高速下,手排車打錯檔會怎樣? - 汽車
By Callum
at 2021-11-02T18:24
at 2021-11-02T18:24
Table of Contents
有網友分享了一台BMW M2C誤入低檔後,瞬間炸引擎的影片
老實說,我很好奇
高速高檔誤入低檔,汽車不容易,循環檔機車倒是時有發生
但即使是用硬幹的進去,也很少有聽說當下立刻發生大毛病
而且變速箱齒輪、同步環、離合器都沒事,反而是炸引擎?
後來追了一下,發現那是M2C自己設計上的問題
而且問題也不是出在引擎,而是出在曲軸同步正時的hub上
簡單講,就是控制曲軸正時鍊條的舵輪,在突然大扭力下與曲軸不同步滑差
因此正時不對,活塞把氣門頂壞了,這是S55引擎的設計缺陷
如果還是看不懂沒關係,反正那是M2C的個案,你應該也不會去買手排M2C
回到原來主題,一般手排車,5退2硬幹進檔,如果不是超高轉速
應該是不會有太大問題,頂多就是一些機械機構的小內傷
對手排變速箱來說,離合器片、飛輪、齒輪、同步環等都是耗材小問題
零件不貴,貴在工錢,而且修完就是一條活龍,不會有太大後遺症
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