Cam Lobe Centers

Ed Valvo

May 25, 2001
I see posts of cam lobe centers ranging from 109-113. What are the advantages or disadvantages of let's say going from a 109 to a 113 and vice versa? Assuming duration and lift were the same on both cams.... I'm interested in which could make more power and which would have an effect on emmisions.
Wider lobe centers decrease overlap which increases idle vacuum and smooths the idle at the expense of mid and top end. Lower emissions = wider lobe centers, more power = narrower lobe centers. The trick is finding a lobe center that will suit your combination while giving you a good compromise on both of these qualities.