PUZZLER!!! My new motors a dog! what did I miss?

[AJ/FormS]

108 is not 4 degrees advance for a 110* cam. The comp site shows the XE262H as a 110 cam.
108 is 4* advanced for a 112*LDA
Oh poop, wrong cam!
Got it I think. Lunati pn LUN 10200702LK is a 262/268/112 cam;to be installed at 108. You bet. the .050 numbers are 220/226. This is practically a twin to the Hughes HE2330(223/230) tire fryer I had. Hang in there this thing will be a beast soon.

the 050 points should be; 2/38 and 49/-3. That is to say the intake should be open to .050 at 2*BeforeTDC and should close to .050 at 38* AfterBDC
Is that correct, according to your card?

 

[mbaird]

108 is not 4 degrees advance for a 110* cam. The comp site shows the XE262H as a 110 cam.
108 is 4* advanced for a 112*LDA

I'm just restating what the cam card says....

 

[mbaird]

Cam card.......
Maybe I'm misinterpreting this....

 

[mbaird]

The .050 before and after max lift is what comp recommends ....
So either comp or lunati is wrong. I tried Lunatis method and it was a dog !
So now I will see what it runs like using Comps method.

 

[AJ/FormS]

Post #126 edited
Yeah, I see my numbers are exactly as per the card. Forget the centerline numbers for now,cuz I think they are confuzzing you. If you get the points right,(the 2/38)the centerline will drop in just fine.

 

[mbaird]

Oh.....ok.... AJ your might have my thread confused with another or be remebering a post referring to a comp 268 cam...

I am running a lunati voodoo 262. 70402 cam

 

[mbaird]

P/n changed last year

 

[AJ/FormS]

Yeah I was confuzzed there for a second. Post #126 edited

 

[nm9stheham]

The .050 before and after max lift is what comp recommends ....

I am watching the Comp Cams timing video and they do say that the ICL method uses .050" valve lift below the peak valve lift. Never did it that way. Perhaps Comp specs ICL differently than others.....?? Odd...

 

[AJ/FormS]

I've done that way, but because it seems that by that point the deceleration ramps are engaged, and IMHO the accuracy could be compromised.

 

[fishy68]

The .050 before and after max lift is what comp recommends ....
So either comp or lunati is wrong. I tried Lunatis method and it was a dog !
So now I will see what it runs like using Comps method.

IMO it'll be a bigger dog now cause all you did was retard the timing which takes away low end torque and will lower the cranking compression, that is already too low for what it should be. You should have taken the time to check the exhaust lobe timing to see if the cam was correctly ground, like some of us recommended earlier.

 

[fishmens67]

any verdict yet.

 

[moper]

I've always used the .050" down on the ICL method. By using that, the issues associated with asymmetrical lobes are minimized because you're only using the very beginning of each ramp (opening and closing). Unless you map each ramp you probably won't be able to determine the actual ICL on an assymetrial lobe anyway. But at least at that point you will know exctly where the manufacturer's ICL is. IMO, it's a fairly low priority to worry about different opening or closing ramps using the ".050" method.
I am curious to see how the engine runs though - given the solution to the problem.