4.5.7 Variable valve height
In modern gasoline engines, the amount of the fuel mixture is regulated by the means of throttle gate: the throttle gate opens, more air flows in, and more fuel is injected accordingly. The air, which is necessary for preparing the fuel-air mixture until it reaches the cylinder, will overcome several very "unpleasant" obstacles: an air filter, a throttle gate, and other valves. These are all losses that directly affect the power of the internal combustion engine. Try breathing in a gas mask yourself while doing exercises under stress… That's how the engine "breathes hard". Throttle gate is one of the obstacles in the path of air, which the designers dreamed of getting rid of. However, how to adjust the amount of intake air then? The solution was again related to valves. They came to the conclusion that it is necessary to adjust the valve opening height. There were systems with stepwise regulation of the valve opening height, namely: the valve could be opened only to three different heights. Then they came up with a system of steeples valve opening with a range from 1 mm to 10 mm. This allowed to get rid of the throttle valve - the engine could "breathe" easier. However, getting rid of the throttle gate by changing the valve opening height is not an end in itself. Valve operation control allows you to further refine the operation of the four-stroke internal combustion engine.
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