macuserman wrote: ↑Mon Mar 09, 2020 12:09 pm
@suprf1y it was mentioned to me that some cam profiles may require me to use mechanical vs hydraulic lifters? What’s the cuttoff point for the cams you make and is there any disadvantage to having to switch from hydraulic to mech?
Mechanical lifter profiles require mechanical lifters, and hydraulic lifter profiles require hydraulic lifters. The profiles themselves are actually different. There are positives and negatives to both, but these days, and for our purposes either one is good. I don’t sell any solid lifter profile cams because there’s no need for them on the G series engine. It’s one thing when you have a valve train with a cam in block, lifters, rockers, and pushrods (where most of the myths come from - the small block chevy days), or a small bucket style lifter opening little valves. The DOHC arrangement on the G series engine allows for high RPM on hydraulic lifters with no valve float.
On the G series I’ve never seen an application where I thought there was an advantage to run mechanical lifters, so while I do have some solid lifter profiles, I don’t sell any. Setting them up is a pain, and there are no real advantages.