Exhaust valve system power
The only moving parts inside simple two-stroke engines are the crankshaft, the connecting rod, and the piston.It is the same simplicity in design, however, that causes a two-stroke engine to be less fuel-efficient and produce high specific levels of undesirableemissions. At the bottom of the power stroke, the transfer ports, which deliver fresh fuel-air mixture, are open at the same ti. To provide more low RPM power, as well as enable the engine to produce a lot of high RPM power, a power valve system is used. All power valve systems vary the duration of the exhaust port open time, which gives the engine usable low end power combined with excellent top end power.
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6 FAQs about [Exhaust valve system power]
What is an exhaust servo motor?
An exhaust servo motor is one component of the exhaust valve system (sometimes called the ex-up or power valve system) found on almost every modern sportbike including all Honda, Kawasaki, Yamaha, Suzuki, BMW, Ducati, Triumph and a few others. The system consist of a few parts, the first is the valve assembly inside the exhaust pipe.
How do exhaust valves work?
These valves act to vary the height (and width) of the exhaust port thereby broadening power delivery over a wider rev range. Exhaust ports with fixed dimensions only produce usable power in a narrow rev range, which also affects fuel consumption and emissions.
What are the components of an exhaust system?
These components include the exhaust valves, actuator, control module, and exhaust pipes. The exhaust valves are responsible for regulating the flow of exhaust gases, while the actuator is the mechanism that physically opens and closes the valves.
Why do I need to replace my exhaust valve?
The exhaust valve system is typically replaced for several reasons including the installation of an aftermarket exhaust that does not have the valve (most full systems and some slip-on exhausts), the valve or servo motor fails and needs to be replaced or removed, or the owner just wants a little more power.
How does a 125cc exhaust valve work?
The valve is a slightly oval shape. This changes the height and size of the exhaust port at different engine speeds, maximizing the available power at all rev ranges, opening up firstly at 3k rpm for low end power, gradually in between 3-6k, fully opening at 6k rpm for maximum power, on most 125cc.
Do two-stroke performance bikes have exhaust power valves?
Many producers of two-stroke performance bikes fit them with the exhaust power valve systems. These valves act to vary the height (and width) of the exhaust port thereby broadening power delivery over a wider rev range.