electric valves Snowmobiles - Polaris, Ski Doo and Arctic Cat exhaust Variable Valve System Basics
They may be called "APV" by Arctic Cat, "RAVE" by Ski-Doo or " VES "by Polaris. If you own a snowmobile 2 stroke made over the last 15 years, the engine is probably equipped with "power valve variable exhaust." If that is the case, you probably know that you need to be very diligent in cleanliness and operation. This is an engine component to be monitored regularly to maintain peak performance.variable exhaust power valves are devices located in the engine exhaust port moving. the variant of each brand is to provide the same essential service and that is to vary the height and width of the exhaust port depending on the speed of the motor. This greatly expands the power range. at low revs, the valves are closed, which promotes more complete combustion. this improves torque at low and minimizes the residual gases in the exhaust stream. at high rpm, the valves are wide open allowing the optimum exhaust flow. This allows the engine rev freely and produce maximum horsepower top end. The old systems were powered by a mechanical link that opened and closed the valves based on the engine speed. Modern systems are operated by electronic actuators that position the valve precisely throughout the rev range. Before the advent of the supply valve, engine manufacturers had to determine a size and shape of the exhaust and the exhaust pipe opening. This predetermined if the engine provide optimal power delivery either high, medium or low speed range. The supply valve allows the two-stroke engine to provide usable power over the entire RPM range of operation.The modern diet valve system has evolved from a number of changes over the last 30 years. Yamaha was the first company to find success with this concept when they incorporated a variable exhaust power valve system in their 2-stroke Grand Prix motorcycle road racing in the late 1970s technology then made its way to the road of production and motocross bikes Yamaha early 1980. others soon came motorcycle manufacturers with their own systems. In early 190, almost all motorcycles with two high performance time, mountain biking, water-craft and personal snowmobiles were equipped with systems of power variable exhaust valves.Keep clean energy valve system is of paramount importance. That the supply valves are located directly in the course of flow of the exhaust gases, carbon deposits can build up on the valve over time. The deposit accumulation can change the shape of the valves and change the flow characteristics of the exhaust gas from the engine. In extreme cases, the exhaust port may become completely clogged and costly damage can occur. Deposits can also can impede the movement of the valve or leave them stuck in one place. Each of these scenarios will significantly affect the power delivery and output of your engine.The task of maintaining the power valve system of your snowmobile is not complicated. Your service or your owner's manual will give specific instructions on how to remove and clean the system. Be careful when cleaning the valves, as you do not want to scratch or sand surfaces. Your manual will also provide a specific service interval and should be followed religiously.Once your taps are clean, there are ways to prevent premature filing of the valve. First and foremost is to make sure your machine is set correctly. Excessively rich carburetor jetting is a major contributor to this disease. rich jetting allow too much fuel in the combustion chamber, which promotes the formation of carbon. If your snowmobile is fuel injected, make sure the system works properly. Also make sure that your oil injection system delivers the right amount of oil. Conduct regular spark plug readings as described in the manual. If your modules readings are off and you can not determine the cause, contact your dealer.Another major contributor to the deposit supply valve is the use of poor quality 2-cycle oil. Stocks and basic additives used in cheaper lower quality oils can be cooked in carbon deposits quickly. synthetic oil for two high-quality time is notorious for its clean combustion characteristics and will dramatically lower the deposit formation rate. Synthetic oils are using good quality base oils and high temperature sophisticated additives, which are designed to avoid the filing valve power. They also have a package / dispersant effective detergent that allows a much cleaner operation. When it comes to two times the injector oil, you definitely get what you pay for. Spend a little more on an oil that is specifically designed to provide operation of the valve clean energy will not only improve the performance of your engine, it will save headaches and expense that come with premature filing of the supply valve.Snowmobiles operated at low speed and RPM stable over extended periods of time can also promote deposit build up. During such operation, the valves to maintain a fixed position, thus forming deposits. If the valves are constantly changing positions, there is less deposit formation of opportunity and increasing the size.variable exhaust power valves have revolutionized the capabilities of 2-stroke engines. With a little maintenance and care, they offer performance without problems.
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