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A stroke is the action of a piston travelling the full length of its cylinder.In a two-stroke engine, one of the two strokes combines primarily the intake stroke and the combustion stroke, while the other stroke primarily combines the compression stroke and the exhaust stroke, though technically since both ports are exposed during both the combustion and compression strokes, some reversion ...
The physical inertia of reed valves means that they are not as entirely precise in action as rotary valves, a rotary valve engine may run better than a reed valve engine at a small rpm range but the reed valve engine often runs better over a wider rpm range. More sophisticated designs partly address this by creating multi-stage reeds with ...
Section view of Mota-10 reed/leaf valve. A leaf valve, also known as a reed valve, is a type of check valve that only allows fluid to flow in a single direction. These valves use thin pieces of metal, fiberglass, or carbon fiber, known as reeds, leaves, or petals, to form a barrier between two chambers.
This motor was based on previous models KE-7 Lightning and KF-7 Super 10 Lightning. Upgrades included redesigned connecting rods, upgraded aluminum clamp and swivel brackets, a new higher RPM magneto, improved porting, an 8 Reed valve cage (as opposed to KE-7 and KF-7's 4) and larger crankcase opening.
The reed valve is a simple but highly effective form of check valve commonly fitted in the intake tract of the piston-controlled port. It allows asymmetric intake of the fuel charge, improving power and economy, while widening the power band. Such valves are widely used in motorcycle, ATV, and marine outboard engines.
The reed valve opens when the crankcase pressure is slightly below intake pressure, to let it be filled with a new charge; this happens when the piston is moving upwards. When the piston is moving downwards the pressure in the crankcase increases and the reed valve closes promptly, then the charge in the crankcase is compressed.
The common valve spring system is satisfactory for traditional mass-produced engines that do not rev highly and are of a design that requires low maintenance. [1] At the period of initial desmodromic development, valve springs were a major limitation on engine performance because they would break from metal fatigue.
The first known outboard motor was a small 11 pound (5 kg) electric unit designed around 1870 by Gustave Trouvé, [9] and patented in May 1880 (Patent N° 136,560). [10] Later about 25 petrol powered outboards may have been produced in 1896 by American Motors Co [9] —but neither of these two pioneering efforts appear to have had much impact.