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video on velocity and sound
Posted: Wed Oct 20, 2021 11:09 am
by SpeierRacingHeads
IMO this shows that SHAPE is KING over all else. 172cc port, flows all the way until the retainer touches the guide.
Super fast airspeed and shape is on display.
https://youtu.be/xXZ-H_34h-A
Re: video on velocity and sound
Posted: Wed Oct 20, 2021 11:56 am
by williamsmotowerx
It seems like you have quite a bit of bowl fill.
There's usually slow air on the bench in that area, do you see gains on the dyno filling that?
Re: video on velocity and sound
Posted: Wed Oct 20, 2021 12:07 pm
by SpeierRacingHeads
williamsmotowerx wrote: ↑Wed Oct 20, 2021 11:56 am
It seems like you have quite a bit of bowl fill.
There's usually slow air on the bench in that area, do you see gains on the dyno filling that?
I have never not done them that way, so no back to back. The rule is 172cc final volume. So have to make legal.
Here is what the ports look like finished. Raise the floor and roof.
Re: video on velocity and sound
Posted: Wed Oct 20, 2021 2:13 pm
by frnkeore
What does the SSR look like?
Re: video on velocity and sound
Posted: Wed Oct 20, 2021 2:26 pm
by SpeierRacingHeads
frnkeore wrote: ↑Wed Oct 20, 2021 2:13 pm
What does the SSR look like?
Re: video on velocity and sound
Posted: Wed Oct 20, 2021 2:48 pm
by frnkeore
It looks kinda sharp from the pictures. Could you do a solder wire bend around it?
Re: video on velocity and sound
Posted: Wed Oct 20, 2021 3:00 pm
by SpeierRacingHeads
frnkeore wrote: ↑Wed Oct 20, 2021 2:48 pm
It looks kinda sharp from the pictures. Could you do a solder wire bend around it?
FAR from sharp or abrupt.
Re: video on velocity and sound
Posted: Wed Oct 20, 2021 3:09 pm
by Fusion Works
What does it do with a full intake tract?
Re: video on velocity and sound
Posted: Wed Oct 20, 2021 3:11 pm
by SpeierRacingHeads
Fusion Works wrote: ↑Wed Oct 20, 2021 3:09 pm
What does it do with a full intake tract?
As far as velocity? Localized like in the video slows 50-70 fps. Maybe more in some areas.
Re: video on velocity and sound
Posted: Wed Oct 20, 2021 3:57 pm
by SpeierRacingHeads
50-70 fps with the manifold attached. Problem is checking localized velocities with a carb/manifold on it.
Port flows 283cfm with the valve upside down. Min CSA is 1.72in².
And it's all about the sound.
These engines make crazy power for the CSA and flow the head gives them. Heads are very efficient for the port volume.
Re: video on velocity and sound
Posted: Wed Oct 20, 2021 4:39 pm
by BLSTIC
williamsmotowerx wrote: ↑Wed Oct 20, 2021 11:56 am
It seems like you have quite a bit of bowl fill.
There's usually slow air on the bench in that area, do you see gains on the dyno filling that?
I have always wondered why that filled area even exists. What purpose does it serve? And is it worth having it given the velocity improvements you get from filling it?
Re: video on velocity and sound
Posted: Wed Oct 20, 2021 4:58 pm
by Fusion Works
SpeierRacingHeads wrote: ↑Wed Oct 20, 2021 3:57 pm
50-70 fps with the manifold attached. Problem is checking localized velocities with a carb/manifold on it.
Port flows 283cfm with the valve upside down. Min CSA is 1.72in².
And it's all about the sound.
These engines make crazy power for the CSA and flow the head gives them. Heads are very efficient for the port volume.
What type of class/engine?
Re: video on velocity and sound
Posted: Wed Oct 20, 2021 4:58 pm
by SpeierRacingHeads
Fusion Works wrote: ↑Wed Oct 20, 2021 4:58 pm
SpeierRacingHeads wrote: ↑Wed Oct 20, 2021 3:57 pm
50-70 fps with the manifold attached. Problem is checking localized velocities with a carb/manifold on it.
Port flows 283cfm with the valve upside down. Min CSA is 1.72in².
And it's all about the sound.
These engines make crazy power for the CSA and flow the head gives them. Heads are very efficient for the port volume.
What type of class/engine?
NHRA Super Stock. Usually 350-358's.
Re: video on velocity and sound
Posted: Wed Oct 20, 2021 5:10 pm
by 1980RS
SpeierRacingHeads wrote: ↑Wed Oct 20, 2021 11:09 am
IMO this shows that SHAPE is KING over all else. 172cc port, flows all the way until the retainer touches the guide.
Super fast airspeed and shape is on display.
https://youtu.be/xXZ-H_34h-A
Chad you always have good stuff to show people, thanks for sharing. I learn something new every time I watch your videos. Now I just need to apply it to my stuff and beat up on the locals a bit.
Re: video on velocity and sound
Posted: Wed Oct 20, 2021 9:44 pm
by BradH
Is that Splash Zone in those ports?
Whatever it is, it looks to be far more "user friendly" than what I experienced when attempting to use Belzona 1111 to downsize some intake manifold runners.
