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Re: Header thread [Re: moparx] #3063372
07/28/22 04:55 PM
07/28/22 04:55 PM
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Posts: 4,381
On the parachute mount
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n20mstr Offline
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Originally Posted by moparx
mentioning bullhorns, what advantage do they serve ?
i am asking this because i seem to be seeing more of them on fast cars.
TIA for helping me to understand.
beer


ON a car with no wheelie bars, they are supposed to add (from the exhaust velocity aimed up) almost 30lbs to the front, without carrying 30lbs if that makes sense.
Helps keep the front down

Last edited by n20mstr; 07/28/22 04:55 PM.

....BAD A$$ STREET CAR.....
Re: Header thread [Re: JERICOGTX] #3063373
07/28/22 04:55 PM
07/28/22 04:55 PM
Joined: Aug 2003
Posts: 39,982
Bend,OR USA
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I'm assuming Bullhorns mean the collector pointing up outside the body, correct or not?
I would be temted,if i had set, to try pointing them back towards the rear bumper for additional ET work devil
Greedy I BE whistling grin


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Header thread [Re: n20mstr] #3063604
07/29/22 12:45 PM
07/29/22 12:45 PM
Joined: Sep 2003
Posts: 16,429
north of coder
moparx Offline
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Originally Posted by n20mstr
Originally Posted by moparx
mentioning bullhorns, what advantage do they serve ?
i am asking this because i seem to be seeing more of them on fast cars.
TIA for helping me to understand.
beer



JericoGTX : Downforce. While not a lot, on a fast car, you take every bit of advantage you can to not get air under the car.


n20mstr : ON a car with no wheelie bars, they are supposed to add (from the exhaust velocity aimed up) almost 30lbs to the front, without carrying 30lbs if that makes sense.
Helps keep the front down



thanks for helping me understand this guys ! up bow
beer

Re: Header thread [Re: Al_Alguire] #3063644
07/29/22 02:44 PM
07/29/22 02:44 PM
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Originally Posted by Al_Alguire
Nice tape biggrin

Looking good.


You know us body guys , we use masking tape for everything.
Tape removed

0D89B90C-4818-4481-A576-B5EF3B96709B.jpeg65248B60-ECB2-414E-9631-2E50A3C7E67F.jpeg

....BAD A$$ STREET CAR.....
Re: Header thread [Re: n20mstr] #3063843
07/30/22 11:34 AM
07/30/22 11:34 AM
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weld

13DDE95D-FDFF-45B2-9394-37207CCAA336.jpeg

....BAD A$$ STREET CAR.....
Re: Header thread [Re: Cab_Burge] #3063885
07/30/22 02:34 PM
07/30/22 02:34 PM
Joined: Feb 2015
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CA
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Originally Posted by Cab_Burge
I'm assuming Bullhorns mean the collector pointing up outside the body, correct or not?
I would be temted,if i had set, to try pointing them back towards the rear bumper for additional ET work devil
Greedy I BE whistling grin


Drag from the tube hanging outside the body would likely outstrip any "thrust" from the headers

Re: Header thread [Re: crackedback] #3064100
07/31/22 03:15 PM
07/31/22 03:15 PM
Joined: Sep 2003
Posts: 16,429
north of coder
moparx Offline
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Originally Posted by crackedback
Originally Posted by Cab_Burge
I'm assuming Bullhorns mean the collector pointing up outside the body, correct or not?
I would be temted,if i had set, to try pointing them back towards the rear bumper for additional ET work devil
Greedy I BE whistling grin


Drag from the tube hanging outside the body would likely outstrip any "thrust" from the headers




that's one thing [among others] that makes me not quite understand why bullhorns are used.
beer

Re: Header thread [Re: moparx] #3064111
07/31/22 04:24 PM
07/31/22 04:24 PM
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Bend,OR USA
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When it comes to aerodynamics testing Mopar did a bunch of that using crepe paper strips on one of their test Dusters back in the mid 1970s filming it and then looking at each frame from the starting line to the finish line in the 1/4 mile.
I've seen the same testing done on small racing airplanes the nose, fuselage, wings, rudder and tail designs all come into play on aerodynamic drag,
I owned and flew a Piper 260 Comanche single engine 5 place airplane, it would average around 180 MPH indicated air speed straight and level on 60% full power above 9500 Ft. above sea level, the fuel consumption got a lot better the higher you flew do to needing to lean it out for the thinner air up
We were flying back to SO CA from visiting our grandkids in Seatle WA, we were above a cloud layer at 11,500 ft the outside air temps were right at 5 F, the ride was very smooth, and I was bored so I started playing around with prop pitch RPM, sliding my seat all the way back as far as it would go made the airplane speed up around 4 MPH boogie
Slowing the prop speed down from 2400 RPM to 2300 RPM picked up 12 MPH shock
I ended up trying from 2000 RPM to 2600 RPM in 500 RPM increments, that airplane that day a in those weather at that altitude like 2300 RPM best.
My message is to test before deciding on what will work versus what you may think will or won't work on our toys twocents wrench scope work up
Lots of ways to slow down, not so many on making our cars and other toys faster, test, test and test some more wrench up


