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GM's cam engines among the best
Two of General Motors newest, high-performance overhead cam engines - the 2.0 litre Ecotec Supercharged and 2.8 Litre V6 Turbo - have been named among the industry's 10 best engines of 2006 by the editors at Ward's Communications.
Both engines are variants from two of GM's most popular, global, modular engine families, designed, engineered, and produced around the world. They also share a similar attribute, which Ward's noted as an important development occuring in the industry today: forced induction.
"Turbocharging and supercharging allow us to develop big-displacement-like engine performance, while maintaining the efficiency benefits from a small displacement engine," said Sam Winegarden, GM Powertrain executive director of engine engineering.
The Ecotec 2.0L supercharged is a variant of GM's global Ecotec family, which features an aluminium block, inline four-cylinder, dual overhead cam, four-valve-per-cylinder engine design. At the heart of the Ecotec supercharged is an Eaton M62 helical roots-type supercharger. Maximum supercharger boost pressure is 12 pounds, and the system includes an air-to-water intercooler to increase intake-charge density, which in turn enhances power and reduces a supercharged engine's propensity to "knock" at high boost levels.
The 2.8 V6 Turbo is the newest addition to GM's contemporary global V6 engine family. All engines in the global V6 family share traits that include a 60-degree lightweight aluminium cylinder block with iron cylinder sleeves, an aluminium structural oil pan and aluminium cylinder heads, dual overhead camshafts and four valves per cylinder. The 2.8L V6 Turbo builds on those strengths with components and technology developed with Saab specifically for the turbo system, variable valve timing, and a variable fuel pressure system to ensure smooth idle and driving characteristics.
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01-18-2006, 03:50 AM
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