pardon my ignorance, but..
I'm looking at cam specs, same manufacturer, and .050/adv #s are within a few degrees of eachother.. but the RPM ranges are wildly different..
I can't see any other real difference except the lift is considerably different. Now I can't really see why, but, how does (if at all) does lift factor into rpm range?

matt

Matt, it can seem onfusing at first when reading cam specs, but give yourself some time to learn all the particulars.

Lift is only one component of a camshaft profile. Two other important aspects: duration, as you noted is usually listed at .050, and there is also lobe separation to consider.

If you go to the major cam company websites they give more explanation than I could easily summarize.

Be careful when considering two seemingly simular camshfts that both camshafts are of the same family, I.E.: hydraulic lifter, solid lifter, hydraulic roller, solid roller.

Thomas

I'm looking at hyd. rollers and solid flats, I have a hyd. roller at the moment.
It just I'm looking at some lunati hyd rollers and cams that otherwise are within 2-5 degrees advertised and .050 seem to have RPM ranges that vary so wildly.
the only huge difference is lift. mabe the higher lift cams are ground different so they rev? I dunno. I'm just trying to figure out what lift has to do with RPM range (start and end) and I guess idle quality too.
my current cam is 286 @ .006, 230 @ .050 and .639 lift.

Matt