alright, I've got a fairly decent understanding of cams, I just need to know 3 things real quick:

1. what is the lobe seperation angle?(this is more in relation to the other two questions)

2. how does the lsa relate to the lobe center angle?

3. how does it relate to the intake/exhaust centerline?


basically I'm trying to make my own cams on desktop dyno to figure things out, but when i look up camshaft specs I only seem to be able to find out the lsa, and not the other two, so I can't be as accurate as possible.

if anyone can help me out, thanks.

p.s. I would've searched if the search feature was on, heh.

 

Read this:

http://www.compcams.com/Technical/TimingTutorial/

 

thanks.

 

Sorry to dig up an old thread, I'm just trying to figure this out as well and the article wasn't all that clear. Does it mean that I should enter in the lobe separation angle in both the "Intake Centerline" and "Cam Lobe-Center Angle" fields in Desktop Dyno?

 

... bump ...
after a bit of searching on Google, it seems advertised LSA would be one of the input fields and the other may or may not be information released by the cam manufacturer... can anyone confirm this?

 

The manufacturer might give out the LCA, but if not it can be estimated as the midpoint between the opening and closing angles.

 

The lobe separation angle is the angle of degrees between intake lobe centerline, and exhaust lobe centerline you just add them together and devide by two: 106+114=220 220/2= 110 Lobe sep. Intake centerline is just cam timing where you degree it in at. SBC standard timing is 110 Comp grinds their cams 4 degrees advanced to counter timing chain slack so you degree them in at 106 if you don't use degree bushings and set the chain to 0. The lobe sep. clues you in to the amont of overlap, LCA is often an interchangeable term. It depends on the cam company. Intake centerline is timing, Lobe separation angle Is the degrees between the two lobes LCA when not referencing a particular lobe means the same thing.

~Couch