[Jay S]

Originally Posted by P@blo

So the lobe area would be the area of the lift ramp pictured?

I'm just thinking out loud but the area seems like a better way to compare measurements instead of valve events at x.xxx. Sorry guys I have to close the loop on this for my brain...

You have the right idea, where the profile holds the tappet open is the area. Area can also be measured out at valve for more accuracy.

Area isn’t very easy to use comparing cams for several reasons. Lift changes area, area over the nose of the cam effects the engine different than it does when the area is changed at the cams overlap. Cams have different seat timing adding area at low lifts instead of over the nose. Profiles can be Assymetrical, and shift more area on the closing side of the ramp from the opening side.. A Crane 041 blueprint cam is an example of those things, it more duration and area above .2” than a Melling SPC-8. The Melling SPC-8 is basically symmetrical, the Crane is very Assymetrical at lower lifts.