{{Infobox automobile engine | name = Isuzu 6H Engine | image = File:Isuzu 6HK1 TCN.jpg | caption = Isuzu 6HK1-TCN | manufacturer = [[Isuzu]] and [[General Motors]] | configuration = [[Straight-six engine|Inline six-cylinder]] | fueltype = [[Diesel engine|Diesel]] | fuelsystem = [[Injection pump]] (for 6HH1) [[Common rail|High-pressure common-rail]] [[fuel injection#Direct injection systems|direct injection]] | coolingsystem = [[Radiator (engine cooling)|Water-cooled]] | valvetrain = [[SOHC]] [[Multi-valve#Four valves|4 valves × cyl.]] | compression = 17.5:1, 17.0:1 for {{convert|300|hp|0|abbr=on}} | block = [[Cast iron]] | head = [[Cast iron]] | displacement = {{convert|7127-8226|cc|L cuin|1|order=flip|abbr=on}} | bore = {{convert|115|mm|in|2|abbr=on}} | stroke = {{convert|125|mm|in|2|abbr=on}} | power = {{convert|165-300|PS|0|abbr=on}} | torque = {{convert|520-860|lbft|Nm|0|abbr=on}} | turbocharger = With [[intercooler]] }} The '''Isuzu 6H''' is a family of [[straight-six engine|inline six-cylinder]] [[Diesel engine|diesel engines]] installed in Isuzu [[Medium-duty truck|medium-duty trucks]], and also installed in GM medium-duty trucks as the '''[[Duramax V8 engine|Duramax]] LG4'''. It is mated to the [[Allison Transmission|Allison]] 2500, 3000, and 3500 series transmissions.
==Engine specifications==
'''6HK1/Duramax LG4''' * Displacement: {{convert|7790|cc|L cuin|1|order=flip|abbr=on}} * Bore and stroke: {{convert|115x125|mm|in|2|abbr=on}} * 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 {{convert|300|hp|0|abbr=on}}) * Injection: [[Common rail|high-pressure common-rail]] [[fuel injection#Direct injection systems|direct injection]] *Power/torque: {{convert|200-300|hp|PS kW|abbr=on}}, {{convert|520-860|lbft|kg.m|0|abbr=on|order=}}<ref>{{cite web|url=http://www.isuzucv.com/engines/6h_specs.html|title=6H Diesel Specifications: 2007 EPA Compliant|accessdate=August 10, 2010|archive-date=August 24, 2010|archive-url=https://web.archive.org/web/20100824201644/http://www.isuzucv.com/engines/6h_specs.html|url-status=dead}}</ref>
'''6HH1''' [[File:Isuzu 6HH1-S engine.jpg|thumb|Isuzu 6HH1-S]]
* Displacement: {{convert|8226|cc|L cuin|1|order=flip|abbr=on}} * Bore and stroke: {{convert| 115x132|mm|in|abbr=on}} * 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: {{convert|173-200|hp|PS kW|abbr=on}}, {{convert|47-51|kg.m|lbft|abbr=on|order=flip}}
'''6HE1'''
* Displacement: {{convert|7127|cc|L cuin|1|order=flip|abbr=on}} * Bore and stroke: {{convert|110x125|mm|in|abbr=on}} * Aspiration: naturally aspirated or turbocharged * Valvetrain: direct injection, SOHC 24-valve * Compression ratio: 16.9:1 * Injection: direct injection * Power/torque: {{convert|165-260|hp|PS kW|abbr=on}}, {{convert|46-77|kg.m|lbft|abbr=on|order=flip}}
==Engine variants==
{|class="wikitable sortable" style="font-size:100%;text-align:center;" |+ ! Model !! Displacement !! Output !! class="unsortable" | Notes |- !6HE1-N | rowspan=4 | {{convert|7127|cc|L cuin|1|order=flip|abbr=on}}||{{convert|175|PS|0|abbr=on}} | style="text-align:left;" | |- !6HE1-S |{{convert|195|PS|0|abbr=on}} | style="text-align:left;" | |- !6HE1-TCN |{{convert|220|PS|0|abbr=on}} | style="text-align:left;" | |- !6HE1-TCS |{{convert|250|PS|0|abbr=on}} | style="text-align:left;" | |- !6HH1-N | rowspan=3 | {{convert|8226|cc|L cuin|1|order=flip|abbr=on}}||{{convert|175|PS|0|abbr=on}} | style="text-align:left;" | |- !6HH1-C |{{convert|185|PS|0|abbr=on}} | style="text-align:left;" | |- !6HH1-S |{{convert|210|PS|0|abbr=on}} | style="text-align:left;" | |- !6HL1-N | rowspan=2 | {{convert|7166|cc|L cuin|1|order=flip|abbr=on}}||{{convert|180|PS|0|abbr=on}} | style="text-align:left;" | |- !6HL1-S |{{convert|205|PS|0|abbr=on}} | style="text-align:left;" | |- !6HK1-TCR | rowspan=6 | {{convert|7790|cc|L cuin|1|order=flip|abbr=on}}||{{convert|205|PS|0|abbr=on}} | style="text-align:left;" | |- !6HK1-TCN |{{convert|240|PS|0|abbr=on}} | style="text-align:left;" | |- !6HK1-TCC |{{convert|260|PS|0|abbr=on}} | style="text-align:left;" | |- !6HK1-TCS |{{convert|280|PS|0|abbr=on}} | style="text-align:left;" | |- !6HK1-TCH |{{convert|300|PS|0|abbr=on}} | style="text-align:left;" | |- !Duramax LG4 7800 |{{convert|275|PS|0|abbr=on}} | style="text-align:left;" |used in [[GMC (automobile)|GMC]] [[medium-duty truck]]s |}
==Vehicles== * [[Isuzu F-Series]] * [[Isuzu F-Series|Chevrolet T-Series]] * [[Isuzu H-Series]]
== References == {{reflist}} {{DEFAULTSORT:Isuzu 6H engine}}
[[Category:Diesel engines by model]] [[Category:Isuzu engines|6H]] [[Category:General Motors engines]] [[Category:Straight-six engines]] [[Category:1990s automobile engines]]