09-08-2018, 09:22 PM
On my Nippy cams I have made note of inlet opening at TDC closing 60 ABDC, exhaust open 45 ABDC and closing 24 ATDC, lift 3/8". I have also seen published another set of figures which differ slightly from Charles and mine, possibly originating will Bill Sheehan, sorry if thats wrong Bill but it would be interesting to hear from you when you read this. I wonder if the answer is that there are actually three Nippy profiles, two bearing splash fed, two bearing pressure fed and three bearing. I have a three bearing cam and two of the earlier types, not sure if they are from splash or pressure fed engines, I will re measure them all and report back.
I raced for a while with a Nippy cam in my special, however found very worthwhile gains to be had with a good re-profiled cam, I say good because I have come across some pretty average grinds out there. I am no expert when it comes cam profiles, I measure them by performance on the track, I have heard a number of pet theories over the years but I tend to listen to the one or two people with proven track records of reliable grinds.
I raced for a while with a Nippy cam in my special, however found very worthwhile gains to be had with a good re-profiled cam, I say good because I have come across some pretty average grinds out there. I am no expert when it comes cam profiles, I measure them by performance on the track, I have heard a number of pet theories over the years but I tend to listen to the one or two people with proven track records of reliable grinds.
Black Art Enthusiast