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?

dirty_old_chevy

I like! new fuel lobes!

Wnts2Go10O

iTrader: (12)

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.

dirty_old_chevy

yeah, like that 5-point lobe that appears to have sharp corners and doesn't have that much fuel flow... whats that for?

ringram

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.

SNLPerformance

iTrader: (15)

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.

obZidian

iTrader: (2)

Chevy SS must be a typo... Car comes with a ls3/l99.

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.

obZidian

iTrader: (2)

texas94z

It's going to interesting to see when the AFM lifters become a limiting factor.

obZidian

iTrader: (2)

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"