Duramax Engine

Duramax is General Motors' diesel engine family for large trucks that was originally designed by Isuzu. The 6.6-liter Duramax is produced by DMAX, which was a joint venture between GM and Isuzu in Moraine, Ohio. However, in 2006, GM sold its entire stake in Isuzu ending the relationship. GM now has no connections with Isuzu. Also in 2006, production at Moraine was reportedly limited to approximately 200,000 engines per year. DMAX announced the production of the 1,000,000th Duramax V-8 Diesel Engine at its Moraine facility.

DMAX diesel engines

DMAX of Moraine, Ohio is a manufacturer of Diesel engines for trucks. Originally A joint venture between General Motors and Isuzu Motors, the formation of DMAX was announced in December of 1998. General Motors acquired a majority stake of the venture in 2003, including all engine designs. The company's Duramax V8 engine has been extremely successful for GM. Prior to the founding of the DMAX venture, the Moraine plant produced GM's 6.5 L Diesel V8. Production of that engine began in 1982.

Duramax Engine types

There are 3 engines that comprise Duramax; Circle L, Duramax V6, Duramax V8. The Circle L engine is an automobile engine produced by Isuzu Motors Polska out of Poland. It's a is a 1.7 L Diesel straight-4 originally designed by Isuzu but now owned entirely by General Motors. Honda uses the Circle L engine primarily in Europe by GM’s Opel and Vauxhall subsidiary. The next two engines are the DMAX V6 and DMAX V8.

Duramax V6

The Duramax V6 is a 3L diesel engine. Originally designed and produced by Isuzu in Fujisawa, Kanagawa, Japan but the design rights to the engine are now owned by General Motors. It uses high-pressure common-rail direct injection with a 4-valve cylinder head. A turbocharger and intercooler are also used. The Duramax V6 engine's internal name is 6DE1.The Duramax V6 engine is used in the Saab 9-5, Open/Vauxhall Vectra, Renault Vel Satis and Renault Espace.

Duramax V6 and V8 use Direct Injection

Duramax uses the direct injection because with the diesel engines they are generally more efficient and cleaner than indirect injection engines. Another advantage to the direct injection is that this is becoming the next step in evolution from multi-port fuel injection and offers another level of emission control by eliminating the "wet" portion of the induction system.

Duramax Direct Injection process

The entire process allows for better dispersion and homogeneity of the directly injected fuel, the cylinder and piston are cooled, thereby permitting higher compression ratios and more aggressive ignition timing, with resultant enhanced output. More precise management of the fuel injection event also enables better control of emissions. Finally, the homogeneity of the fuel mixture allows for leaner air/fuel ratios, which together with more precise ignition timing can improve fuel economy.

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