The next Joint Light Tactical Vehicle that will replace the US Army’s iconic Humvee will be powered by military grade version of the Duramax 6.6-litre V8 turbo diesel used in GM’s large pickups.
Wisconsin-based Oshkosh Defence LLC won the contract for the new JLTV over Lockheed Martin and AM General, which could see General Motors’ powertrain division deliver up to 55,000 of their Duramax diesel engines.
The actual contract specifies 17,000 of the new tactical vehicles, but the Washington Post reported that the deal could be worth as much as US$50 billion and more than three times the initial allocation of JLTVs.
The 6.6-litre Duramax diesel is jointly developed with Japanese manufacturer Isuzu and has been employed as GM’s workhorse models since 2001, in heavy-duty varieties of the Sierra and Silverado pickup trucks.
The latest edition of this engine develops 296kW and 1036Nm of torque, at least, in civilian guise. Oshkosh hasn’t listed specification requirements for the military-grade version, but has said it will offer improved fuel economy, both at idle and on the run.
Apart from several revamps of the Duramax engine, the twin-turbo 32-valve dual-overhead-cam unit remains largely unchanged since its introduction in 2001.