Generation V Internal Engine 2013-20xx LT1

new cams are out...

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Old Nov 6, 2013 | 01:55 PM
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Default new cams are out...

http://www.compcams.com/Pages/434/cpg-new-products.aspx

Anyone know what N and D stand for and why there are 2 numbers for each grind?
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Old Nov 6, 2013 | 03:47 PM
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I like! new fuel lobes!
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Old Nov 6, 2013 | 06:03 PM
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im interested to know what the advantages/disadvantages are of those fuel lobes or if comp is throwing them all out to see who does what with them.
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Old Nov 6, 2013 | 11:51 PM
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yeah, like that 5-point lobe that appears to have sharp corners and doesn't have that much fuel flow... whats that for?
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Old Nov 7, 2013 | 03:40 PM
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I think 5 lobes is to smooth out delivery pressure if you read the text that goes with it.
At least thats what I got from it.
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Old Nov 8, 2013 | 06:04 PM
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Originally Posted by ringram
http://www.compcams.com/Pages/434/cpg-new-products.aspx

Anyone know what N and D stand for and why there are 2 numbers for each grind?
Looking at the advertised vs @.050" duration it appears the ramp rates are softer on the D lobes for better valvetrain stability with the AFM lifters and the N lobes are for the cylinders that have regular lifters and do not shutdown or deactivate with AFM.

Last edited by SNLPerformance; Feb 25, 2014 at 01:00 PM.
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Old Nov 27, 2013 | 08:30 PM
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Chevy SS must be a typo... Car comes with a ls3/l99.
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Old Nov 27, 2013 | 08:58 PM
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The N and D must correspond to the standard and DOD lifters. Slightly different lobe shapes to handle the slightly different responses from the two styles of lifter. Shows how they coordinate them. Also gives info in case someone measures the ca once they get it.
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Old Dec 4, 2013 | 12:56 AM
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Originally Posted by Proxses
The N and D must correspond to the standard and DOD lifters. Slightly different lobe shapes to handle the slightly different responses from the two styles of lifter. Shows how they coordinate them. Also gives info in case someone measures the ca once they get it.
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Old Dec 4, 2013 | 01:28 AM
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It's going to interesting to see when the AFM lifters become a limiting factor.
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Old Dec 4, 2013 | 11:36 AM
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All the talk I'm hearing from folks is revolving around the "limitations" of the stock cam driven fuel pump.

These new lobes "address it" however physically the pump can only pump so much. Now it would be interesting to see how the "cam pump" and the regular fuel pump in the tank work together to yield sufficient fuel at a given hp level. With that, the stock cam pump yields 2175psi with .224 of lift and I would like to know how taxed is that pump at the factory hp rating of 450-460. If it's maxed well......

The stock stuff might be ok for regular street cars but what about those that have 1100-1300rwhp "streetcars"
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