conventional Port Deactivation 绝对不是什么常规性气口,还老化…… 误人子弟啊!PDA是菲亚特发动机独有的一种技术,看下文:
PDA (Port De-Activation) system which "ensures high exhaust gas recirculation, resulting in combustion stability at low speeds and optimal performance at high speeds together with improved fuel efficiency." The PDA system also reduces emissions.