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Old 02 Sep 2010, 06:10 am
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Default Odyssey: 2005 Honda Odyssey Powertrain - Part 1

Overview


The Odyssey powertrain uses the latest innovations to achieve the highest levels
of performance, fuel economy and low emissions in the minivan segment. Honda's
long and successful history introducing state-of-the-art engine technology continues
with the introduction of Variable Cylinder Management on select models and numerous
other features for 2005.


The Honda Odyssey's engine is an advanced 3.5-liter SOHC 24-valve 60-degree
V-6 aluminum-block-and-head design that is compact, light and powerful. A wide
variety of technologies have been engineered to provide 255 horsepower, a broad
and flat torque curve, very low emissions, high fuel efficiency, and instantaneous
throttle response.


Two engine configurations are available - one with a VTEC valvetrain
and one with an i-VTEC valvetrain that includes cylinder deactivation. The VTEC
valvetrain and on LX and EX models optimize cylinder filling efficiency across
the engine's entire operating range. Additional aids to efficiency include a
low-restriction intake and exhaust systems, a 10.0:1 compression ratio, and
roller-type rocker arms. New technology includes a drive-by-wire throttle system
and a sophisticated engine management system that can determine when the vehicle
needs an oil change.


On Touring and EX with Leather models, an "intelligent" i-VTEC
valvetrain automatically de-activates three of the six cylinders during cruising
to enhance fuel economy. When full power is needed during acceleration and other
situations, the engine operates on all six cylinders. Uniquely, Odyssey models
with the i-VTEC valvetrain simultaneously provide the highest fuel economy with
the most power and the longest driving range in the minivan segment.


The Odyssey's engine also provides excellent environmental performance, meeting
California's LEV2-ULEV criteria as well as complying with the Federal Tier 2-Bin
5 emission requirements. High-density catalytic converters are placed directly
below the engine's cylinder heads in both banks, boosting performance during
cold startups. A high-level of emission control performance is also aided with
a third catalytic converter positioned downstream from the two high-density
catalytic converters. To further enhance emission performance inside the engine,
high-atomization multi-hole fuel injectors are used along with four air-fuel
sensors that provide highly precise fuel control and help achieve nearly complete
combustion.


The Odyssey's compact 5-speed automatic transmission provides ultra smooth
and efficient operation characteristics with the adoption of a direct control
shift system that works with the drive-by-wire throttle control.


What's New for 2005



  • 255-horsepower (+15 hp) SOHC VTEC V-6 with 250 lb.-ft. torque (+8 lb.-ft.)

  • Available 255-horsepower SOHC i-VTEC V-6 with 250 lb.-ft. torque

  • Variable Cylinder Management (VCM) system on i-VTEC engine for high fuel
    economy

  • Drive-by-Wire Throttle Control System

  • Active Control Engine Mounts and Active Noise Control on the i-VTEC engine
    minimizes engine vibrations

  • Compact engine design with the exhaust manifold integrated into the cylinder
    head

  • Federal Tier 2 Bin 5 emissions, LEV2 ULEV California emissions

  • High-flow capacity exhaust system


Odyssey Powertrain Versus the Competition



















































































.
2005 Honda Odyssey
2004 Honda Odyssey
2004 Toyota Sienna
2005 Chrysler Town & Country
2004 Nissan Quest
Engine and Displacement
3.5L V-6
3.5L V-6
3.3L V-6
3.3L V-6,

3.8L V-6
3.5L V-6
Horsepower
255
240
230
180 / 215(3.8L)
240
Torque (lb-ft)
250
242
242
210 / 245 (3.8L)
242
Fuel Type
Regular

Unleaded
Regular Unleaded
Premium Unleaded
Regular

Unleaded
Premium Unleaded
Variable Cylinder Management
Available
Not Available
Not Available
Not Available
Not Available
Transmission
5AT
5AT
5AT
4AT
4AT, 5AT
EPA Estimated Fuel Economy, City/Highway, mpg
20/28*

(i-VTEC)

19/25*

(VTEC)
18/25
19/27
19/26 (3.3L)

18/25 (3.8L)
19/26 (4AT)

18/25(5AT)
Emissions Rating

CARB/EPA
LEV2 ULEV/

TIER2 BIN5
LEV/

TIER2 BIN9
LEV2 ULEV /

TIER2 BIN5
LEV /

TIER2 BIN9
LEV2 LEV/

TIER2 BIN5
Drive-by-Wire

Throttle Control
Yes
No
Yes
No
Yes

* Based on 2005 EPA mileage estimates. Use for comparison purposes
only. Actual mileage may vary.

Note: All values subject to change.


SOHC VTEC 3.5-Liter V-6 Engine Highlights

(LX and EX models)



  • 255 horsepower @ 5750 rpm (+15 hp)

  • 250 lb.-ft torque @ 5000 rpm (+8 lb.-ft.)

  • New Drive-by-Wire Throttle Control System

  • Uses regular unleaded gas

  • Federal Tier 2 Bin 5 emissions, LEV2 ULEV California emissions

  • Close-coupled catalytic converter

  • High-flow exhaust


i-VTEC 3.5-Liter V-6 Engine with Variable Cylinder Management (VCM)
Highlights


(EX with Leather and Touring models)

Above features plus:



  • 250 lb.-ft torque @ 4500 rpm

  • Variable Cylinder Management

  • Active Control Engine Mount System

  • Active Noise Control (see Interior section)

  • Dual-Stage Intake Manifold


Engine Architecture


The Honda Odyssey's engine is a transverse mounted 3.5-liter, SOHC, 24-valve,
60-degree, V-6, aluminum-block-and-head design that is compact, light and powerful.
A long list of technologies has been engineered to provide 255 horsepower, a
broad and flat torque curve, ultra-low emissions, high fuel efficiency and instantaneous
throttle response. The VTEC valvetrain optimizes cylinder filling efficiency
across the engine's entire operating range.

