cam timing ?'s

[BlueOval Ralph]

When the cam is ground the lobe separation is set. Period. you can't alter it.


Unless you have a new Viper which has what is known as Cam in Cam then centerline CAN be changed as engine is running.. Check into this new tech.

Originally Posted by Adger Smith

Rod,
There are 2 centerlines to a cam. Intake C/L.. Ex C/L and then there is Lobe separation. When the cam is ground the lobe separation is set. Period. you can't alter it. The intake centerline can be placed. By that I mean you can install a cam with the intake C/L where you want it. The ex C/L will follow where you put the I C/L by the number of degrees of lobe separation, Intake C/L to Ex C/L...
Every cam company puts the Lobe separation on the cam card. It can be mixed up for intake centerline. Cams can be ground with the intake C/L moved forward on the dowel pin. Most cam Co's mark that as a +2 or +4 or whatever. Without knowing the brand or seeing your card I'm operating a little blind on this. If you want the cam in @ 108 I C/L degree it that way by the .050 over the nose method. Forget the numbers you are trying to juggle. It will be @ 108 if you put it there.

another note.. Don't believe those dots and numbered slashes on Jesel belt drives. They are very bad about being off a few degrees either way. I consider them as reference points.. Only..