Abstract: An internal combustion engine with improved efficiency provides continuous variable displacement and/or compression ratio tuning to one of a number of fuel types to be used by the engine. By varying displacement without changing the compression ratio, the engine can be tuned to operate on a given fuel more efficiently according to the load demands on the engine. By varying the compression ratio, the engine can be converted for use with the most economical fuel type available. The engine can be of a radial configuration with an offset crankshaft and a common cam throw-piece that can be positioned on the crankshaft to change the stroke and/or compression ratio affected by one or an array of pistons. An onboard electronic control can be used to detect engine efficiency, change engine displacement and/or compression ratio, change fuel supply, and compute fuel economy.

Abstract: A variable displacement engine includes a rotatable crankshaft having a journal, a cam having an eccentric opening that receives the crankshaft journal, a piston rod assembly having one end journalled on the eccentric cam, and the cam also having an arcuately extending cavity that has gear teeth formed in its outer wall that are at a constant radius distance from the radial center of the eccentric opening, and a gear wheel disposed within the cavity and engaging the gear teeth for selectively adjusting the angular position of the cam relative to the crankshaft journal.

Abstract: Controlled variation of piston .displacement and adjustment of compression ratio are achieved by an adjustment mechanism located between the vehicle crank shaft and the piston which changes the effective length of the piston rod. The piston rod is divided into upper and lower portions and the adjustment mechanism connected to both portions at the point of division. The adjustment mechanism allows controlled lateral displacement of the two parts of the piston rod from each other at the point of division while still transmitting energy of motion from the piston to the crank shaft.