Colorado and GMC Canyon Inline Engines
General Motors Press ReleasePosted:
the technology of its highly successful Vortec 4200 inline six-cylinder
engine, GM has created two additional inline engines with excellent driveability
features for mid-size pickup customers: the Vortec 3500 inline five-cylinder
and Vortec 2800 inline four-cylinder engines. Both engines will be available
in the 2004 Chevrolet Colorado and GMC Canyon and will provide the power
of a V6 and the efficiency of an I-4.
3500 and Vortec 2800 are, in large measure, scaled down versions of the
award-winning Vortec 4200 six-cylinder engine.
common design, the new inline I-5 and I-4 engines feature the same all-aluminum
construction, dual overhead camshafts and four-valves-per-cylinder technology
as the Vortec 4200. The new engines also share the I-6s high 10:1
compression ratio, electronic throttle control, exhaust cam phasing, coil-on-plug
ignition, direct-mount accessories and easy maintenance features.
aluminum four- and five-cylinder engine blocks and aluminum cylinder heads
are produced using the same "lost foam" casting process as the
Vortec 4200. This process allows more exact dimensional control while
reducing machining efforts in oil galleries, coolant and other internal
the new engines share 75 percent of their components with Vortec 4200
and 89 percent of their components with each other. This provides customers
with highly proven design features and enables GM to develop and introduce
them more quickly and at a lower cost. Commonality also allows the engines
to be manufactured more cost effectively and gives GM a unique ability
to adjust production in response to changing market trends.
3500 I-5 is targeted to produce 215 horsepower and 225 lb-ft of torque.
The Vortec 2800 I-4 is targeted to deliver 170 horsepower and 175 lb-ft
real key to these engines is that theyre part of a carefully planned
and developed inline family," said Ron Kociba, Vortec inline engine
chief engineer. "The Vortec 4200 I-6 was the first and the I-5 and
I-4 take advantage of much of the same technology to provide the same
benefits for pickup truck customers as the I-6 provides in the SUVs."
A major differentiating
feature between the Vortec 3500 and 2800 engines is their dual balance-shaft
system. The balance shafts offset secondary forces inherent to inline
engines and help to provide smooth, quiet operation throughout the entire
into housings on each side of the engine block, the balance shafts rotate
in opposite directions of one another at twice engine speed, countering
secondary forces generated by piston movement. They help eliminate vibrations
that drivers and passengers might otherwise feel transmitted through the
engine mounts to the steering wheel, seats, floor pan or instrument panel.
A rigid block
structure and well-balanced crankshaft are also key to low noise, vibration
and harshness. The Vortec 3500 crankshaft is optimally counterweighted
for its five-cylinder design. Many of the same features used to control
noise and vibration on the I-6 engine are found in the I-4 and I-5, such
as isolated cam covers and acoustic foam treated induction manifolds,
as well as attention to detail in the design process.
manifold-mounted converter a three-way catalyst constructed as
part of the exhaust manifold also sets the I-5 and I-4 engines
apart from the I-6, and enables them to meet foreseeable future emissions
requirements with no change in basic configuration. The new engines are
designed to meet Federal Tier II / California Low Emission Vehicle II
catalytic converters provide optimum initial "light off" (quick,
high temperatures), primarily for oxidizing hydrocarbon and carbon monoxide
emissions, with an under-floor catalyst burning the majority of remaining
exhaust cam phaser is a common feature to the Vortec inline engine family
used to enable variable valve timing (VVT). This technology allows more
freedom in cam profile selection, which enhances power and torque. It
also improves idle smoothness, reduces emissions and improves fuel economy.
VVT is used
to time and regulate the opening and closing of the exhaust valves. The
valve timing is electronically controlled and programmed for optimum emissions,
torque, smooth idle and driveability.
the overlap of the cams, or "retarding the exhaust cam," creates
internal exhaust gas recirculation (EGR) in which gases are evenly distributed
to all cylinders. Leftover gases are simply recycled into the next burn
cycle an enabler for emissions control also providing high output
and smooth idle.
The new engines
use a more powerful, next-generation powertrain control module (PCM),
with a new GM common design. The PCM manages all engine and transmission
functions and communicates with other electronic vehicle controls. The
new PCM provides quicker response time and has flash programmable memory,
allowing quick and easy reprogramming to accomodate new features and updates.
GM is pursuing commonality in its PCMs to reduce engineering time and
cost and to help bring new vehicles to market more quickly.
Vortec 3500 and 2800 key features:
electronic throttle control (ETC) allows precise tailoring of throttle
progression in each of the engines to meet its particular character. ETC
optimizes driveability, fuel economy and emissions control, and enables
other functions, such as cruise control, brake-torque management and traction
control, available on two-wheel-drive models.
integrated into the dual microprocessor PCM, manages the electronic throttle.
Based on information from two independent throttle position sensors and
other data, such as the transmission gear and traction at the wheels,
the PCM directs an electric motor to open the throttle at an appropriate
coil-on-plug ignition system delivers a high-energy spark, which contributes
to clean and consistent combustion, enabling compliance with emissions
and onboard diagnostic misfire requirements. The electronic engine-sensing
and spark control system also contributes to improvements in fuel economy,
high-speed performance and engine efficiency. It has no moving parts,
requires no timing adjustments and eliminates the need for spark plug
follower valvetrain and state-of-the-art PCM also improve engine performance,
efficiency and noise levels.
An "intelligent start" feature prevents drivers from inadvertently
engaging the starter on these smooth, quiet engines when they are already
with both the Vortec 3500 and 2800 engines is the precisely controlled,
smooth shifting Hydra-Matic 4L60-E 4-speed automatic transmission. Used
in all of GMs light-duty applications, it has a long history of
customer-pleasing performance and dependability.
Vortec 3500 and 2800 also link to a standard new high-torque capacity
five-speed manual transmission. Used by GM for the first time, it provides
smoother, higher quality shifts; better launch; improved durability and
a higher degree of fuel efficiency.
From a manufacturing
standpoint, GMs Vortec inline family program provides a unique flexibility
to respond more quickly and in less costly fashion to any future shifts
in engine demand.
can flex four-, five-, and six-cylinder engines a whole lot easier than
you can flex from a V8 to a V6 or even to four-cylinder, which gets pretty
tough," Kociba said.
the Vortec inline family has a high degree of parts commonality, allowing
these components to be machined on the same equipment. The Vortec 3500
will share manufacturing space with the Vortec 2800 in a new facility
at GMs Tonawanda, N.Y., engine plant.
inline engine family also provides a strong foundation from which to add
other potential technologies, such as full variable valve timing (for
both intake and exhaust), turbocharging, direct injection-gasoline or
potentially larger displacements.
term, well continue to investigate new technologies," said
Kociba. "Weve created this engine family to have a long life
and designed an architecture for any of those add-ons, if we determine
a demand for them."