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a number of valves per cylinder (a)
The number of valves per cylinder name implies: intake valves per cylinder containing the sum of the exhaust valves +.
Tips: What is a valve?
Function Valve (Valve) is responsible for the input of fuel into the engine and exhaust emissions, the conventional engine has only one intake valve per cylinder and one exhaust valve, this design is relatively simple, low cost , easy maintenance, good low speed performance, power drawback is difficult to improve, especially at high speed, low charging efficiency, performance is weak. In order to increase intake and exhaust efficiency, and now use more multi-valve technology, it is common for each cylinder four valves are disposed (there are three or five cylinder valve designs, the same principles, such as the Audi A6 engine), a total of four cylinders that is, 16-valve, we often see the information on the car’s 16V says that a total of 16-valve engine. Such multi-valve structure can be easily formed in a compact combustion chamber, fuel injector arranged in the center, which can make the combustion air mixture more rapid and more uniform, and the weight reduction of the opening degree of each valve properly, the valve opening or closing faster.