# Isuzu 6H engine

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Reciprocating internal combustion engine

Isuzu 6H Engine Isuzu 6HK1-TCN Overview Manufacturer Isuzu and General Motors Layout Configuration Inline six-cylinder 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 Cast iron Cylinder head material Cast iron Valvetrain SOHC 4 valves × cyl. Compression ratio 17.5:1, 17.0:1 for 300 hp (224 kW) Combustion Turbocharger With intercooler Fuel system Injection pump (for 6HH1) 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 six-cylinder](/source/Straight-six_engine) [diesel engines](/source/Diesel_engine) installed in Isuzu [medium-duty trucks](/source/Medium-duty_truck), and also installed in GM medium-duty trucks as the **[Duramax](/source/Duramax_V8_engine) LG4**. It is mated to the [Allison](/source/Allison_Transmission) 2500, 3000, and 3500 series transmissions.

## Engine specifications

**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](/source/Turbocharged) and [intercooled](/source/Intercooled)

- Valvetrain: [SOHC](/source/SOHC) 24-valve

- Compression: 17.5:1 (17.0:1 for 300 hp (224 kW))

- Injection: [high-pressure common-rail](/source/Common_rail) [direct injection](/source/Fuel_injection#Direct_injection_systems)

- Power/torque: 200–300 hp (200–300 PS; 150–220 kW), 520–860 lb⋅ft (72–119 kg⋅m)[1]

**6HH1**

Isuzu 6HH1-S

- 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

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](/source/Isuzu_F-Series)

- [Chevrolet T-Series](/source/Isuzu_F-Series)

- [Isuzu H-Series](/source/Isuzu_H-Series)

## References

1. **[^](#cite_ref-1)** ["6H Diesel Specifications: 2007 EPA Compliant"](https://web.archive.org/web/20100824201644/http://www.isuzucv.com/engines/6h_specs.html). Archived from [the original](https://www.isuzucv.com/engines/6h_specs.html) on August 24, 2010. Retrieved August 10, 2010.

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Adapted from the Wikipedia article [Isuzu 6H engine](https://en.wikipedia.org/wiki/Isuzu_6H_engine) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Isuzu_6H_engine?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.