While the article below is specifically referencing the Cruze, the Volt's LUU range extender ICE benefits from the very same oil pump configuration. A lot of people are under the assumption that the Family 0 Ecotec engine has very little newer technology in its design, but that's just not true. With other fuel efficient and emissions friendly technologies such as low friction piston rings, low mass valvetrain, electrically managed thermostat, dual-mode (intake AND exhaust thus atkinson capable) VVT, close-coupled catalytic converter with fast "light-off" heated oxygen sensors, its as good as it gets in a modern 4-cyl.
There's also a video available showing this pump available on this GMCL web page.General Motors of Canada on Aug 25 2010 said:Special Oil Pump Helps Chevrolet Cruze Conserve Fuel
Variable Displacement Pump Delivers Precise Amount of Oil in all Driving Conditions
The oil pump in the engine of the 2011 Chevrolet Cruze takes a laid-back approach to its work, delivering the precise amount of oil needed during all driving conditions. That requires the engine to work less versus a conventional pump and ultimately saves fuel.
A standard feature in the Cruze’s Ecotec 1.4L turbocharged engine, the variable displacement oil pump reduces the displacement during engine warm up and high speed conditions. The volume of oil from the pump varies with rpm by changing the pump’s displacement through a pivoting control chamber mechanism and sliding vanes. A fixed displacement pump would typically bypass the extra oil internally.
“By lowering the volume of oil we reduce the amount of energy, or torque, required to pump the oil, without taking necessary lubrication away from the engine,” said Mike Katerberg, assistant chief engineer for the 1.4L. “Reducing the torque demand reduces fuel consumption. It’s a simple, durable, maintenance-free design that we have used in our transmissions for years and more recently in our hybrid vehicles.”
The Ecotec 1.4L turbo is standard on Eco, LT Turbo and LTZ Turbo models and helps the Cruze Eco, with a standard six-speed manual transmission, achieve segment best highway fuel consumption - as low as 5.0 L/100km.*
The benefits of the variable displacement oil pump increase when used with other technologies such as variable valve timing which operate using oil pressure. Variable valve timing adjusts the engine valves' opening and closing timing for optimal performance, fuel efficiency and emissions across the rpm band – including greater low-rpm torque.
The all-new 2011 Chevrolet Cruze will begin arriving in Canadian dealerships in October starting at $14,995, plus DFC. Built to win in the in the compact-car segment, the Cruze offers more interior room, more standard safety features, and a better powertrain warranty than Civic, Corolla and Focus.
* Based on GMCL preliminary testing in accordance with approved Transport Canada test methods.
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