Quote:
Originally Posted by GTX JOHN
We run the old Isky Square Cams that are the same ones
as we ran in the 80s. They were designed Al Etter ( Ken's
Dad RIP) and Don Studley ( Shane's Dad RIP).
We have spent Thousands on Stocker Cams but always
go slower!
These Old School Cams are BRUTAL on the Valvetrain
and we do not recommend them to most people!.
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Those old school cams are still used by many. I believe that when Don closed GK, John at Bullet Cams purchased some of the tooling. Cam Dynamics was also ahead of their game with dwell lobes too. Do not know what happened to Cam Dynamics tooling after they were split and acquired by other companies. Glen Steyer's was the man at Crane Cams for Stock Eliminator cams. Glen now has his own camshaft business and still makes some great cams.
With the advent of the spring rule allowing higher spring pressures, it allowed racers to take full advantage of the dwell lobes, called by many, square lobes. As a result, rocker arms and lifters subsequently became the next weakest valvetrain component to fail and as a result, the rule change to allow solid lifters and aftermarket rocker arms.
Those that have access to and pay for Spintron testing, will find and discover they can make more power with less aggressive lobes and less spring pressure.
Reducing reversion before TDC is the key. Earlier intake valve openings allow for higher pressure exhaust gases. The less reversion, the earlier airflow starts after TDC. When camshafts have an optimized area at mid-lift and higher lift, it allows the valve to have more time to fill the cylinder with an air/fuel mixture with higher inertia.