Isuzu 6H engine

Isuzu 6H Engine
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)
Cylinder block material	Gray iron
Cylinder 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)

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.

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)

6HE1-N 7.1 L; 434.9 cu in (7,127 cc) 165 PS (121 kW)

6HE1-S 7.1 L; 434.9 cu in (7,127 cc) 195 PS (143 kW)

6HE1-TCN 7.1 L; 434.9 cu in (7,127 cc) 220 PS (162 kW)

6HE1-TCS, 7.1 L; 434.9 cu in (7,127 cc) 250 PS (184 kW)

6HH1-N 8.2 L; 502.0 cu in (8,226 cc) 175 PS (129 kW)

6HH1-C 8.2 L; 502.0 cu in (8,226 cc) 185 PS (136 kW)

6HH1-S 8.2 L; 502.0 cu in (8,226 cc) 210 PS (154 kW)

6HL1-N 7.2 L; 437.3 cu in (7,166 cc) 180 PS (132 kW)

6HL1-S 7.2 L; 437.3 cu in (7,166 cc) 205 PS (151 kW)

6HK1-TCR 7.8 L; 475.4 cu in (7,790 cc) 205 PS (151 kW)

6HK1-TCN 7.8 L; 475.4 cu in (7,790 cc) 240 PS (177 kW)

6HK1-TCC 7.8 L; 475.4 cu in (7,790 cc) 260 PS (191 kW)

6HK1-TCS 7.8 L; 475.4 cu in (7,790 cc) 280 PS (206 kW)

6HK1-TCH 7.8 L; 475.4 cu in (7,790 cc) 300 PS (221 kW)

Duramax LG4 7800 7.8 L; 475.4 cu in (7,790 cc) 275 PS (202 kW) (used in GMC medium-duty trucks)