Transportation & Fuel Source Technology
Cadillac to Debut GM's Powerful New V-6 Clean Diesel
General Motors unveiled a new 2,9-liter V-6 turbo-diesel
engine that features state-of-the-art injection and combustion
technology for minimum emissions and maximum performance.
The new engine (184 kW/250 hp) will be mainly sold in Europe and
makes its debut at the Geneva Motor Show (March 8-18). Its first
production application is scheduled for 2009 in the new Cadillac CTS.
"We expect the V-6 diesel to be highly competitive in the European
luxury segment," said Jim Taylor, Cadillac General Manager. "With its
excellent low-end torque and its high power output, it is a great fit
with Cadillac's performance-oriented brand character."
The compact dual overhead cam, four-valve V-6 engine belongs to a
new GM family of diesel engines, featuring an innovative closed-loop
combustion control system designed to meet future emissions
standards. The engine can be installed in a longitudinal or
transverse layout and can be adapted to a wide range of two- or
four-wheel drive vehicles.
GM's development of the new engine is being coordinated under the
leadership of GM Powertrain's European operations in Turin, Italy, in
cooperation with VM Motori based in Cento, Italy. GM Powertrain will
focus on the development of the clean combustion process, electronic
engine control and exhaust-gas after treatment, as well as
calibration and integration into GM vehicles. VM Motori will build
the new unit at its plant in Cento, Italy, and is responsible for the
mechanical aspects of the engine's design, development and bench
"The V-6 diesel integrates leading technologies and will deliver
outstanding performance, fuel economy and low emissions," said Roger
Johansson, GM Powertain Europe vice president.
The V-6 engine management system enables optimal fuel economy as
well as reduced emissions and noise by using a recently developed
combustion control technology. Key enablers for the system are high
speed piezo-resistive cylinder pressure sensors that are integrated
within the engine glow-plugs. These specialized sensors acquire
real-time data from the combustion process, enabling instantaneous
fine-tuning of the fuel injection process. In the future, this clean
combustion control technology will be introduced in other GM
Powertrain diesel engines.
The high-pressure, common-rail system provides up to 2000 bar
(29,000 psi) injection pressure. The injectors are quick-firing
piezo-electrically actuated, allowing up to eight injections per
engine cycle. The after-treatment system includes an oxidation
catalyst and a particulate filter that are close coupled to the
engine to achieve future emissions standards.
An electronically controlled variable geometry turbocharger
generates boost pressure. The engine has a torque of 550 Nm (406
lb.-ft.) beginning at 2000 rpm, while providing effective fuel
economy and reduced emissions.
The new, compact V-6 powerhouse features aluminum cylinder heads
and a 60 degree bank angle, 83.0 mm bore and 90.4 mm stroke, which
results in displacement of 2935 cubic centimeters. The engine block
is made of stronger and lighter Compacted Graphite Iron (as compared
to lower strength aluminum or heavier grey cast iron) to optimize
engine packaging, weight, refinement and performance.
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