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Originally Posted by renault_megane_dci
Wich is only really suitable on engines with rocker arms.
I believed the CBR 600 was a DOHC with the cams on top of the valves.
Anyway, cam phasing sounds like it has more potential (angle wise) and is not detrimential to durability wich valve clearance increase can be.
Of course cam phasing needs the cam sprocket to be trimmed wich is not always possible and always more fiddle than enlarge valve clearance on a rocker arm setup.
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I think reducing lift isn't that big of a deal since at idle you're pretty screwed no matter what in terms of charge motion and bikes run at pretty high rpm otherwise.
The cams are chain driven right? I guess the teeth are quite big then. Bike cams have a giant amount of overlap, so you could probably get away with just shifting the cam position by one entire tooth, but if that one entire tooth is like 20 degrees then the later intake valve opening could induce quite a bit of pumping loss at higher rpm. From looking up CBR600RR cam pictures on google though, I'm counting like 36 teeth or something on the cams, so one entire tooth might not be so bad at 10 degrees. The later valve closing would push the power peak up quite a lot though since bike cams close pretty late already...might not be bad for top speed run
