Author Topic: Survival heads flow sheet for hand ported by JDC  (Read 7785 times)

gyrrjseerex

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« Reply #6 on: November 28, 2015, 11:34:39 AM »
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gyrrjseerex

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« Reply #5 on: November 28, 2015, 11:34:07 AM »
Дайджест THE-CROWD —
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gyrrjseerex

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« Reply #4 on: November 28, 2015, 11:33:35 AM »
Дайджест THE-CROWD —
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Joe-JDC

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Re: Survival heads flow sheet for hand ported by JDC
« Reply #3 on: May 02, 2014, 03:58:55 PM »
I did not measure the port, nor did I change the opening or wall shapes or dimensions very much.  I mostly cleaned up the port, but ported around the guides considerably trying to bias the flow towards the swirl shape of the combustion chamber on the intake.  The exhaust is considerable larger than most FEs, but I only tweaked the short turn and raised the roof around the guides.  I check the pitot pressures when a port goes turbulent to see where the turbulence is located.  When the flow shears off the roof and clings to the short turn the flow goes sonic on the floor and the pitot will peg the machine.  The roof of the port will have almost no airflow and the pitot pressure is almost unmeasurable.  Ideally, you want the flow centered in the port and highest pitot pressures in the center of the port.  I have not CC'd the intake for volumn, so I cannot address that issue.  Barry says his CNC port is about 207cfm if I remember correctly.  These are probably not quite that large, but close.  Simply going to a larger valve and increasing the throat percentage will increase the flow on both sides of the head.  I try to shoot for 89-90%intake 88-89%exhaust, or >70% exhaust bias.  Joe-JDC

FErocious

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Re: Survival heads flow sheet for hand ported by JDC
« Reply #2 on: May 02, 2014, 04:39:06 AM »
  Joe, what is the CSA of that intake port? Have you pitot probed the port to determine the port airspeed, both average and localized? I imagine that the CSA , MCSA and bowl sections are relatively large. I will guess that the port configuration is best suited for the larger engines or higher rpm engines.
 
 Oh,and pictures are always nice.... 8)   ;)

Joe-JDC

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Survival heads flow sheet for hand ported by JDC
« Reply #1 on: April 28, 2014, 09:55:35 PM »
I am building a 468FE with 4.250" bore and 4.125" stroke and 6.800" rods.  Ported my Survival heads with 2.200"/1.710" 11/32" stem valves.  Turned out nice, and without increasing the intake port volumn much.

.100       76.78        53.62
.200     143.92     108.70
.300     207.78     161.98
.400     270.08     202.48
.450     291.91     217.06
.500     309.73     226.78
.550     316.42     233.26
.600     325.33     239.74
.650     334.24     244.60
.700     343.16     248.81
.750     345.83     250.75/272.13
.800     350.29     250.75/272.13/2"pipe

Flowed at 28" on SF-600 4-28-2014.  One of the best FE heads to be hand ported I have flowed in a while.  I am looking forward to getting this one on the dyno one day soon.  Joe-JDC
« Last Edit: April 28, 2014, 09:57:53 PM by Joe-JDC »