The desmodromic valve engine, widely used by Ducati, uses cams and levers to close its valves in place of what conventional mechanism?
Desmodromic valve A desmodromic valve is a reciprocating engine valve that is positively closed by a cam and leverage system, rather than by a more conventional spring.
Acid egg The terms acid egg and montejus (or monte-jus) are sometimes used interchangeably to refer to a device with no moving parts formerly used instead of a pump in order to transfer difficult liquids. The principle is that a strong vessel containing the liquid is pressurized with gas or steam, forcing the liquid into a pipe (usually vertical upwards) thereby causing flow. When the liquid has been transferred, the pressure is released and more liquid is put in via gravity. It is thus cyclic in operation. The same principle has been used to lift water and called an "air displacement pump" or "intermittent gas-lift pump", and has been applied to pumping oil up from the formation.