Speed-Talk is running on www.Speed-Talk.com

IMPORTANT: Update your bookmarks to https://www.speed-talk.com/forum/
(Right-click the URL and select "Bookmark this link")

video on velocity and sound

General engine tech -- Drag Racing to Circle Track

Moderator: Team

SpeierRacingHeads
Vendor
Posts: 551
Joined: Sun May 13, 2012 1:28 pm
Location: KS
Contact:

video on velocity and sound

Post 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

Image

Image
Speier Racing Heads
Chad Speier
785-623-0963
williamsmotowerx
Expert
Expert
Posts: 763
Joined: Sat Feb 10, 2007 1:24 pm
Location:
Contact:

Re: video on velocity and sound

Post 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?
SpeierRacingHeads
Vendor
Posts: 551
Joined: Sun May 13, 2012 1:28 pm
Location: KS
Contact:

Re: video on velocity and sound

Post 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.

Image
Speier Racing Heads
Chad Speier
785-623-0963
User avatar
frnkeore
Expert
Expert
Posts: 510
Joined: Wed Dec 25, 2019 3:06 am
Location: Oregon

Re: video on velocity and sound

Post by frnkeore »

What does the SSR look like?
SpeierRacingHeads
Vendor
Posts: 551
Joined: Sun May 13, 2012 1:28 pm
Location: KS
Contact:

Re: video on velocity and sound

Post by SpeierRacingHeads »

frnkeore wrote: Wed Oct 20, 2021 2:13 pm What does the SSR look like?
You do not have the required permissions to view the files attached to this post.
Speier Racing Heads
Chad Speier
785-623-0963
User avatar
frnkeore
Expert
Expert
Posts: 510
Joined: Wed Dec 25, 2019 3:06 am
Location: Oregon

Re: video on velocity and sound

Post by frnkeore »

It looks kinda sharp from the pictures. Could you do a solder wire bend around it?
SpeierRacingHeads
Vendor
Posts: 551
Joined: Sun May 13, 2012 1:28 pm
Location: KS
Contact:

Re: video on velocity and sound

Post 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.
You do not have the required permissions to view the files attached to this post.
Speier Racing Heads
Chad Speier
785-623-0963
Fusion Works
Member
Member
Posts: 70
Joined: Tue Jun 09, 2015 10:24 am
Location: Huntsville, AL

Re: video on velocity and sound

Post by Fusion Works »

What does it do with a full intake tract?
SpeierRacingHeads
Vendor
Posts: 551
Joined: Sun May 13, 2012 1:28 pm
Location: KS
Contact:

Re: video on velocity and sound

Post 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.
Speier Racing Heads
Chad Speier
785-623-0963
SpeierRacingHeads
Vendor
Posts: 551
Joined: Sun May 13, 2012 1:28 pm
Location: KS
Contact:

Re: video on velocity and sound

Post 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.
Speier Racing Heads
Chad Speier
785-623-0963
BLSTIC
Pro
Pro
Posts: 408
Joined: Wed Dec 05, 2018 7:14 pm
Location:

Re: video on velocity and sound

Post 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?
Fusion Works
Member
Member
Posts: 70
Joined: Tue Jun 09, 2015 10:24 am
Location: Huntsville, AL

Re: video on velocity and sound

Post 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?
SpeierRacingHeads
Vendor
Posts: 551
Joined: Sun May 13, 2012 1:28 pm
Location: KS
Contact:

Re: video on velocity and sound

Post 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.
Speier Racing Heads
Chad Speier
785-623-0963
1980RS
Expert
Expert
Posts: 610
Joined: Thu Oct 13, 2016 10:03 am
Location:

Re: video on velocity and sound

Post 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

Image

Image
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. :mrgreen:
BradH
Guru
Guru
Posts: 1178
Joined: Wed Apr 03, 2013 11:34 am
Location:

Re: video on velocity and sound

Post 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. #-o
Post Reply