:110 mm × 125 mm (4.3 in × 4.9 in)
• Aspiration: Naturally Aspirated and Turbocharged
• Valvetrain: Direct Injection 24 valve
• Compression Ratio: 16.9:1
• Injection: Direct Injection
• Power / Torque: 165–260 hp (167–264 PS) and 46–77 kg⋅m (450–760 N⋅m; 330–560 lb⋅ft)

Engine Variants

Model	Displacement	Output	Notes
6HE1-N	7.1 L; 434.9 cu in (7,127 cc)	175 PS (129 kW)
6HE1-S		195 PS (143 kW)
6HE1-TCN		220 PS (162 kW)
6HE1-TCS		250 PS (184 kW)
6HH1-N	8.2 L; 502.0 cu in (8,226 cc)	175 PS (129 kW)
6HH1-C		185 PS (136 kW)
6HH1-S		210 PS (154 kW)
6HL1-N	7.2 L; 437.3 cu in (7,166 cc)	180 PS (132 kW)
6HL1-S		205 PS (151 kW)
6HK1-TCR	7.8 L; 475.4 cu in (7,790 cc)	205 PS (151 kW)
6HK1-TCN		240 PS (177 kW)
6HK1-TCC		260 PS (191 kW)
6HK1-TCS		280 PS (206 kW)
6HK1-TCH		300 PS (221 kW)
Duramax LG4 7800		275 PS (202 kW)	used in GMC medium-duty trucks

Vehicles

• Isuzu F-Series
• Chevrolet T-Series
• Isuzu H-Series

References

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