They had trouble with the small cams eating lobes. More surface area for the cam followers to run on. This engine replaced the Small Cam 855 series engines and it features a greater camshaft diameter and the introduction of top-stop injectors. The first Big Cam I engines were introduced in 1976.Ĭummins aimed to meet new US government legislation at that time regarding noise levels and clean air requirements. A bigger diameter cam shaft, not more lift. I always thought the big cam was exactly that. What's the difference between a small cam and a big cam 855 Cummins?
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