The VTEC valvetrain optimizes cylinder filling efficiency across the engine's entire operating range. 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 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. Active Noise Control (see Interior section).I-VTEC 3.5-Liter V-6 Engine with Variable Cylinder Management (VCM) Highlights New Drive-by-Wire Throttle Control System.SOHC VTEC 3.5-Liter V-6 Engine Highlights Odyssey Powertrain Versus the Competition. Federal Tier 2 Bin 5 emissions, LEV2 ULEV California emissions.Compact engine design with the exhaust manifold integrated into the cylinder head.Active Control Engine Mounts and Active Noise Control on the i-VTEC engine minimizes engine vibrations.Variable Cylinder Management (VCM) system on i-VTEC engine for high fuel economy.Available 255-horsepower SOHC i-VTEC V-6 with 250 lb.-ft.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. 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. A high-level of emission control performance is also aided with a third catalytic converter positioned downstream from the two high-density catalytic converters. High-density catalytic converters are placed directly below the engine's cylinder heads in both banks, boosting performance during cold startups. 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. 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. When full power is needed during acceleration and other situations, the engine operates on all six cylinders. 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. 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. Additional aids to efficiency include a low-restriction intake and exhaust systems, a 10.0:1 compression ratio, and roller-type rocker arms. The VTEC valvetrain and on LX and EX models optimize cylinder filling efficiency across the engine's entire operating range. Two engine configurations are available - one with a VTEC valvetrain and one with an i-VTEC valvetrain that includes cylinder deactivation. 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. 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. 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 Odyssey powertrain uses the latest innovations to achieve the highest levels of performance, fuel economy and low emissions in the minivan segment.
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