head cfm

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gwhammy

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Sep 14, 2006
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Has anyone flowbenched the different year heads on the cr to see which one is best and how much can be gained by porting them? Just wondering!
 
Ill bet this one takes a while for someone to post a reply too. I cant seem to finda shop anywere that has flowed a CR head.
 
03-06 flow the exact same, intake and exhaust,@ 28" of water within 1%.
 
I'm guessing better than the second gen head but how much? Are you willing to part with some numbers Robertp?
 
Lets just see some CFM number to show what all the fuss is about. That would end alot of questions.
 
2nd gen does not flow as well as 3rd gen heads in stock casting. Sorry flow #'s are proprietary untill our race truck is running well enough to brag about it.
 
No one has shown any proof that the 3rd gen head flows better is all it should or i think it does. NO 100% certainties.
 
What could possibly be proprietary about head flow, even of a ported head, its all about the port design? there is more in a valve job then most will ever know, I have watched Chris franks at RayMac spend days on valve angles on head design, this is flow numbers of the NitroFlash Head, about 3 years ago, the numbers are even better now, but these are the only numbers I have on my computer at the firestation .


For those that don’t know or realize, the core to any project is the cylinder head. And its good old fashion grinding that makes a difference, and forget about extrude hone, it doesn’t even make a dent in air flow.

Also notice that the port stalls out at .400 lift, this was a big factor in the design of my MaxSpool 2 and 2.5 camshaft profiles for stock headed Cummins. The MaxSpool MaxRev profile in the NitroFlash truck works with this head and ZZ intake combination. There are 6 heads in stock and ready to ship at Dr Performance Diesel Power Specialist Warehouse.



Lift Intake exhaust stock intake
.050----- 49.3---- 40.7------- 31.3
.100----- 93.4---- 74.9------- 51.2
.150---- 123.1--- 110.6------- 93.5
.200---- 150.7--- 137.3------ 110.1
.250---- 173.2--- 164.9------ 121
.300---- 195.5--- 182.6------ 133.1
.350---- 209.4--- 195.9------ 139.4
.400---- 220.7--- 205.5------ 139
.450---- 230.1--- 213.2------ 133
.500---- 236.4--- 218.8------ 133
.550---- 240.0--- 223.5------ 133
.600---- 242.2--- 225.7------ 133
open----272.2--- 253.6------ 133
 
COMP461 said:
What could possibly be proprietary about head flow, even of a ported head, its all about the port design? there is more in a valve job then most will ever know, I have watched Chris franks at RayMac spend days on valve angles on head design, this is flow numbers of the NitroFlash Head, about 3 years ago, the numbers are even better now, but these are the only numbers I have on my computer at the firestation .


For those that don’t know or realize, the core to any project is the cylinder head. And its good old fashion grinding that makes a difference, and forget about extrude hone, it doesn’t even make a dent in air flow.

Also notice that the port stalls out at .400 lift, this was a big factor in the design of my MaxSpool 2 and 2.5 camshaft profiles for stock headed Cummins. The MaxSpool MaxRev profile in the NitroFlash truck works with this head and ZZ intake combination. There are 6 heads in stock and ready to ship at Dr Performance Diesel Power Specialist Warehouse.



Lift Intake exhaust stock intake
.050----- 49.3---- 40.7------- 31.3
.100----- 93.4---- 74.9------- 51.2
.150---- 123.1--- 110.6------- 93.5
.200---- 150.7--- 137.3------ 110.1
.250---- 173.2--- 164.9------ 121
.300---- 195.5--- 182.6------ 133.1
.350---- 209.4--- 195.9------ 139.4
.400---- 220.7--- 205.5------ 139
.450---- 230.1--- 213.2------ 133
.500---- 236.4--- 218.8------ 133
.550---- 240.0--- 223.5------ 133
.600---- 242.2--- 225.7------ 133
open----272.2--- 253.6------ 133
Click to expand...
Not sure what flow bench your using but we just pulled a few heads off the flow bench and stock intake never saw over 100cfm while exhaust never saw over 110cfm, these are all @ 28" of water and at 70* temp @ .400 lift.

Now after valve angle and pocket work alone we are seeing well over 30% in air flow across the board.
 
It don't look like the stock head is any better than the sec gen head. Do any of the 24 valve heads have induction hardened seats or are they all inserts?I'm just trying to figure the best head to get to port and oring.
 
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