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Scooter exhaust with expansion chamber and silencer. On a two-stroke engine, an expansion chamber or tuned pipe is a tuned exhaust system used to enhance its power output by improving its volumetric efficiency.
A 4-2-1 exhaust system is a type of exhaust manifold for an engine with four cylinders per bank, such as an inline-four engine or a V8 engine. The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head , and merge into two pipes (secondary), which in turn finally link up to form one collector pipe.
The design using exhaust valve(s) is common in on-road, off-road, and stationary two-stroke engines (Detroit Diesel), certain small marine two-stroke engines (Gray Marine Motor Company, which adapted the Detroit Diesel Series 71 for marine use), certain railroad two-stroke diesel locomotives (Electro-Motive Diesel) and large marine two-stroke ...
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 ...
Cylinder and ports, viewed from above. Schnuerle porting [1] [2] is a system to improve efficiency of a valveless two-stroke engine by giving better scavenging.The intake and exhaust ports cut in the cylinder wall are shaped to give a more efficient transfer of intake and exhaust gases.
The SR50 DITECH uses the Synerject gasoline direct injection (GDI) system developed jointly by the Orbital Corporation and Siemens AG. The system uses a crank-driven air compressor to deliver air to the cylinder head at a pressure of 5 bars (500 kPa; 73 psi), thereby avoiding the use of carburation; the cylinder walls are not wet with gasoline, only with lubricating oil.
The Yamaha Zuma is an air-cooled 49 cc two-stroke scooter made by Yamaha Motor Company.It is also marketed as the Yamaha BWs, [2] and the MBK Booster.. The Zuma has a 14 mm Teikei carburetor with automatic choke, reed-valve induction, a fan-assisted cooling system, an autolube oil-injection system with an indicator light located on instrument panel which alerts rider when oil level gets low ...
The system is more complicated compared to manual pre-mixing, although it is easier for the end user. If for any reason the oil pump fails to operate properly, chance of damaging the engine is very high. The two-stroke oil tank in scooters and motorcycles is usually hidden from direct view of the rider and needs filling up occasionally.
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