degreeing a slant camshaft with no cam card
So far, I'm finding that the readings above .200" lift and below .050" lift have more variation with the centerline than the ones from .050" - .200" lift. Those are pretty close to +/- 1° when I calculated the lobe center.
Both cams seem to have the same profile for intake and exhaust valves.
I feel that the variation on the top and bottom of the lift are because the valve is slowing down and there is more "room for error" in catching the marks as they stay in the same place longer, and can have a few degrees where it reads the same (if you follow what I mean here).
You did a good job taking the data. It looks good so far, I just have to filter it out a little more.
The readings below .050 are the toughest especially with the engine set-up on the stand, as mentioned it does not turn smoothly in some spots. From what I can make of it the bearings must wear more at certain positions and the bearings in this engine must be really worn in certain positions.
Also ( like you said ) it seems to me that because things really slow down when things get low it makes it tough to get things really accurate.
I want to learn more about what can be done with centerline figures. I have done a search on-line but am not finding much of anything.
It seems to me from what I have read here that a cams centerline cam tell me a few different things.
Any suggestions on where I can read something that will clue me in on the uses for this measurement?
Trying key words like what are the uses for a camshaft centerline are not proving helpful.
I guess also I am confused in regards to overlap at the camshaft centerline.
Since the camshaft is asymmetrical ( assuming from what I have read that this means the ramps on each side are not the same shape ) than how measuring down both sides and assuming that the center of these two points is the center is going to work??
If the intake side is broader/longer than the exhaust than @.050 on the intake side will not be the same distance down the side of the cam if my thinking is correct??
And one last question......Lets say the cam were symmetrical, and I were to find the center point on the degree wheel for this event ( AKA intake centerline ) how would this coincide with any of my opening/closing points on the few specs I do have?
I will have to re-read prior posts, maybe that answer is there and I overlooked it cause it confused me at the time.
