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Pneumodromic ValveThe Pneumodromic valve is called such because it is actuated in either direction solely by pneumatic pressure. Significant energy savings are provided by having no springs in the valve train, and no camshaft, rocker arms, or cam followers. This system requires an onboard computer to manage the time, duration, and lift of each valve in each cylinder, and can do so without linking mechanically one valve’s movement with another. Cylinders can therefore be managed differently from each other; a cylinder could be taken out of the power process when not needed, and no compression need occur.  Click the picture to see the animation Complete control of valve lift and timing provides a means of improving both fuel economy and reduction of harmful emissions. A Pneumodromic valve will generally weigh substantially less than the conventional valve it replaces. Moving parts which weigh less consume less energy to move and manage. In spark ignition engines using the new LIM system, the intake valve will serve as the throttle. The digital management system will open the intake valve with the piston near TDC, then the valve will be kept open until at or after BDC, holding the cylinder open and in fluid communication with the intake manifold until only the amount of (generally) stoichiometric mixture needed for the level of power sought by the operator remains in the cylinder. Even if such valves cannot be proven for the exhaust function, the benefit of lighter intake valves which are fully controlled by a CPU and air pressure, as opposed to the limited system in use since 1875, will provide fuel economy and attendant emission improvements. The savings from eliminating the camshafts, timing gear and conventional valve train parts will exceed the cost of adding the controller and the compressor required for the system, which is already offset by eliminating the camshaft and all its attendant valve train parts. Simple Cycle Engines SPRINGLESS
In our Simple Cycle engines, exhaust leaves via the ports around the girth of the cylinder. Air for combustion and incidental cooling is admitted through the patented valves, spring or Pneumodromic, at the top of the cylinder.Cylinder pressure is ample to keep the valves closed during compression and combustion; Pressure in the input manifold is greater than that of the cylinder only when the exhaust ports are exposed, allowing exhaust to escape; the valves are opened by air pressure, which is always accumulating in the input manifold when the valves are closed. Physical work leading to this concept began in 1999; four US patents have been issued, and one more applied for. International patents are pending, nearly everywhere. Existing prototypes and tests confirm the feasibility of both our original valve designs and the Simple Cycle engine.
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Thank you for taking a look at our innovative engine. A single cylinder working prototype exists. Its patented cycle works well with either a spring managed valve including a simple means of variable valve timing by non-cyclical adjustment of the valve retrieval spring, as shown in the 