The i-VTEC engine further extends fuel economy while maintaining the same power
as the regular VTEC engines. Low-restriction intake and exhaust systems, a 10.0:1
compression ratio and roller-type rocker arms also aid efficiency.


Engine Block


The Odyssey's 3.5-liter die-cast engine block is made from heat-treated
aluminum to maximize block rigidity and to minimize weight. A deep-skirt configuration
rigidly supports the crankshaft, minimizing noise and vibration. Thin-wall,
centrifugally-cast iron liners help reduce overall length and weight. Each liner's
rough as-cast exterior surface bonds securely to surrounding aluminum during
the manufacturing process to increase strength and enhance heat transfer.

Lightweight and Compact Construction

The Odyssey engine features lightweight and compact construction through the
use of serpentine belts to drive engine accessories, a lightweight and high-strength
timing belt, and an integrated die-cast aluminum exhaust manifold help make
the engine more compact and lightweight. The compact and lightweight components
contribute to improved packaging and reduced weight for enhanced fuel economy
and performance.


Integrated Exhaust Manifold


The exhaust manifold is integrated and unified with the cylinder head. High-density
catalytic converters have been placed directly under the cylinder heads on each
side, which is a design that vastly reduces combustion-gas heat loss and ensures
quick activation of the catalytic converters for better purification during
cold starts. An additional catalytic converter under the floor cleanses exhaust
gases even further.


Crankshaft/Connecting Rods/Pistons


A forged-steel crankshaft is used for maximum strength, rigidity and durability
with minimum weight. In place of bulkier, heavier nuts and bolts, connecting
rod caps are secured in place with high-tensile-strength fasteners that screw
directly into the connecting rod. Short-skirt, cast-aluminum, flat-top pistons
are notched for valve clearance and fitted with full-floating piston pins.


Cylinder Head Construction


The Odyssey utilizes innovative cylinder heads that include tuned exhaust manifolds
as an integral part of the casting. Made of pressure-cast, low-porosity aluminum,
these lightweight components improve overall packaging, enhance exhaust flow
and permit optimal positioning of the close-coupled catalytic converters.


Unlike many minivans, the Odyssey has four-valve combustion chambers, the best
approach to optimum performance with excellent fuel efficiency and very low
emissions. Valves are clustered near the center of the bore to minimize combustion
chamber volume and to provide ample squish area. A 10.0:1 compression ratio
helps maximize thermal efficiency, power output, and fuel mileage. A fiberglass-reinforced
toothed belt drives one centrally located camshaft per bank. Head gaskets are
made of high-strength materials to contain combustion pressures.


Variable Valve Timing and Lift Electronic Control (VTEC™)


Standard on all models, the Odyssey's innovative Variable Valve Timing
and Lift Electronic Control (VTEC) is one key to maximizing engine output across
the engine's full operating range. The high-rpm induction lobes of the
camshaft provide additional valve lift to help increase peak horsepower. Ordinary
engines have fixed valvetrain parameters - the same timing of valve lift
and overlap whether the tachometer needle is struggling to climb out of the
low-rpm range or screaming at the redline. The VTEC approach, however, has two
distinct modes so that operation of the intake valves changes to optimize both
volumetric efficiency (breathing) and combustion of the fuel-air mixture. In
order to achieve the optimum volumetric efficiency in the lower portion of the
engine's operating range, rocker arms are programmed to follow cam lobes that
provide low lift and reduced duration (shorter time open with less valve lift).


At 4600 rpm, the Odyssey's powertrain control module commands the VTEC system
to switch intake valve operation to the high-rpm mode. In response, an electric
spool valve opens to route pressurized oil to small pistons within the intake-valve
rocker arms. These pistons then slide to lock the three rocker arms provided
for each cylinder together. As a result, both intake valves follow a central
high-lift, longer-duration cam lobe. The switching process takes place instantaneously
and is undetectable by the driver. The extra lift and longer duration provide
the added air and fuel the engine needs to produce high peak horsepower and
a broader torque band. Instead of a peaky engine, the Odyssey has a powerplant
that provides excellent performance at any engine speed.


i-VTEC with Variable Cylinder Management™ (VCM™)


Honda's innovative VTEC technology has evolved once again: the i-VTEC* engine
(the "i" is for intelligent) in the 2005 Odyssey features a Variable
Cylinder Management (VCM) system that switches between six- and three-cylinder
combustion. When high output is required, such as during startup and acceleration
or when climbing hills, the engine operates on all six cylinders to deliver
superior performance. During cruising and at low engine loads, the system idles
one bank of three cylinders, thus achieving outstanding fuel economy. Further,
the idled cylinders remain sealed, alleviating the pumping losses associated
with intake and exhaust and giving fuel economy a further boost.


Variable Cylinder Management helps maximize fuel economy by making the Odyssey's
available i-VTEC V-6 engine effectively run on only three cylinders when the
power needs are minimized, yet it can still seamlessly provide the full power
of all six cylinders during acceleration or other high power situations. When
full power is needed, i-VTEC instantly opens the valves and sends fuel to three
more cylinders with output reaching as much as 255 horsepower. Honda's
VCM system allows for maximum performance and maximum fuel economy - two
characteristics that rarely co-exist at this level of extremes. Other minivans
may offer high fuel economy and others may offer engines tuned for horsepower,
but only the Odyssey delivers class-leading levels of both.


* Of special note, Honda's 4-cylinder i-VTEC technology
uniquely employs VTEC + Variable Timing Control (VTC) for superior performance
and fuel economy. Honda's intelligent V-6 technology uniquely employs
Variable Cylinder Management (VCM) for performance and fuel economy.

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