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Header thread [Re: HardcoreB] #3064505
08/01/22 09:35 PM
08/01/22 09:35 PM
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Posts: 55
Nebraska
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Nebraska
2.250 tube with 4” collector B1 RB in a Foxbody.

D3BAABC1-5C97-4563-9398-2CFD74847BE6.jpeg704F1C00-0E3C-43CA-855A-4F0DF77AFBFC.jpeg
Re: Header thread [Re: moparx] #3064549
08/02/22 05:19 AM
08/02/22 05:19 AM
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Posts: 6,002
Melbourne , Australia
LA360 Offline
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Originally Posted by moparx
Originally Posted by crackedback
Originally Posted by Cab_Burge
I'm assuming Bullhorns mean the collector pointing up outside the body, correct or not?
I would be temted,if i had set, to try pointing them back towards the rear bumper for additional ET work devil
Greedy I BE whistling grin


Drag from the tube hanging outside the body would likely outstrip any "thrust" from the headers




that's one thing [among others] that makes me not quite understand why bullhorns are used.
beer


Plenty of folk still using them, people have done testing with positive results as well.

https://www.yellowbullet.com/thread...ust-a-fad-or-does-it-really-work.230383/

https://www.dragzine.com/news/upturned-bull-horn-exhaust-just-a-fad-or-does-it-really-work/

Some older articles for your reading


Alan Jones
Re: Header thread [Re: LA360] #3064563
08/02/22 07:36 AM
08/02/22 07:36 AM
Joined: Jan 2003
Posts: 2,625
A shed in England
Tig Offline
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A shed in England
Originally Posted by LA360
Originally Posted by moparx
Originally Posted by crackedback
Originally Posted by Cab_Burge
I'm assuming Bullhorns mean the collector pointing up outside the body, correct or not?
I would be temted,if i had set, to try pointing them back towards the rear bumper for additional ET work devil
Greedy I BE whistling grin


Drag from the tube hanging outside the body would likely outstrip any "thrust" from the headers




that's one thing [among others] that makes me not quite understand why bullhorns are used.
beer


Plenty of folk still using them, people have done testing with positive results as well.

https://www.yellowbullet.com/thread...ust-a-fad-or-does-it-really-work.230383/

https://www.dragzine.com/news/upturned-bull-horn-exhaust-just-a-fad-or-does-it-really-work/

Some older articles for your reading


Wow! educational, thanks ! up


'74 Challenger..9.46 and 145.9 so far. 4023lb!!!# N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @142.4 with our old mule 580 wedge
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
Re: Header thread [Re: Tig] #3064575
08/02/22 08:54 AM
08/02/22 08:54 AM
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Posts: 11,956
Taxes & Virus's R-US, NY
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Mine....old way.....new way...Notice the size difference in the tubes...

DSC04110.JPGDSC06963.JPG
Last edited by Dragula; 08/02/22 08:58 AM.

'70 Cuda,...605 Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown Hemi Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk
Re: Header thread [Re: LA360] #3064667
08/02/22 02:29 PM
08/02/22 02:29 PM
Joined: Sep 2003
Posts: 16,429
north of coder
moparx Offline
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thanks for the links LA ! up
i can finally start to understand this concept.
there is quite a bit of difference between an 11 second car and a 5 [or 4] second one. biggrin
beer

Re: Header thread [Re: LA360] #3067586
08/13/22 11:21 AM
08/13/22 11:21 AM
Joined: Aug 2003
Posts: 4,381
On the parachute mount
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n20mstr Offline
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Finished product

E0913DF6-3C86-41FF-A726-E1631F934D41.jpeg

....BAD A$$ STREET CAR.....
Re: Header thread [Re: LA360] #3067643
08/13/22 02:13 PM
08/13/22 02:13 PM
Joined: Feb 2015
Posts: 1,762
CA
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Originally Posted by LA360
Originally Posted by moparx
Originally Posted by crackedback
Originally Posted by Cab_Burge
I'm assuming Bullhorns mean the collector pointing up outside the body, correct or not?
I would be temted,if i had set, to try pointing them back towards the rear bumper for additional ET work devil
Greedy I BE whistling grin


