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Flow Numbers
- Thread starterbigblock4g63
- Start date
snailspool
Well-known member
So much Data! Thanks for posting!
manikbastrd
Well-known member
- Joined
- Nov 19, 2009
- Messages
- 660
That's awesome! seems like it justifies using a 2G head, if you do the same work to both. A ported 1mm over 1g head was almost the same as a ported 2g, not to mention if you overbore the valves on the 2g head. Correct me if I am wrong please!
Thanks for the resource!
Thanks for the resource!
donniekak
Well-known member
The Polk level 4 1g head flows 350cfm! The ported 2g heads, and evo heads don't come close.
Last edited:
bigblock4g63
Well-known member
I love the POLK Head. RIP Brother
Just another thing to remember is flow numbers dont mean sh*t if you dont get the right Port Job/ Level Head for what your doing.
also some guys you use flow tubes to get more from a head or use rad plate
Just another thing to remember is flow numbers dont mean sh*t if you dont get the right Port Job/ Level Head for what your doing.
also some guys you use flow tubes to get more from a head or use rad plate
bigblock4g63
Well-known member
like this one made by Control Flow Porting. This is a early 1.6 4G
curtis
Well-known member
Flow Benches are like dynos.....numbers can be altered
Cool you posted this and cool all this was complied at one spot but every bench is a little different, temp and barometric pressure of the day tested etc etc all come into play. Real truth is the before and after using the same head on the same bench. Hell Chris Beran as far as I know still has the HP/mph record with his heads on Mike's Evo and he built his own bench....sorry want give up his secrets but its built from scratch. Damn I need to call him one day. Anyway its all about the area under the curve, If you plot all the numbers on a graph and look at the mid lift numbers instead of top flow a head with more area under the curve makes for a faster car....period. Each cyc;e the valves are closed once and open once but pass through the mid lift numbers twice. Always look at those numbers and pay attention to the top lift number advertized. Lots of places advertize their .600 or .700 lift numbers but if your car has a .500 lift cam .6 and .7 mean about squat sh*t.
Now before I open up the 1g head vs 2g head debacle I'll shut up about the little port boat anchor pos heads. /ubbthreads/images/graemlins/devil.gif
Cool you posted this and cool all this was complied at one spot but every bench is a little different, temp and barometric pressure of the day tested etc etc all come into play. Real truth is the before and after using the same head on the same bench. Hell Chris Beran as far as I know still has the HP/mph record with his heads on Mike's Evo and he built his own bench....sorry want give up his secrets but its built from scratch. Damn I need to call him one day. Anyway its all about the area under the curve, If you plot all the numbers on a graph and look at the mid lift numbers instead of top flow a head with more area under the curve makes for a faster car....period. Each cyc;e the valves are closed once and open once but pass through the mid lift numbers twice. Always look at those numbers and pay attention to the top lift number advertized. Lots of places advertize their .600 or .700 lift numbers but if your car has a .500 lift cam .6 and .7 mean about squat sh*t.
Now before I open up the 1g head vs 2g head debacle I'll shut up about the little port boat anchor pos heads. /ubbthreads/images/graemlins/devil.gif
