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Re: Dual plug reasoning?
[Re: DemonDust]
#2835985
10/22/20 09:33 AM
10/22/20 09:33 AM
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Joined: Apr 2003
Posts: 3,508
Tulsa, Oklahoma
340Cuda
master
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master
Joined: Apr 2003
Posts: 3,508
Tulsa, Oklahoma
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There are several big power turbo builds running 1000+ hp using one plug. Don't some of the heads up series add extra weight on 16 plug engines?
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Re: Dual plug reasoning?
[Re: Medlock51]
#2839257
10/30/20 12:33 PM
10/30/20 12:33 PM
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Joined: Dec 2015
Posts: 112
Michigan
ghinmi
member
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member
Joined: Dec 2015
Posts: 112
Michigan
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One plug fires 20 degrees btdc...the second fires 5 degrees atdc to clean up the nox emissions. This is incorrect. They fire at the same time.
1975 Jeep Cherokee compound turbo 5.7 Hemi/6 speed AutoX/Drag/Street.
9.97 @ 140 slicks, 10.74 in autox trim
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Re: Dual plug reasoning?
[Re: Medlock51]
#2845327
11/12/20 01:43 PM
11/12/20 01:43 PM
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Joined: Feb 2003
Posts: 1,306
Laveen, Arizona
GTSDart340
pro stock
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pro stock
Joined: Feb 2003
Posts: 1,306
Laveen, Arizona
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One plug fires 20 degrees btdc...the second fires 5 degrees atdc to clean up the nox emissions. Why would two plugs be needed for that? Just fire the same plug twice.
1949 International KB-2 "Mater" - 302/T5
1968 Dodge Dart GTS "The Drat" - 340/727
2006 Dodge Magnum R/T - Hemi
2016 Dodge Durango Limited - 3.6
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Re: Dual plug reasoning?
[Re: GTSDart340]
#2853240
11/30/20 09:19 AM
11/30/20 09:19 AM
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Joined: Jan 2011
Posts: 4,785
Utah and Alaska
astjp2
master
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master
Joined: Jan 2011
Posts: 4,785
Utah and Alaska
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One plug fires 20 degrees btdc...the second fires 5 degrees atdc to clean up the nox emissions. Why would two plugs be needed for that? Just fire the same plug twice. dwell time is too short
1941 Taylorcraft
1968 Charger
1994 Wrangler
1998 Wrangler
2008 Kia Rio
2017 Jetta
I didn't do 4 years and 9 months of Graduate School to be called Mister!
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Re: Dual plug reasoning?
[Re: 340Cuda]
#2853369
11/30/20 02:39 PM
11/30/20 02:39 PM
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Joined: May 2005
Posts: 54
VA Beach, VA
Runnoft
member
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member
Joined: May 2005
Posts: 54
VA Beach, VA
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There are several big power turbo builds running 1000+ hp using one plug. Don't some of the heads up series add extra weight on 16 plug engines? The class I race in adds 50lbs to dual plug applications. There are two or three people in the class running a 3rd gen Hemi and they claim it's unfair and would run the same with one plug BUT they haven't tried it yet. I would bet it changes their tuneup -both fuel and timing - and I'm betting power changes too. Just FYI, these are >2000hp engines on methanol.
Cruiser: 66 Dodge Coronet 500, Indy SR 440, Gen 7 Accel EFI = 11.38 @ 116.
Racing: Brand X, X275 Procharged Smallblock on M1, Leafsprings, Holley EFI = 4.30 @ 168
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Re: Dual plug reasoning?
[Re: bobby66]
#2861289
12/17/20 01:30 PM
12/17/20 01:30 PM
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Joined: Jan 2003
Posts: 6,017
Morningside
AdventurerSport
waaaay out there in left field
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waaaay out there in left field
Joined: Jan 2003
Posts: 6,017
Morningside
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Ive seen those, big RB Hemi's with dual distributors, dual plugs.
of course, I've also seen that on other applications, including a 1991 Ford Ranger 2.3L, which had two distributors and two plugs per cylinder on it's 4 cyl engine. Pretty sure that was for emissions, kinda like the new 5.7L Hemi...:)
JS
76 Dodge Adventurer Sport Power Wagon W100 318, 727, NP203 Fulltime 4x4 Russet Red
06 Jeep Commander Ltd 4x4, 5.7L Hemi, QuadraDrive II
06 Chrysler 300C AWD 5.7L Hemi
10 Mopar 10 Challenger R/T, #483/500, 5.7L HEMI
10 Jeep Grand Cherokee Ltd 4x4 5.7L HEMI
11 Dodge Ram 1500 LoneStar Quad Cab, 5.7L HEMI, Fulltime 4x4, Deep Cherry Red
16 Jeep Cherokee Limited 3.2L Pentastar V6, 9 Speed Torqueflite, 4x4, Black
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