Hi Charlie. Just some math to help your friend out. Take the water column reading from the pitot tube and then multiply it by the square root of 66.2. That will give you air speed in feet per second. I have this written on my flowbench. I got it from a book but I can't remember which one. It might have been Harold's book Practical airflow. Andrew
Thanks for the help, I actually just got that book. I will be reading it this week. I THINK I got it sorted out. The issue is trying to scale it up from the 8" of depression I can pull on an SF-110 to equal what it would be at 28".
Yeah 3:24 when a single mod improves the entire flow curve and velocity goes up in key areas you know you are hitting on and improving a core design flaw !
@@luckyPiston The valve isn't flowing to it's fullest capability on the chamber side so the full effects of the changes to the throat ratio aren't being realized.
@@briantayes2418 Yeah i think that area plays on important part maybe even more so than that same area on the intake side , i think gases escaping the chamber are traveling across the exhaust v/v face and have to make a 180* turn there , i think if that relief area is angled slightly it can help those gases make that turn especially at low lift , low lift flow establishes velocity earlier in the lift cycle.
Hi! What happens if you make a big blunder with a port? How can you continue the development with the inferior port? Do you leave ports alone and start with an other one? How often does this happen?
@@laszlototh5956 It happens alot when you start. You get better as you gain experience. If you have to use that casting you fix it the best you can and do not make that mistake on the rest of the ports.
Morning!. I just had a light bulb moment. Mission impossible heads. Does a 318 poly intake rocker fit the L.A. head ? If it does..... could the push rod pitch be completely removed?.
I second the rationale for the throat ratio, I see the spark plug boss is guiding air around the short side, maybe just be mindful of that when you shape the bowl radius . @0:04 the shadowy areas are telling you where the air is not flowing. Even with the light shining towards the intake valve, there's some dark spots on that radius, to me, that seems like flow splitting in two places. Bifurcation in nerd talk.
@@luckyPiston Yep, like waves crashing on a pier. When the valve opens on the exhaust stroke, the airflow conforms to the chamber, and has to flow around that boss. Then the piston starts coming up and pushing out the leftovers. During the upstroke, the boss acts like a squish pad. That boss is put there from the factory to increase turbulence near the plug, during intake and compression strokes.
![FNAF vs TF2 - Episode 2 [SFM]](http://i.ytimg.com/vi/z5b3V2-VLb0/mqdefault.jpg)
Hi Charlie. Just some math to help your friend out. Take the water column reading from the pitot tube and then multiply it by the square root of 66.2. That will give you air speed in feet per second. I have this written on my flowbench. I got it from a book but I can't remember which one. It might have been Harold's book Practical airflow. Andrew
@@andrewburlock2653 That book is excellent. Thanks
Thanks for the help, I actually just got that book. I will be reading it this week. I THINK I got it sorted out. The issue is trying to scale it up from the 8" of depression I can pull on an SF-110 to equal what it would be at 28".
@@TDMP-ThemDamnMoparPeopleTy Glad I could help. I will be converting my bench to electronics but for now I do the math. Andrew
Test Pressure PeakVelocity
1" H2O 66.2 ft/sec
3" 114.7
5" 148.0
7" 175.1
10" 209.3
12" 229.3
15" 256.4
20" 296.0
25" 331.0
28" 350.3
30" 362.6
35" 391.6
40" 418.7
45" 444.1
65" 533.7@@TDMP-ThemDamnMoparPeopleTy
@@TDMP-ThemDamnMoparPeopleTyThis was from SF-300/600 Flowbench Operator's Manual. Hope that helps,
-juhana
Yeah 3:24 when a single mod improves the entire flow curve and velocity goes up in key areas you know you are hitting on and improving a core design flaw !
See, short side for the win.😁😎👍
Good looking work thank you for explaining
@@clarkmcmahan1595 Glad you like it. Thanks
I noticed that the valve has not been unshrouded. That will change how the throat flows.
How will that change how the throat flows ?
@@luckyPiston The valve isn't flowing to it's fullest capability on the chamber side so the full effects of the changes to the throat ratio aren't being realized.
@@briantayes2418 Yeah i think that area plays on important part maybe even more so than that same area on the intake side , i think gases escaping the chamber are traveling across the exhaust v/v face and have to make a 180* turn there , i think if that relief area is angled slightly it can help those gases make that turn especially at low lift , low lift flow establishes velocity earlier in the lift cycle.
Hi! What happens if you make a big blunder with a port? How can you continue the development with the inferior port? Do you leave ports alone and start with an other one? How often does this happen?
@@laszlototh5956 It happens alot when you start. You get better as you gain experience. If you have to use that casting you fix it the best you can and do not make that mistake on the rest of the ports.
@@servediocylinderheads Thank you!
Morning!. I just had a light bulb moment. Mission impossible heads. Does a 318 poly intake rocker fit the L.A. head ? If it does..... could the push rod pitch be completely removed?.
@@approachingtarget.4503 I never worked on a poly and 318 pinch could be removed with welding or epoxy work. Thanks
Hi Charlie do you know a simple way to comparison ports befor and after porting instead flowbench?
@@amirdoshmanfekan5145 Bolt it on an engine.
@@servediocylinderheads to test wich head go faster?
@@amirdoshmanfekan5145 Yep
I second the rationale for the throat ratio, I see the spark plug boss is guiding air around the short side, maybe just be mindful of that when you shape the bowl radius . @0:04 the shadowy areas are telling you where the air is not flowing. Even with the light shining towards the intake valve, there's some dark spots on that radius, to me, that seems like flow splitting in two places. Bifurcation in nerd talk.
So for you looking at that SSR you see more flow in the corners than in that shaded center area ?
Are u also saying that the plug boss is influencing flow on the right hand side of the SSR ?
@@luckyPiston I see more flow in the center of the short side, less so on the valve side, and more so on the cylinder wall side of the throat.
@@luckyPiston Yep, like waves crashing on a pier. When the valve opens on the exhaust stroke, the airflow conforms to the chamber, and has to flow around that boss. Then the piston starts coming up and pushing out the leftovers. During the upstroke, the boss acts like a squish pad. That boss is put there from the factory to increase turbulence near the plug, during intake and compression strokes.
@@luckyPiston On the latest video, there's still noise at low lifts, right where the plug boss would be affecting during the overlap phase.