Please Help Me Decipher My Cam Specs Sheet

dart19666 said

View attachment 1715235961

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...

Yes, I understood what you are saying. The pix is very good. I am still working through whether it is the peak closing rate, or the peak rate over the nose, that matters.

The closing acceleration rate being + means it is applying force to the valvetrain in the opening direction, correct? (Which is not really 'opening' at that point in time, but is stopping the closing action; i.e. bring the valve train to a stop.)

If you pick a lower peak closing rate, does the over-the-nose rate also typical go lower? (Does not seem likely to me...)