4.4.6 Compression ratio
Compression ratio. This is the ratio between the total volume of the cylinder and the volume of the combustion chamber. This parameter characterizes how many times the air-fuel mixture is compressed in the cylinder. It is usually indicated in the form of a ratio, for example 14:1 (in this case, it means that the volume of the combustion chamber is 14 times less than the total volume). The compression ratio affects the efficiency and power of the engine: the higher is this ratio, the more efficient it is. But there are also limitations due to the characteristics of the fuel used (see below in the section "Feed System of Modern Engines").
Note
In case of the gasoline engine it is impossible to infinitely increase the degree of compression, because this increases the likelihood of knocking of the air-fuel mixture and, as a result, the failure of the entire engine. Knocking will be described in more detail below.
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