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Reverse-flow cylinder head : ウィキペディア英語版 | Reverse-flow cylinder head
In engine technology, a reverse-flow or non-crossflow cylinder head is one that locates the intake and exhaust ports on the same side of the engine. The gases can be thought to enter the cylinder head and then change direction in order to exit the head. This is in contrast to the crossflow cylinder head design. == Disadvantages ==
The reverse flow design is generally considered to be inferior to a crossflow design in terms of ultimate engineering potential for two reasons. Firstly, there is limited space when inlet and exhaust ports are arranged in a line on one side of the head meaning a reduction in port area compared to a crossflow head. This mainly affects power delivery at high rpm by limiting airflow. Secondly, since inlet and exhaust manifolds are both on the same side of the engine and in close proximity, the inlet manifold and carburetor (if applicable) are heated by the exhaust. This heating reduces the density of the inlet charge and hence the volumetric efficiency of the engine. In a spark-ignition petrol engine the heat also increases the likelihood of pre-ignition or detonation which limits the allowable compression ratio reducing both power and efficiency.
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