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DO YOU REALLY NEED COLLECTORS #2767973
04/24/20 10:44 PM
04/24/20 10:44 PM
Joined: Oct 2008
Posts: 1,176
East Coast
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A/MP Offline OP
super stock
A/MP  Offline OP
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East Coast
I'm looking at a '65 Dart BB track car build. I've received pics from several people that have done this swap and fabricated header for this combo. Not one has easy access to the plugs and most have some type of front tire rub went turning. The car has great rust patina and I'm thinking of removing the outer an inner fenders and running some cage outriggers to the front frame. I'd solve a lot of plumbing issues by fab'in some zoomie style headers. The motor will be a 440 with about 600HP. Any tuning issues or substantial lost of power with out collectors?

Re: DO YOU REALLY NEED COLLECTORS [Re: A/MP] #2767975
04/24/20 10:46 PM
04/24/20 10:46 PM
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Oregon
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AndyF Offline
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It will lose some power but does it really matter?

Re: DO YOU REALLY NEED COLLECTORS [Re: AndyF] #2768011
04/25/20 04:01 AM
04/25/20 04:01 AM
Joined: Dec 2006
Posts: 4,647
aotearoa
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aotearoa
I made my own headers, mostly for ease of access to the plugs& quick escape from the car. The 5" collector isnt much more than a joining point for the primaries, but it sounds good.

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Re: DO YOU REALLY NEED COLLECTORS [Re: A/MP] #2768107
04/25/20 12:49 PM
04/25/20 12:49 PM
Joined: Aug 2003
Posts: 1,310
Charlotte, NC
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LSP Offline
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Charlotte, NC
Originally Posted by A/MP
I'm looking at a '65 Dart BB track car build. I've received pics from several people that have done this swap and fabricated header for this combo. Not one has easy access to the plugs and most have some type of front tire rub went turning. The car has great rust patina and I'm thinking of removing the outer an inner fenders and running some cage outriggers to the front frame. I'd solve a lot of plumbing issues by fab'in some zoomie style headers. The motor will be a 440 with about 600HP. Any tuning issues or substantial lost of power with out collectors?


Yes it will lose power, but the higher your VE is, the less collector you'll need.

Re: DO YOU REALLY NEED COLLECTORS [Re: A/MP] #2768126
04/25/20 01:40 PM
04/25/20 01:40 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
Originally Posted by A/MP
The motor will be a 440 with about 600HP. Any tuning issues or substantial lost of power with out collectors?
You will loose power on any N/A motor with no collectors, how much and how bad will it affect the car I have no idea. I do know that getting the collector length correct can help a mid 11 second car pickup .18 ET lower and a little over 2.0 MPH gain work
I have a 1965 Dart also that will have a big C.I.(555) B1 motor in it to try and run Top Sport man N/A luck
It will have 2 1/8 to 2 1/4 step headers with 4.0 inch merged collectors on it wrench


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: DO YOU REALLY NEED COLLECTORS [Re: AndyF] #2768132
04/25/20 01:50 PM
04/25/20 01:50 PM
Joined: Jan 2003
Posts: 14,479
So. Burlington, Vt.
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fast68plymouth Offline
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Originally Posted by AndyF
It will lose some power but does it really matter?


Exactly.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: DO YOU REALLY NEED COLLECTORS [Re: fast68plymouth] #2768200
04/25/20 06:09 PM
04/25/20 06:09 PM
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Posts: 30,947
Oregon
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AndyF Offline
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Oregon
Originally Posted by fast68plymouth
Originally Posted by AndyF
It will lose some power but does it really matter?


Exactly.


It will also sound weird but once again, does it really matter? I used to go to the track with some circle track guys and there was one car there that had weed burner zoomie type exhaust pipes. That car sounded horrible and always ran in the middle of the pack. Never knew what his deal was but I guess he liked his zoomie headers. I hated them but sometimes you have to do what you have to do.

Re: DO YOU REALLY NEED COLLECTORS [Re: AndyF] #2768216
04/25/20 06:37 PM
04/25/20 06:37 PM
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Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
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Zoomies are LOUD! An option is build fenderwells but create a box at the back of the wheelwell for the tubes and collecter. Worked well for me. You also wind up with a "step" to wrest your left foot on.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: DO YOU REALLY NEED COLLECTORS [Re: A/MP] #2768248
04/25/20 08:13 PM
04/25/20 08:13 PM
Joined: Oct 2007
Posts: 4,205
New York
polyspheric Offline
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A benefit for zoomies: no need for those oh-so-tight radius bends to make the primary lengths leading to the collector equal. If you have the room: straight out at the port angle as far as possible before making any turn. Harley factory racing pipe for Sportsters: 8" radius from the port.
Famous story: it's 1962. Mickey Thompson is watching as tuners install and modify conventional headers (Pontiac?) on a dyno stand, with minor and confusing results ("it's not supposed to do that!").
He heated up all 4 primaries on each side 4" away from the flange, and bent the entire system out away from the engine (sideways) and it picked up 50 hp. So much for "exhaust theory".

Zoomies are also far easier to change the length, and why do they need to be the same?


Boffin Emeritus
Re: DO YOU REALLY NEED COLLECTORS [Re: polyspheric] #2768268
04/25/20 09:05 PM
04/25/20 09:05 PM
Joined: Jan 2011
Posts: 667
st.louis,mo.
dart games Offline
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st.louis,mo.
i built my fender exit headers with only a hacksaw and mig welder,2 1/8 tubes,4 exit,i was getting tired of fumes coming up inside and fender exit looks cool anyway

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Re: DO YOU REALLY NEED COLLECTORS [Re: gregsdart] #2768325
04/26/20 06:45 AM
04/26/20 06:45 AM
Joined: Jan 2003
Posts: 2,902
A shed in England
Tig Offline
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A shed in England
Originally Posted by gregsdart
Zoomies are LOUD! An option is build fenderwells but create a box at the back of the wheelwell for the tubes and collecter. Worked well for me. You also wind up with a "step" to wrest your left foot on.

To the human ear they are but they will pass sound check easier than a collector as the directional mic used in these tests only seems to pic up one or maybe 2 of the pipes. Where as with a collector...well you get the picture. We have a 120db limit for 9.00 and slower vehicles here in the UK for sanctioned events BTW.


'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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