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Please explain cam lobe overlaps to me.
Hi,
I’m guessing that it has something to do with rotation direction or some other odd deal, but looking at my two 77 CIS cams, one side has both of the lobes almost exactly together meaning both intake and exhaust open at the same time? While the other side they are spaced probably about 120 degrees from each other. My tiny brain can’t make sense of this, hopefully one of you smarter guys can give a good explanation? Thanks. http://forums.pelicanparts.com/uploa...1524431884.jpg |
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SC cams don't have much overlap but earlier S did here's what an S looks like, the overlap period is near the end of the exhaust stroke and continues into the beginning of the intake stroke http://forums.pelicanparts.com/uploa...1524438379.jpg SC http://forums.pelicanparts.com/uploa...1524439878.jpg Physically the look different because they need to be asymmetric because one rotates clockwise and the other counter clockwise http://forums.pelicanparts.com/uploa...1524439748.jpg |
Both cams turn ccw.
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Thanks Bill,
Like I said, my simpleton brain sometimes tales a bit to spool up and your explanation and the pictures bumped something loose and I realized my thought that both valves would be open at the same time because the lobes are next to each other doesn’t hold true because the valves aren’t right next to each other. Best, Rutager |
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Thanks guys, Rutager |
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