Isuzu 6H engine explained

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

6HK1/Duramax LG4

• Displacement: 7790cc
• Bore and stroke: NaN2NaN2
• 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 300hp)
• Injection: high-pressure common-rail direct injection
• Power/torque: NaNhp, NaNlbft^[1]

6HH1

• Displacement: 8226cc
• Bore and stroke: NaNmm
• 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: NaNhp, NaNabbr=onNaNabbr=on

6HE1

• Displacement: 7127cc
• Bore and stroke: NaNmm
• Aspiration: Naturally aspirated or turbocharged
• Valvetrain: Direct injection, SOHC 24-valve
• Compression ratio: 16.9:1
• Injection: Direct injection
• Power/torque: NaNhp, NaNabbr=onNaNabbr=on

Engine Variants

Notes

6HE1-N	7127cc	175PS
6HE1-S		195PS
6HE1-TCN		220PS
6HE1-TCS		250PS
6HH1-N	8226cc	175PS
6HH1-C		185PS
6HH1-S		210PS
6HL1-N	7166cc	180PS
6HL1-S		205PS
6HK1-TCR	7790cc	205PS
6HK1-TCN		240PS
6HK1-TCC		260PS
6HK1-TCS		280PS
6HK1-TCH		300PS
Duramax LG4 7800		275PS	used in GMC medium-duty trucks

Vehicles

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

Notes and References

1. Web site: 6H Diesel Specifications: 2007 EPA Compliant. August 10, 2010. August 24, 2010. https://web.archive.org/web/20100824201644/http://www.isuzucv.com/engines/6h_specs.html. dead.