![]() The engine design has always been on the same platform with only improvements to the integrity of the design as power increased and fuel injection changes as emissions reductions became greater.The modern diesel engine is a highly complex system of components that work in unison to create the efficient power that drives our industries. With more than 10 years of engine operation, the Duramax is a proven player in the mid-size diesel world. This, along with the higher injection pressure, further increases engine efficiency. Piezo injectors incorporate piezo crystals that are used to create movement of the injector’s pintle, which is faster than the traditional electromagnet. Also, the fuel injection has changed to accommodate the use of piezo injectors and injection pressures reaching 29,000 psi. Urea is injected downstream of the turbo, which becomes a catalyst for NOx gas. Urea injection is an exhaust after treatment, which further reduces emissions. The LML incorporates the use of urea injection. ![]() Horsepower has been increased to 397 along with torque to 765 ft.-lbs. This was an effective way to rid soot from the tailpipe, but causes more fuel consumption.įor 2011 to the present, the (fifth) generation of the Duramax is currently RPO code LML. The fuel ignites in the exhaust system, which burns away the soot from the filter in the DPF. When the DPF becomes clogged with soot, the ECU will actuate the injectors on the exhaust stroke, which will dump raw fuel into the DPF. The DPF is monitored by the engine’s ECU by the use of pressure sensors located in the exhaust system. ![]() The DPF is a device that is located behind the catalytic converter that traps soot coming from the engine. In 1996, the two automakers started working on a new mid-size diesel engine, and after two years of design, the Duramax was formed production began in 2000. Since 1976, GM and Isuzu have worked together as a joint venture on several projects. But by 1999, GM didn’t even offer a diesel option in any of its mid-size trucks. They weren’t interested in making power, just dependability.īy the mid-1990s, GM was definitely behind in both areas and had to find a way to compete in a growing diesel market. GM’s goal at that time of the fuel crunch was to introduce an engine with great reliability and good fuel mileage. ![]() GM never really had a strong reputation for diesel design anyway.Īll we remember is the GM diesel engines were a clacking bucket of bolts that were plagued by many issues from the start of the late 1970s. ![]() The 6.2L and 6.5L engines had been around for sometime, but they were no match for the release of the Cummins 6BT in the Dodge truck in 1989 and the Ford Powerstroke in 1994. Back in the 1990s, GM wasn’t making too many waves in the diesel truck market. ![]()
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