Re: Header thread
[Re: moparx]
#3063372
07/28/22 04:55 PM
07/28/22 04:55 PM
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Joined: Aug 2003
Posts: 4,673 On the parachute mount
n20mstr
master
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master
Joined: Aug 2003
Posts: 4,673
On the parachute mount
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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. 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.....
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Re: Header thread
[Re: n20mstr]
#3063604
07/29/22 12:45 PM
07/29/22 12:45 PM
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Joined: Sep 2003
Posts: 19,336 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,336
north of coder
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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. 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 !
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Re: Header thread
[Re: moparx]
#3064111
07/31/22 04:24 PM
07/31/22 04:24 PM
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Joined: Aug 2003
Posts: 43,116 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,116
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 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 Slowing the prop speed down from 2400 RPM to 2300 RPM picked up 12 MPH 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 Lots of ways to slow down, not so many on making our cars and other toys faster, test, test and test some more
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Header thread
[Re: LA360]
#3064563
08/02/22 07:36 AM
08/02/22 07:36 AM
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Joined: Jan 2003
Posts: 2,915 A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,915
A shed in England
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Wow! educational, thanks !
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 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 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Header thread
[Re: LA360]
#3067643
08/13/22 02:13 PM
08/13/22 02:13 PM
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Joined: Feb 2015
Posts: 2,070 CA
crackedback
top fuel
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top fuel
Joined: Feb 2015
Posts: 2,070
CA
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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.
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Re: Header thread
[Re: gregsdart]
#3069441
08/19/22 09:01 AM
08/19/22 09:01 AM
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Joined: Sep 2008
Posts: 656 Florida
CJD AUTOMOTIVE
mopar
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mopar
Joined: Sep 2008
Posts: 656
Florida
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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): 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: 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... 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.com904-400-1802 "I own a Mopar. I already know it won't be in stock, won't ship tomorrow, and won't fit without modification"
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Re: Header thread
[Re: CJD AUTOMOTIVE]
#3069442
08/19/22 09:04 AM
08/19/22 09:04 AM
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Joined: Sep 2008
Posts: 656 Florida
CJD AUTOMOTIVE
mopar
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mopar
Joined: Sep 2008
Posts: 656
Florida
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Couple more, hit the posting limit above.
Craig Scholl CJD Automotive, LLC Jacksonville, FL www.CJDAUTOMOTIVE.com904-400-1802 "I own a Mopar. I already know it won't be in stock, won't ship tomorrow, and won't fit without modification"
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Re: Header thread
[Re: CJD AUTOMOTIVE]
#3069448
08/19/22 09:28 AM
08/19/22 09:28 AM
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Joined: Jan 2003
Posts: 2,915 A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,915
A shed in England
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Couple more, hit the posting limit above. Wow !! Impressive stuff for sure, any pics of the whole project ?
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 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 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Header thread
[Re: gregsdart]
#3069501
08/19/22 11:15 AM
08/19/22 11:15 AM
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Joined: Jan 2003
Posts: 16,923 NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,923
NC
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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?
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