Overlap Triangle

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Newbomb Turk said:
Post your cam numbers and I can tell you where the ICL needs to be to center the overlap triangle.

So seat to seat if you have it, LSA/ICL, @ .050 numbers and lift.
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I will give you what I have from the cam card.
Comp Cams 20-718-9
Gross Valve lift (in 654) (ex 655) add 1.6 rocker arms.
Duration @50 (in 269) (ex 276)
Lobe Lift (in .436) (ex .437)
Valve Timing @50 (in open 45) (in close 77)
(ex open 81) (ex close 48)
Lobe seperation 106
 
Danny Bellmore said:
I will give you what I have from the cam card.
Comp Cams 20-718-9
Gross Valve lift (in 654) (ex 655) add 1.6 rocker arms.
Duration @50 (in 269) (ex 276)
Lobe Lift (in .436) (ex .437)
Valve Timing @50 (in open 45) (in close 77)
(ex open 81) (ex close 48)
Lobe seperation 106
Click to expand...

I'm going to assume that Comp called for a 102 ICL. So 4 degrees advance.

To center the overlap triangle you need to install the cam at a 105 ICL.
 
Newbomb Turk said:
I'm going to assume that Comp called for a 102 ICL. So 4 degrees advance.

To center the overlap triangle you need to install the cam at a 105 ICL.
Click to expand...
Thank you for your help. It is much appreciated.
Comp does not specify what it called for, I have it in at 104 currently. I am just trying to get my combination to work optimally with what I currently have.
 
Danny Bellmore said:
Thank you for your help. It is much appreciated.
Comp does not specify what it called for, I have it in at 104 currently. I am just trying to get my combination to work optimally with what I currently have.
Click to expand...

At 104 you are close enough to let it go. I wouldn't change it. Plus its damn hard to find one degree. You may end up with the cam a bit retarded.
 
Newbomb Turk said:
lol yeah, I’m not politically correct.
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BTW, i assume the overlap triangle would be centering the valve events so they happen with tdc right in the center? Just a guess.. had never heard of it before.. kind of curious where my cam would land but it will just make me overthink and go nuts over something that doesn't matter at this point :)
 
Icetech said:
BTW, i assume the overlap triangle would be centering the valve events so they happen with tdc right in the center? Just a guess.. had never heard of it before.. kind of curious where my cam would land but it will just make me overthink and go nuts over something that doesn't matter at this point :)
Click to expand...

Go to mgispeedware.com and click on the camshaft calculator.

You can enter your cam numbers and look at the graph and see what you have.
 
Newbomb Turk said:
I'm going to assume that Comp called for a 102 ICL. So 4 degrees advance.

To center the overlap triangle you need to install the cam at a 105 ICL.
Click to expand...
Well, I guess I will need a new cam and lifters. I pulled the intake off today to mill for more clearance for the valve covers and it appears that I have a bad lobe and another starting to wear. Brand new Comp cam and brand-new Bam bushed lifters.
 
Newbomb Turk said:
Ouch!! What happened??
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I'm not really sure what happened here. I cut all my oil filters open, and I found bronze the middle of the summer. I pulled the Milodon shaft and gear and it was pretty much chewed up. I replaced the gear with one from Comp. I flushed the system as best as I could.
1731702441224.png
 
The good news is if you like the cam it can easily be welded and repaired.

I’ve never run that style of lifter but I’ve been told they are very sensitive to any dirt. Maybe some of that gear found its way past the filter and killed the bushing.

That’s a damn shame for sure.
 
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