The 3.0-l Duramax Diesel Engine from General Motors
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The 3.0-l Duramax Diesel Engine from General Motors The Duramax 3.0-l six-cylinder in-line diesel engine has been designed from scratch and specifically developed for the new General Motors Full-size Truck platform. It will equip the next generation of Chevrolet Silverado and GMC Sierra as well other vehicles in the future. In order to ensure the best possible in-vehicle integration of the propulsion system in the new platform, a modern all-aluminum diesel engine architecture has been selected, breaking through the paradigm of V engines for pickups by adopting the in-line configuration which is challenging to package but essential to get the highest fuel economy combined with excellent NVH.
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A U T H OR S
Gianmarco Boretto is Director Diesel Engine Hardware Engineering of the Punch Torino S.p.A. in Torino (Italy).
In 2018, the penetration of diesel engines in the North American region (USA, Canada and Mexico) has been roughly 4 % of the overall light-duty market, which includes passenger cars, light- and medium-duty pickup trucks and SUVs, as well as light commercial vehicles. While 4 % is a relatively low share, especially by European standards (around 35 %), given the magnitude of the overall North American region the actual number of diesel vehicles sold was about 700,000, representing a cong
Vincenzo Verdino is Global Chief Engineer of the Punch Torino S.p.A. in Torino (Italy).
Alberto Vassallo is Technical Specialist of the Punch Torino S.p.A. in Torino (Italy).
siderable opportunity. This is one of the main considerations behind the strategic decision taken by General Motors (GM) back in 2014 to develop and bring to market a new in-line sixcylinder (L6) diesel engine specifically conceived and designed for light pick-up trucks and large SUVs. The article describes how the engine has been developed to meet the high expectations of North American pick-up customers, including rated power performance and towing capacity as well noise
Dr.-Ing. Markus Umierski is Vice President of the Project Management Office of the FEV Europe GmbH in Aachen (Germany).
refinement, tougher emissions standards combined with excellent fuel economy. The key technical features of the base engine thermodynamics and mechanical sub-systems, boosting and EGR, controls, and emission reduction technology are also discussed. TARGETS, ENGINE ARCHITECTURE AND TECHNICAL DATA
The choice of the configuration was one of the first milestones in development.
++ Excellent + Good
Architectural selection matrix
– Satisfactory –– Poor
Attribute
Package
Factors
L6
V angle
–
60°
90°
Length
–
+
++
Width
+
–
––
Height
–
–
+
Assuming L6 inclined
+
+
–
90° worse due to the required balancer
++
+
–
V6 timing drive and balancer
Cooling system pressure drop
+
–
–
L6 with cross-flow for minimum Δp
Warm up
+
–
–
V6: mass and external surface area
Intake and exhaust pressure drop
+
–
–
Potentially worse with outboard intake due to duct lenghts
++
+
+
V6 potentia
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