Re: Collector Size
[Re: DusterKid]
#3077201
09/14/22 12:12 PM
09/14/22 12:12 PM
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Joined: Aug 2003
Posts: 43,204 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,204
Bend,OR USA
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Last edited by Cab_Burge; 09/14/22 12:14 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Collector Size
[Re: Cab_Burge]
#3077376
09/14/22 11:49 PM
09/14/22 11:49 PM
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Joined: Apr 2005
Posts: 1,505 TN
SCATPACK 1
pro stock
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pro stock
Joined: Apr 2005
Posts: 1,505
TN
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I agree w Cab on the tube size. Also on the collector, start with at least18 inches in length and shorten from there if you need to.
Old Geezer Racing
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Re: Collector Size
[Re: SCATPACK 1]
#3077414
09/15/22 08:33 AM
09/15/22 08:33 AM
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Joined: Oct 2007
Posts: 2,808 Wisconsin
wkroncke17
master
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master
Joined: Oct 2007
Posts: 2,808
Wisconsin
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I agree w Cab on the tube size. Also on the collector, start with at least18 inches in length and shorten from there if you need to. I was told by my father and his buddies who raced S/S back in the 60's to start with a Longer (24"?) Collector - paint it a light cheap black color and after 5-6 runs the paint will burn off to where we should cut them off. Does anyone still use this theory? I happen to have a new set waiting to use on my Demon that I just (lightly) painted. Not trying to hijack - just asking to hopefully help. Thanks to the OP for this post!! Wally.
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Re: Collector Size
[Re: wkroncke17]
#3077421
09/15/22 09:02 AM
09/15/22 09:02 AM
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Joined: Mar 2003
Posts: 2,509 PA
moparacer
master
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master
Joined: Mar 2003
Posts: 2,509
PA
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I would run 3 1/2 if it were me....1 7/8 is kind of on the border line though. Anything smaller I would run the 3 inch.
67 Barracuda street/bracket car 11.27-119 68 Dart 502 BB 8.70s-152 414 cid SB Dragster 7.65-174
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Re: Collector Size
[Re: moparacer]
#3077461
09/15/22 10:42 AM
09/15/22 10:42 AM
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Joined: Dec 2021
Posts: 1,131 Loudoun County, VA
Brad_Haak
super stock
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super stock
Joined: Dec 2021
Posts: 1,131
Loudoun County, VA
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Somewhere I have my Headers by Ed design documents that go into details on tube sizes, collector size ratios vs tube size, etc.
What I recall is based on Ed's formula, a 1-7/8" with a 3.0" collector is pretty much right in the middle of his acceptable range; a 3.5" is pretty big for that tube size, unless you're turning a lot of RPM and/or narrow RPM range (stick car vs auto).
With 2" tubes, a 3.5" is also pretty much right in the middle of his acceptable range. I've only seen one prod header that I remember 2" tubes and 3.0" collector, and that was a Hedman Header model which I never considered.
A 3.0" for a 2" tube is definitely on the small side, although in a merge collector it could taper down to 3.0" before expanding back to 3.5". But everything I've heard says you should design that from the start, not just slap a merge collector on a header not designed for one... even though I see that's what a number of header companies do now cuz it's simpler that way.
2021 Challenger 6.4L Scat Pack 1320 100% stock: 1.680, 11.894 at 113.75 (DA 175 ft) weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)
1973 Challenger 452 ci street/strip [2008] pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)
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Re: Collector Size
[Re: DusterKid]
#3077502
09/15/22 12:54 PM
09/15/22 12:54 PM
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Joined: Jan 2003
Posts: 4,050 Shelby Twp. Mi
HardcoreB
master
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master
Joined: Jan 2003
Posts: 4,050
Shelby Twp. Mi
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I'm going to be building my own set of fenderwell headers with 1 7/8 primary tubes should I use a 3 or 3 1/2" collector? Race only engine, Big block 440 see's 6500 rpm max, est 525-550 engine HP. Respectfully, I wouldn't build fenderwell headers until you NEED to poke them out the fender. e.g.- OVER 1000HP Plenty of room to accommodate 2" or larger in a b eng a-body and do it clean and 'correct'. Also, if you're building custom just use 2" x 3.5" IMO OR BUY the TTI. While I dont like them, they seem to work pretty OK!
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Re: Collector Size
[Re: HardcoreB]
#3077534
09/15/22 02:13 PM
09/15/22 02:13 PM
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Joined: Jan 2005
Posts: 1,774 Keymar, MD
DusterKid
OP
top fuel
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OP
top fuel
Joined: Jan 2005
Posts: 1,774
Keymar, MD
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Car had 2" hooker fenderwell on it for years. We than added snout bars and for whatever reason the way we did it interfered with the headers, but at the same time I bought a set of TTI 2" headers as I wanted to run a larger front tires after years of red lighting. Used them for a good many years, but absolutely HATED working on the car with them. Yes they fit great once on, but man they were miserable especially the trans bell bolts. I ended up putting TTI 1 3/4" headers on the car as I had them and was over working with the 2" ones. Used them for a few years but felt they were a little small for my engine, so I modified the old Hooker 2" fenderwells so they would clear the snout bars. I did the swap over the winter but didn't change anything else in the process. Comparing time slips for the 1 3/4" TTI vs Hooker 2" it seems the 60fts are the same, but MPH may actually been slightly better with the TTIs. The TTI's did have a 18" glasspack muffler vs the Hooker 6" Schoenfeld Race Mufflers. I ran each for atleast 2 seasons, so have a decent data base to compare to, but didn't make a ton of passes (only made about 30 this year). I'm to the point that I don't want to mess with underchassis headers as I've been spoiled by the ease of fenderwell headers, but also I'm tired of my front tires rubbing. The header flanges have been welded up and need replaced on the hooker as they are about 25 years old.
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Re: Collector Size
[Re: DusterKid]
#3077562
09/15/22 04:03 PM
09/15/22 04:03 PM
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Joined: Sep 2007
Posts: 145 NJ
cb1289
member
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member
Joined: Sep 2007
Posts: 145
NJ
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In the late 70s we ran a 413 stocker with 2 inch adjustable hookers and 3.5 collectors.One weekend we substituted 3 inch Stahl collectors just because we had them and were curious. The results were stunning. Can't remember exactly how much better but we never went back. Of course the craftsmanship was much better in the Stahl collectors. The collectors on my current motor are junk compared to those old Stahl pieces so I will only suggest you look for guality as well as size in today's parts market
62 Dodge Dart Wagon
65 Plymouth Satellite
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