mopowers
Well-Known Member
Can someone explain the difference in performance in the exact same 340 engine with a camshaft with a 104ICL vs a 112ICL if all other cam specs were identical?
Camshaft Intake Centerline?
- Thread starter mopowers
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The 112ICL camshaft will have better idle characteristics. Most Comp Cams are ground on 110ICL.
RustyRatRod
Caput villa stultus
First, we need to find out exactly what you're talking about here. "Intake center line" and "Lobe separation angle" are two completely different things. Intake center line refers to the method by which a camshaft is degreed.
Say you have a cam with a 112 lobe separation angle. Usually they are installed 4* advanced which means the intake centerline would be at 108*, meaning the cam still has the lobe separation angle of 112*, it is just INSTALLED 4* advanced at 108* intake center line.
The lobe separation angle is ground into the cam and cannot be changed. The intake centerline refers to where the cam is installed in the engine. So we need to know which you are talking about.
Say you have a cam with a 112 lobe separation angle. Usually they are installed 4* advanced which means the intake centerline would be at 108*, meaning the cam still has the lobe separation angle of 112*, it is just INSTALLED 4* advanced at 108* intake center line.
The lobe separation angle is ground into the cam and cannot be changed. The intake centerline refers to where the cam is installed in the engine. So we need to know which you are talking about.
Meant to say LSA. Sorry
mopowers
Well-Known Member
Please excuse the ignorance. I don't know a whole lot about camshafts. Trying to learn though.
I was basically just asking what the differences would be with a cam with a LSA of 108* installed at 104*ICL compared to a cam with 112*LSA installed at 108*ICL. Is it application dependent, or are there generalizations that can be made??
I was basically just asking what the differences would be with a cam with a LSA of 108* installed at 104*ICL compared to a cam with 112*LSA installed at 108*ICL. Is it application dependent, or are there generalizations that can be made??
In general if the same camshaft is gorund on different LSA's
The LSA will have an affect on idle and power characteristics. Smaller number = more overlap, choppier idle, peakier power
The ICL will change where the power starts to come in. Intake valve closing earlier in the case of advancing camshaft = more cylinder pressure.
The LSA will have an affect on idle and power characteristics. Smaller number = more overlap, choppier idle, peakier power
The ICL will change where the power starts to come in. Intake valve closing earlier in the case of advancing camshaft = more cylinder pressure.
RzeroB
Well-Known Member
Here is a good piece from Comp Cams that summarizes the effects of differnt LSA and timing of camshafts http://www.compcams.com/Pages/413/cam-timing-lobe-separation-angle.aspx
mopowers
Well-Known Member
Thanks guys. Interesting stuff...
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