YankeeVert.

For idle lope what overlap is the most important the one at .050 lift or the one at .006 lift ? With a 224/224 , 114 LSA cam there is a 4* difference in overlap at .006 lift between the XE and XE-R lobes. Will this make a noticable difference in idle lope?

s346k

iTrader: (4)

the higher the number, the more overlap. the overlap @ 50 will be the same as 60, just numerically lower because of the input value being lower.

how aggressive the lobe is has very little to no bearing on the idle.

Ragtop 99

iTrader: (7)

The XE-R will idle a little better than XE for a given duration at .05. It is rounding error with a decent tune on a cam like that.

YankeeVert.

What do you mean by rounding error? When I plug the values into the spredsheet for cam calculations I get 49* overlap for the XE lobe and 45* for the XE-R lobe. Are you saying that the calculations on the spreadsheet are off by that much? Not trying to be a smartass, just trying to learn/understand.

Thanks