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This two-cylinder two-stroke "Pivotal" engine gets its name from its pivoting pistons. A picture is said to be worth a thousand words so, rather than trying to describe the novel mechanical design of this engine, I'll just direct you to the Pivotal Engineering web site where you will find pictures, brochures, and a couple of animations. The engines are still in the development stage. Pivotal Engineering, Ltd. is based in Christchurch, New Zealand.