Sorry for the poor quality; this is just a scan of a hand-drawn chart. Hope you all can make it out and some of you find it useful.
It was all measured in a mocked up engine with a stand-in solid lifter, except for the CB 2252 which was taken from a built engine with hydro lifters and is incomplete. I took lift at the cam itself (indicaed by C"), and then lift at the valve with 1.1 and 1.25 rockers. Interesting how much changing ratios alters the opening/closing events' timing, and in ways that aren't entirely predictable.
The MV and DH OEM cams were serviceable used ones, but the figures may vary by a couple degrees and the lift could be a bit more on a new stick. The CB 2252 had 10k miles on it, the 2254 was unused.
I set up a repeatable process and did the measurements at least twice for each. The degree points could vary +/- 1 degree; I would say lift is within a couple thou.
For each cam, there is the calculated lobe center angle (LCA), the duration at 0.050" lift based on my measured lift points, degree position at 0.001" open and close, and 0.050" open and close. In the middle is maximum lift either at the cam or the valve ("LIFT @ L.C"), and the degree point where it occurs.
I wouldn't estimate myself what the advertised durations might be; I think it's particularly irrelevant where hydro-grind cams are concerned anyway. Where an advertised duration is indicated, it is CB's figure, not mine.
Enjoy the lumps!
