nm9stheham said

I saw those numbers and was very intrigued.... But, if you don't mind my asking, isn't the absolute value of the 'over the nose' acceleration the most important one in determining the spring requirements and keeping the lifter on the lobe? Once the acceleration has gone + again on the closing ramp, then the lifter is already in contact with the lobe...

Do you happen to know the units of acceleration used on this card? Just not clear to me....[/QUO

If the ramp is to steep without enough spring pressure to keep contact with ramp at a high rpm, they will free fall. Also Hydraulic lifters are much heavier that solid lifters so these numbers are much more critical. Here is a pic of a gen III hemi cam that had the same problem. I had to angle the pic so you can see.

Click to expand...