Drag from the tube hanging outside the body would likely outstrip any "thrust" from the headers




that's one thing [among others] that makes me not quite understand why bullhorns are used.
beer


Plenty of folk still using them, people have done testing with positive results as well.

https://www.yellowbullet.com/thread...ust-a-fad-or-does-it-really-work.230383/

https://www.dragzine.com/news/upturned-bull-horn-exhaust-just-a-fad-or-does-it-really-work/

Some older articles for your reading


Turning them up to help with downforce, sure. It's free weight not subject to a those post race weighing thingies, scales.

Turning them back to the rear to increase speed through additional thrust, I doubt it seriously has a positive effect. Drag vs thrust.

Last edited by crackedback; 08/13/22 02:15 PM.
Re: Header thread [Re: crackedback] #3069343
08/18/22 07:16 PM
08/18/22 07:16 PM
Joined: Jan 2003
Posts: 9,554
Frostbitefalls MN (Rocky&Bullw...
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Frostbitefalls MN (Rocky&Bullw...
One side done, a couple pipes to fix on the other, then wrap that side. Getting close!

PXL_20220818_193530090.jpg

8.77 153 mph best, 3055 lbs 528 indy 440-1 alky
Re: Header thread [Re: gregsdart] #3069441
08/19/22 09:01 AM
08/19/22 09:01 AM
Joined: Sep 2008
Posts: 649
Florida
CJD AUTOMOTIVE Offline
mopar
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Florida
Here is a set I built for my street/road race 'Cuda. It's a turbo car with 345's up front, so packaging is tight.

I'm using the Victor heads, and no one makes a header flange I liked. I bought the Stainless Headers one and figured out it's just a copy of the .dxf file for the gasket. Decided to make my own (right one is the SH flange and left is mine):

[Linked Image]

I had these water jet cut, and the port slug gave me an idea. I reduced the OD about .030", put a radius on the driven edge, and drilled a hole to attach a handle. This became my forming tool for the stubs. I formed the stub on the bench, inserted, and then formed it again in the flange. Worked out pretty good:

[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]

I used the Lego's to layout about 10 different setup's. The goal was all primaries within 1/2" of each other, easy spark plug access, and be removable without pulling the engine! I finally got there, but damn...

[Linked Image]
[Linked Image]
[Linked Image]


The other side was no easier, as I have the engine offset 1-1/2" to the passenger side.


Craig Scholl
CJD Automotive, LLC
Jacksonville, FL
www.CJDAUTOMOTIVE.com
904-400-1802

"I own a Mopar. I already know it won't be in stock, won't ship tomorrow, and won't fit without modification"
Re: Header thread [Re: CJD AUTOMOTIVE] #3069442
08/19/22 09:04 AM
08/19/22 09:04 AM
Joined: Sep 2008
Posts: 649
Florida
CJD AUTOMOTIVE Offline
mopar
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mopar

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Posts: 649
Florida
Couple more, hit the posting limit above.

[Linked Image]
[Linked Image]


Craig Scholl
CJD Automotive, LLC
Jacksonville, FL
www.CJDAUTOMOTIVE.com
904-400-1802

"I own a Mopar. I already know it won't be in stock, won't ship tomorrow, and won't fit without modification"
Re: Header thread [Re: CJD AUTOMOTIVE] #3069448
08/19/22 09:28 AM
08/19/22 09:28 AM
Joined: Jan 2003
Posts: 2,625
A shed in England
Tig Offline
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Originally Posted by CJD AUTOMOTIVE
Couple more, hit the posting limit above.


Wow !! Impressive stuff for sure, any pics of the whole project ?


'74 Challenger..9.46 and 145.9 so far. 4023lb!!!# N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @142.4 with our old mule 580 wedge
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
Re: Header thread [Re: gregsdart] #3069501
08/19/22 11:15 AM
08/19/22 11:15 AM
Joined: Jan 2003
Posts: 16,693
Western NC
440Jim Offline
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Western NC
Originally Posted by gregsdart
One side done, a couple pipes to fix on the other, then wrap that side. Getting close!

Greg,
Good to hear the progress.
What didn't you like about the #1 and #7 tubes?


1993 Daytona, 1973 Cuda 440, 2009 Challenger 5.7 Hemi, 2015 RAM 1500 5.7 Hemi 8-speed auto, Link to 572 B1 - Part 1
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