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標題: 為什麼說:機油粘度不是越大越好 [打印本頁]

作者: dakala1314    時間: 2011-2-20 06:53     標題: 為什麼說:機油粘度不是越大越好

認為機油的粘度越大越好的觀點是不對的。機油的粘度不僅是機油分類的依據,而且也與發動機功率的大小,運動零件的磨損量、活塞環的密封程度、機油及燃料的消耗量、發動機冷啟動的輕快性、零件的溫度等密切相關。 機油的粘度過大,會有以下幾個方面的缺點: 1、發動機低溫啟動困難 機油粘度過大,在發動機低溫啟動時上油太慢,油壓雖然高,但機油通過量並不多,主要是因為粘度大,油的泵送性能差,此時最易出現暫時的干摩擦或半流體摩擦,這正是發動機摩擦的主要原因。試驗證明,自發動機啟動時,曲軸轉動所需的轉矩大,因此轉速低,不易起著火。 2、功率損失大 機油粘度大,零件摩擦表面的摩擦阻力也就增加,這樣不僅使零件摩損增加,而且摩擦損失功率也增加,另一方面曲軸的攪油阻åŠ
作者: 8ge4CW6z2S    時間: 2017-11-25 04:08     標題: pandora charms san diego rookie network want more data

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