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Isuzu 6H engine

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Isuzu 6H Engine
Overview
ManufacturerIsuzu and General Motors
Layout
ConfigurationInline six-cylinder
Displacement7.1–8.2 L; 434.9–502.0 cu in (7,127–8,226 cc)
Cylinder bore115 mm (4.53 in)
Piston stroke125 mm (4.92 in)
Cylinder block materialCast iron
Cylinder head materialCast iron
ValvetrainSOHC 4 valves × cyl.
Compression ratio17.5:1, 17.0:1 for 300 hp (224 kW)
Combustion
TurbochargerWith intercooler
Fuel systemHigh-pressure common-rail direct injection
Fuel typeDiesel
Cooling systemWater-cooled
Output
Power output165–300 PS (121–221 kW)
Torque output520–860 lb⋅ft (705–1,166 N⋅m)

The Isuzu 6H is a family of inline six-cylinder diesel engines 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

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6HK1/Duramax LG4

  • Displacement: 7.8 L; 475.4 cu in (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))
  • Injection: high-pressure common-rail direct injection
  • Power/torque: 200–300 hp (200–300 PS; 150–220 kW), 520–860 lb⋅ft (72–119 kg⋅m)[1]

6HH1

  • Displacement: 8.2 L; 502.0 cu in (8,226 cc)
  • Bore and stroke: 115 mm × 132 mm (4.5 in × 5.2 in)
  • Aspiration: Naturally aspirated
  • Valvetrain: SOHC 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; 129–149 kW), 340–370 lb⋅ft (47–51 kg⋅m)

6HE1

  • Displacement: 7.1 L; 434.9 cu in (7,127 cc)
  • Bore and stroke: 110 mm × 125 mm (4.3 in × 4.9 in)
  • Aspiration: Naturally aspirated or turbocharged
  • Valvetrain: Direct injection, SOHC 24-valve
  • Compression ratio: 16.9:1
  • Injection: Direct injection
  • Power/torque: 165–260 hp (167–264 PS; 123–194 kW), 330–560 lb⋅ft (46–77 kg⋅m)

Engine Variants

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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

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References

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  1. ^ "6H Diesel Specifications: 2007 EPA Compliant". Archived from the original on August 24, 2010. Retrieved August 10, 2010.