这时期被称为气门重叠。
配气正时和气门重叠变通用于不同的发动机。
不同的发动机，其配气相位和气门重叠是不一样的。
This is called valve overlap. Valve timing and valve overlap vary on different engines.
为了避免这种危害，通常采取的办法除了减小气门重叠角外，就是在进气管安装防爆装置。
Conventional measure to avoid the damage is to install explosion proof equipment in intake pipe besides decreasing valve overlap Angle.
为了避免这种危害，通常采取的办法除了减小气门重叠角外，就是在进气管安装防爆装置。
Conventional measure to avoid the damage is to install explosion proof equipment in intake pipe besides decreasing valve overlap Angle.
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