cam specs dont match when degreed
Thank you everyone for the responses and information, I really appreciate you guy's taking you time to give me some feedback on this. I contacted Oregon and they said they check em at .100 so I'll run that next and see what it says. I have a clothes double roller that is adjustable so I'll retard it to 108 if needed. My only question and it's because I'm curious if I advance a cam from 106 to 103, wouldn't the exhaust go from 114 to 111?
@yellow rose could you explain why if you got any time. I'm interested in learning something new if possible.
Again thank you all for your feedback and responses to the thread , it's my first engine build and since my machineshop teacher passed away recently I have no one else to help me with this.
Think about what you are asking. PRH already gave a good explanation of it, but consider the matter.
The intake and exhaust lobes NEVER change position relative to each other. Sooooo...if your cam is ground on a 110 Lobe Seperation Angle, that means that no matter what you do, the angle between the intake and exhaust lobe on any given cylinder must add up to 110.
Soooo...if you install your cam on a 106 Intake Center Line, the exhaust center line MUST BE 114 (106 plus 114 equals 220 divided in half equals 110).
If you move the Intake Center Line to say...100 then because the lobe position on the cam is fixed, the exhaust center line MUST be 120 because the sum of the intake and exhaust center lines MUST equal 110, which is the Lobe Seperation Angle.
So let's say you decide you want to install the cam with a 114 Intake Center line. Why you would do that, I can't say, but we are doing math so...why not.
If the Intake Center line is now 114, because the lobe position is fixed, the exhaust center line MUST BE 106, because the sum of the two must equal 110.
So think about this until you get your head around it.
Go to mgispeedware.com and put all your cam numbers into the program and then change your intake center line and see what happens.
You can see graphically what you do when you move the intake center line around.
