Can someone confirm cam lobe order for me?

[1FastBrick]

My Stuff is at the machine shop right now. Does one know the Arrangements of the intake and Exhaust lobes on the Duramax camshafts???

Is the first lobe an Intake or an Exhaust lobe? Not concerned with the firing order.

 

[ikeG]

Forward most lobe is for cyl 1 intake valves.

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[1FastBrick]

Forward most lobe is for cyl 1 intake valves.

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Thank you! I am trying to look at some Cam doctor Information and I want to make sure we marked it correctly.

 

[1FastBrick]

I found this picture in an article Motortrend wrote about alt firing orders. https://www.motortrend.com/how-to/what-is-an-alternate-firing-duramax-cam
Moving the Stock 1-2-7-8-4-5-6-3 to the ALT 1-5-6-3-4-2-7-8

 

[JoshH]

That looks correct to me. What info did you find out on your cam doctor?

 

[1FastBrick]

I found out I need some one smarter to operate it and give the correct info... lol

I had an LBZ cam checked to confirm specs. Then a stage 1 wagler cam checked.

 

[1FastBrick]

The lobes were not labeled correctly on the report. But what I don't know is if there is an option to put the rocker ratio value in for the lift at the valve measurement. I had the LBZ cam re-measured and while the lobe lift is withen less than .001 from the previous time, the lift at valve spec is different. Almost like it had a 1.5 ratio the first time and a 1.6 ratio this last time.
And that's the same for the intake and exhaust if you take the lobe lift and put it at that ratio Vs. The real ratios on a Dmax.

 

[Harshman]

Here is a stock LLY cam

 

[1FastBrick]

Which software is that?
It looks like the LBZ Spec for peak lobe lift

 

[Harshman]

Performance Trends software

 

[1FastBrick]

Here is the LBZ cam.

 

[1FastBrick]

So I think this software can use the rocker ratio like yours However i think they just left it at 1.5 for both lobes.

The top lobe should be the intake lobe.

 

[Harshman]

Lift looks the same. Little different in duration @ .050 and separation.
I checked an LML but some how it didn't get saved. I might have the print out.
Top lobe in your picture should be exhaust.

 

[1FastBrick]

Thanks! For some reason I thought we had it backwards.

Would the Numbers at .050 be affected by the rocker ratio value?

Where are you located?

 

[Harshman]

Cam lift numbers will not be affected by rocker ratio.
I am at 21719

 

[1FastBrick]

Here is the Wagler Stage 1 standard firing order cam.

 

[Harshman]

Sometime in the next couple days I will show you what I am going to put in mine if I ever get time.

 

[1FastBrick]

Thank you for shareing what you have measured.

 

[TheBac]

In my experience, lift numbers WOULD be affected by rocker ratio. Duration would not.

 

[PureHybrid]

Yes and no. Solid roller type stuff depends on lash too, but increased rocker ratio will add a touch of duration after the initial ramp. I don't have any experience with this cam profile equipment, this is from measuring at the valve stem