Ported head
#22
I haven't found a CNC head that I couldn't beat by hand. They are good for getting the job out the door and consistent if the core is consistent.
#23
EvoM Guru
iTrader: (6)
A few notes:
- For the sake of maintaining perspective when comparing apples to oranges, a 1500whp VR38DETT (GTR) is 395hp/L. This is equivalent to a 2.0L EVO making 780whp.
- While there is nothing that technically prevents optimized CNC ports from being duplicated by hand, this isn't standard fare. Achieving the same individual flow characteristics and consistency as the CNC work, and proving it, would be both far more time consuming and more expensive than CNC porting.
This is why AMS picked up 33whp on their 518whp 2.3 (93 octane) simply by swapping their own proven hand-ported race head for an optimized CNC port with no other changes:
https://www.evolutionm.net/forums/au...head-test.html
Just FYI
- For the sake of maintaining perspective when comparing apples to oranges, a 1500whp VR38DETT (GTR) is 395hp/L. This is equivalent to a 2.0L EVO making 780whp.
- While there is nothing that technically prevents optimized CNC ports from being duplicated by hand, this isn't standard fare. Achieving the same individual flow characteristics and consistency as the CNC work, and proving it, would be both far more time consuming and more expensive than CNC porting.
This is why AMS picked up 33whp on their 518whp 2.3 (93 octane) simply by swapping their own proven hand-ported race head for an optimized CNC port with no other changes:
https://www.evolutionm.net/forums/au...head-test.html
Just FYI
Last edited by Ted B; Mar 27, 2014 at 10:50 AM.
#24
A few notes:
- While there is nothing that technically prevents optimized CNC ports from being duplicated by hand, this isn't standard fare. Achieving the same individual flow characteristics and consistency as the CNC work, and proving it, would be both far more time consuming and more expensive than CNC porting.
This is why AMS picked up 33whp on their 518whp 2.3 (93 octane) simply by swapping their own proven hand-ported race head for an optimized CNC port with no other changes:
https://www.evolutionm.net/forums/au...head-test.html
Just FYI
- While there is nothing that technically prevents optimized CNC ports from being duplicated by hand, this isn't standard fare. Achieving the same individual flow characteristics and consistency as the CNC work, and proving it, would be both far more time consuming and more expensive than CNC porting.
This is why AMS picked up 33whp on their 518whp 2.3 (93 octane) simply by swapping their own proven hand-ported race head for an optimized CNC port with no other changes:
https://www.evolutionm.net/forums/au...head-test.html
Just FYI
I totally stand by the fact that there has not been a cnc head come here that we could not improve on. It's more then just a port. It's the valve job too. The Cosworth is one head that benefits greatly from a better valve job. Pick up 10-20 cfm on that thing everywhere!
But what do I know. We only do it everyday...
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