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Keeping the (valve lift) pressure up

by David Zatz on

FCA US has been awarded a patent, based on the work of Peter Nowak, for retaining hydraulic fluid in a variable valve lift system.

In fluid-activated valve lift systems, including (but not only) MultiAir, the fluid pressure tends to dissipate after the engine is shut off, causing a delay in operation when the driver restarts. This patent is designed to keep the pressure up, even with the engine up for a long period of time.

The patent drawings show a four-cylinder engine head with four valves per cylinder.  Via Steven St. Laurent

David Zatz founded Allpar in 1998 (based on a site he had begun in 1993-94), after years of writing reviews for retail trades. He has been quoted by the New York Times, the Daily Telegraph, the Detroit News, and USA Today. Before making Allpar a full-time career, he was a consultant in organizational psychology. You can reach him by using our contact form (much preferred) or by calling (313) 766-2304

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