Author Topic: Screaming Eagle CNC Heads, Flow Test  (Read 785 times)

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Offline HD Street Performance

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Screaming Eagle CNC Heads, Flow Test
« on: December 29, 2017, 10:30:47 AM »
Here the flow results of SE CNC air cooled heads for a 103 before and after valve job.
No comments other than .200 lift intake howled like a banshee and .5-.7 lifts were turbulent. The saying about the flow being almost entirely in the valve job well in this case was 50% right. The intake had a good seat form but bad port geometry. The exhaust had a 3 angle seat and when fixed the flow came right up.
I do know why the intake was having issues and could fix this but the results are a better case to just use out Street Pro heads for hundreds less at $499 and have a port that is 15cc less in volume and flows ~280.

Offline N-gin

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Re: Screaming Eagle CNC Heads, Flow Test
« Reply #1 on: December 29, 2017, 11:23:36 PM »
interesting resilts.
Would howling or noise mess up flow numbers, or flow in general?
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Offline CarlosGGodfrog

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Re: Screaming Eagle CNC Heads, Flow Test
« Reply #2 on: December 30, 2017, 12:46:37 AM »
Where does the factory CNC ported MVA heads fall ? I have them on a 117 with S&S 570.

Offline HD Street Performance

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Re: Screaming Eagle CNC Heads, Flow Test
« Reply #3 on: December 30, 2017, 09:03:35 AM »
Where does the factory CNC ported MVA heads fall ? I have them on a 117 with S&S 570.
Harley publishes the MVA head flow numbers. This is a much bigger head with larger valves than the head I tested.

Offline HD Street Performance

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Re: Screaming Eagle CNC Heads, Flow Test
« Reply #4 on: December 30, 2017, 09:07:10 AM »
interesting resilts.
Would howling or noise mess up flow numbers, or flow in general?

Yes but I was more concerned with the flat-lined and reversal at the top and turbulence causing the manometer to bounce all over the place.