Abstract: To improve the precision of the control of the charge of a cylinder during idling and low revs/light load operation, a bypass feeding path of low flow capacity provides the cylinder with air or mixture while the high flow capacity intake valves stay closed.

Abstract: The piston is connected to the crankshaft via a connecting rod, while the crankshaft is disposed between the wrist pin and the combustion chamber. This way the combustion is shifted to the slow dead center, enabling the diesel to perform at higher revs, improving the spark engine efficiency and making HCCI combustion easier. Though the crankshaft is of one piece, more connecting rods can be used for a piston. As opposed piston, the PRE engine further combines top specific power, top thermal efficiency, built in scavenging pumps, and compactness.

Abstract: A compact and lightweight portable flyer. Compared to the prior art, it is like an oversimplified synchropter without any casing or frame, without special control equipment, without servomechanisms. The body of the pilot is the sensors and the servomechanisms: just like a rider controls his bike with his body movements.

Abstract: The combination of the Fully Variable Valve Actuation or FVVA system with the Desmodromic control results in a fully functional FVVA rid of valve springs and any other kind of the restoring springs of the art.

Abstract: A Fully variable mechanical VVA, or FVVA, achieves more than the Lost Motion VVAs and the Constant Duration VVAs can jointly offer, because the FVVA provides the infinite valve lift profiles a Lost Motion VVA can provide, and the infinite valve lift profiles a Constant Duration VVA can provide and infinite more infinities of different valve lift profiles. The FVVA provides an infinity of valve lifts, and each valve lift can be combined to any duration, from infinite available.

Abstract: For the conversion of a reciprocatory into a rotary motion or vice versa, a reciprocating member is acting upon at least one cam of a driveshaft. Among the benefits and advantages resulting from the choice of the cam profile, there is the possibility of a single cylinder engine which is full balanced, with respect to forces and moments, and a three-in-line which is balanced as perfectly as the Wankel rotary, i.e. perfect balance not only as regards inertia forces and inertia moments, but also as regards inertia torques. It turns out that the form of the profile of the cam and the location of its axis of rotation, relatively to the axis of the reciprocation are substantially limitless.

Abstract: A valve lifter is activated selectively by one of a plurality of cams, either via displaceable rollers or via tappets having rotatable grooves on top, to provide discrete or stepwise multimode operation and deactivation. The hydraulic control is only an option since the pure mechanical control is adequate. Easy to retrofit into existing engines.

Abstract: A variable valve gear particularly for internal combustion engines, in which a control cam of a camshaft acts, by way of pair of swivellably coupled levers, to a valve to produce an adjustment of the valve stroke. The valve stoke can vary continuously from a maximum lift to zero lift while the valve clearance can remain unchanged.

Abstract: A variable valve gear particularly for internal combustion engines, in which a control cam of a camshaft acts, by way of pair of swivellably coupled levers, to a valve to produce an adjustment of the valve stroke. The valve stoke can vary continuously from a maximum lift to zero lift while the valve clearance can remain unchanged.

Abstract: An internal combustion engine is arranged with a piston-rod which is kept at a minimum thickness because it is secured on a pin which comprises slider means, sliding on slideways secured to the casing. As a result, the compactness of the combustion chamber, defined between the piston and the crankcase, as well as the valve area are both kept at a maximum, whether these valves are the intake and exhaust valves of a 4-stroke or the exhaust valves of a 2-stroke engine. Directly driven camshafts, inside the crankcase, provide a valve gear train of a minimum inertia and constitute available counterweight shafts in the case of a 2-cycle engine for balancing first order forces and first order moments.