Dan Gurney Patents New "Moment Cancelling" Engine

Ronnie Schreiber
by Ronnie Schreiber
dan gurney patents new moment cancelling engine

With a resume as accomplished as Dan Gurney has, he would be well within his rights to retire to a life of leisure. The man is 84 years old, after all. However, Gurney stays busy at his All American Racers shop in Santa Ana, California and he recently announced that he’s been granted a United States patent on what he calls the “moment cancelling” engine.

Gurney claims that by using two transversely oriented, counter-rotating crankshafts, the vibrations inherent in reciprocating piston engines will be reduced and reliability and efficiency will be improved, along with what he says will be turbine smoothness.

In its most basic form in a two-cylinder engine, each piston’s connecting rod spins it’s own crankshaft, with the two cranks spinning in opposite directions, cancelling out forces that would normally cause the engine to shake. Gears are used to combine and take power from the two crankshafts. Multiple cylinder engines are also possible, with the odd numbered pistons connected to one crankshaft and the even numbered pistons connected to the other.

Gurney says that the engine design has exceeded expectations when simulated in the digital domain and that he expects to have a physical prototype — an 1,800cc vertical twin — running by the end of this year. There’s a website, momentcancelling.com, describing the project, where you can peruse the simulation data and read about Gurney’s enthusiasm for the engine. The patent is and you can read it here. Mr. Gurney says that the new motor would be suitable for most current motorcycle and automotive applications.

Interestingly, Gurney points out how power output was relatively low on the design brief’s priority list. The primary goal of the moment cancelling engine, according to its inventor, is smoothness, simplicity and compactness.

Ronnie Schreiber edits Cars In Depth, a realistic perspective on cars & car culture and the original 3D car site. If you found this post worthwhile, you can get a parallax view at Cars In Depth. If the 3D thing freaks you out, don’t worry, all the photo and video players in use at the site have mono options. Thanks for reading – RJS

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  • 64andahalf 64andahalf on Sep 03, 2015

    Companies like Capstone Turbine are better positioned to capture the generator market. Very smooth, very efficient in their sweet spot, and reasonably accommodating towards different fuel types

    • Shaker Shaker on Sep 04, 2015

      When I worked in a steel mill back in the 70's, I used to have to start a natural-gas fed International Harvester stationary turbine generator once a month for testing - even with the exhaust pipe exiting the building, the noise was ear-splitting once it spun up.

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