fishy68, the duration (amount of time that the lobe lifts the lifter, measured in degrees) is not effected by the rocker ratio.
Of course it's not. I never said it did.
The "duration" is simply a measurement of where lift starts and ends, not how much.
Yes that's right. But it is a measurement taken at the valve, not the cam lobe.
The "duration at .050" will change slightly because the rocker has a higher ratio and will have the valve open a little bit further, faster. Duration at .050" lift is a tool (so to speak) to give you an idea of how aggressive the cam lobe is.
Understood, although I'm not sure calling it a tool is correct since it's a rating just like total duration except it's more precise
The "advertised duration" is the actual duration of the cam.
The "duration" will remain the same while the lift increases across the board.
Here is where the problem lies. It is the duration at valve lift. Not at the cam lobe.
In other words, the duration of the cam does not change, the amount of lift does.
