Abstract: A two-cycle engine for boosting intake pressure for higher performance per displacement. The two-cycle engine includes a crankcase having a blower housing and a crankshaft therein extending through the blower housing. The blower housing has an intake opening and a discharge opening. An impeller is disposed around the crankshaft. At least one cylinder is provided with a corresponding piston therein. The cylinder has an exhaust port located on a side wall of the cylinder. An intake conduit extends along the side wall of the cylinder in a spiral rising towards the top of the cylinder and passing beneath the exhaust port to terminate at a pair of intake ports in the side wall of the cylinder. A boost plenum has an intake tube fluidly connecting the discharge opening of the blower housing to the boost plenum. The boost plenum also has a discharge tube fluidly connecting the boost plenum to the intake conduit.

Abstract: A number of embodiments of two-cycle engines employing Schnurle-type scavenging. In addition and in some embodiments, a ramble port is also incorporated so as to introduce a tumble charge into the combustion chamber and reduce the likelihood of fresh charge from exiting from the exhaust port. This tumble charge may be utilized to achieve stratification, and the fuel charge may be delivered to the combustion chamber through the tumble port or in proximity to it. Various arrangements are shown for controlling the amount of scavenge flow to improve stratification and fuel vaporization.

Abstract: A number of embodiments of two-cycle engines employing Schnurle-type scavenging. In addition, a tumble port is also incorporated so as to introduce a tumble charge into the combustion chamber and reduce the likelihood of fresh charge from exiting from the exhaust port. This tumble charge may be utilized to achieve stratification, and the fuel charge may be delivered to the combustion chamber through the tumble port or in proximity to it. Also, arrangements are shown for controlling the amount of tumble flow.

Abstract: In an inlet system for a two-cycle internal combustion engine which includes a cylinder with a piston reciprocating therein between a top dead center position and a bottom dead center position and in which at least two rows of scavenging air flow passages are arranged in separate flow planes around the cylinder adjacent the bottom dead center position of the piston which are closed by the piston when it is remote from the bottom dead center position, each of the separate flow planes includes independent air flow control components for independently controlling the admission of scavenging air to the scavenging air passages in the different flow planes.

Abstract: Using a centrifugation effect, the fresh air introduced to the working chamber (1) of the engine is prevented from mixing with the combustion gases intentionally retained in the latter from one cycle to the next. The means for introducing pressurised fuel (10) are arranged so as to inject the fuel directly into the central zone (G) of the chamber (1) where the concentration of the retained combustion gases and the temperature are thus made maximal, which makes it possible to reduce the ignition delay of the fuel.

Abstract: A two-stroke internal combustion engine is provided with a cylinder and a piston reciprocatingly mounted in the cylinder; the cylinder has two inlet ducts each having a inlet port opening into the cylinder for delivering a inlet strain to the cylinder and an exhaust duct having an exhaust port opening in the cylinder for removing an exhaust product from the cylinder with the inlet ducts and ports disposed so that the inlet stream impacts the wall of the cylinder at a substantially identical location between the exhaust port and an end of the cylinder opposite the piston with the inlet ports and exhaust ports arranged to eliminate crossing of the inlet streams and the exhaust stream.

Abstract: A two-stroke cycle reciprocating internal combustion engine for spark ignition and crankcase scavenging comprises a fuel injection nozzle and an arbitrarily operable throttle valve, which is provided in an air intake passage in upstream of leaf spring dampers, which are biased in a cloging sense.

Abstract: In known two-stroke internal combustion engines with piston-controlled intake passages for the fresh charge and one or more exhaust passages for the exhaust gases, the actual direction of flow will deviate from the theoretical flow direction defined by the passage walls because of the influence exerted by the piston edge. The scavenge flow is deflected in the direction of the exhaust passage and the cylinder head, which will cause increased losses of fresh charge. This will considerably lower scavenge efficiency, and thus lead to a marked deterioration of engine performance, fuel consumption and exhaust emission. In the invention these disadvantages are avoided by aligning the flow guide vanes such that they form an angle, preferably of 90.degree., thus acting as a flow director.

Abstract: A combustion chamber and scavenging configuration for a two-cycle internal combustion engine. The combustion chamber is comprised of an offset recess surrounded by a squish area. An exhaust port is formed on the side of the cylinder opposite to the area where the recess is offset while the intake or transfer ports are disposed on the side to which the recess is offset. The transfer or scavenge ports are configured so as to open progressively first diametrically opposite to the exhaust port and then in an area extending around the area toward the exhaust port.

Abstract: A porting system for two-cycle internal combustion engines has two exhaust ports located on diametrically opposed sides of the cylinder. A pair of intake or by-pass ports are symmetrically positioned on each side of the two exhaust ports. The flow of fuel mixture is laminar and has a pattern which is inward and slightly upward from each intake port. As incoming streams collide, the gas flows upwardly and forms two mushrooms. Then, the flow is downwardly along the cylinder axis. The downward flow divides into two streams flowing radially outwardly from the center of the cylinder and out the two exhaust ports. With this flow pattern, there is a minimum of mixing of intake and exhaust gases, and as compared to the prior art, more unburned gas is retained in the cylinder to improve power output and reduce fuel consumption.

Abstract: A two-stroke cycle nonscavenged internal combustion engine operates under controlled detonating conditions without damage to the engine and with greatly enhanced fuel economy. The engine may have any desired number of cylinders operating initially on a two-stroke cycle with spark and then under auto ignition conditions. A variable compression device is provided in each cylinder to store excess energy liberated at peak pressures and to release it back to the piston during its power stroke. A Scotch yoke connection between the piston rod and crank shaft is laterally guided to eliminate side thrust. A bounce piston shock absorber is provided to assist piston reversal and dampen inertia forces.

Abstract: A two-stroke cycle gasoline engine including at least one two-stroke cycle uniflow scavenging power cylinder-piston assembly which has a scavenging port configuration which consists of first, second, and third scavenging port configurations which are successively uncovered by the power piston as it moves from its top dead center to its bottom dead center, wherein the first scavenging port configuration has a substantially smaller opening area than the second or the third scavenging port configuration, and the first and the second scavenging port configurations give substantially stronger swirl to fuel-air mixture discharged therefrom than the third scavenging port configuration, which gives substantially no swirl to fuel-air mixture discharged therefrom, and the first and second port configurations are closed when the engine is operating at relatively low load above idling and below a predetermined delivery ratio, such as 0.4.

Abstract: A two-stroke cycle diesel engine having: at least one two-stroke cycle power cylinder - piston assembly incorporating uniflow scavenging and having two horizontally opposed pistons, at least first and second scavenging ports and two crankcases which may perform crankcase compression; a pump assembly including at least one scavenging pump cylinder - piston assembly of the reciprocating type which is separate from and is driven by the power cylinder - piston assembly; and a scavenging air introducing device which introduces scavenging air compressed by the pump assembly to the first and the second scavenging ports through first and second passage systems, respectively; wherein the first passage system is interrupted before the pump assembly reaches its top dead center so that thereafter the scavenging air compressed by the pump assembly is all supplied to the second scavenging port which is adapted to generate strong swirl flows in the power cylinder when scavenging air at high pressure is supplied in a large a

Abstract: Disclosed herein is an internal combustion engine comprising a cylinder, a piston movable in the cylinder between top dead center and bottom dead center positions, and an air entry port located in the cylinder adjacently above the piston when the piston is at bottom dead center and adapted to be opened and closed in response to piston movement, which air entry port extends generally tangentially from the cylinder so that air entering the cylinder through the port swirls within the cylinder, together with valve means preventing flow from the cylinder and permitting flow into the cylinder.