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Re: Spark Plug Gap
[Re: Going Commando]
#655873
03/30/10 03:27 PM
03/30/10 03:27 PM
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Joined: Oct 2004
Posts: 8,165
Left Coast
BobR
master
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master
Joined: Oct 2004
Posts: 8,165
Left Coast
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Quote:
How much should a guy have with a digital 6 MSD? I am running champion RJ12YC, Iron headed 440, 9.5 to one comp. I currently run 40 thou. gap, pump gas, street driven.
No benefit going wider IMO. That where I run my naturally aspirated stuff with a 7al.
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Re: Spark Plug Gap
[Re: BobR]
#655874
03/30/10 03:38 PM
03/30/10 03:38 PM
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Joined: Aug 2003
Posts: 43,237
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,237
Bend,OR USA
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A wider gap will help, I have found on some, help a cold nature car idle better and start someteimes  The wider the gap the bigger the spark in the combustion chamber  I use tu run .090 in my Hemi stocker with a MSD 404B Idle good, rev good with that box  I ended up going back down to .060 on that car for no real improvement or loss in performance
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Spark Plug Gap
[Re: Cab_Burge]
#655875
03/30/10 04:05 PM
03/30/10 04:05 PM
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Joined: Oct 2004
Posts: 8,165
Left Coast
BobR
master
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master
Joined: Oct 2004
Posts: 8,165
Left Coast
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Quote:
A wider gap will help, I have found on some, help a cold nature car idle better and start someteimes The wider the gap the bigger the spark in the combustion chamber I use tu run .090 in my Hemi stocker with a MSD 404B Idle good, rev good with that box I ended up going back down to .060 on that car for no real improvement or loss in performance
When I ran my E/SA 340 Duster I put a 7AL on and increased the gap from .040 to .060 hoping for some power gain. This resulted in a power loss as the car slowed almost 2 MPH. Regapped the plugs and ran 1/2 hour later and picked it all back up. Then I installed a new set of plugs gapped at .060. Lost 2 MPH. Regapped. Picked it back up. I know that every combo is different but that's my wide gap experience.
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Re: Spark Plug Gap
[Re: Going Commando]
#655877
03/30/10 04:21 PM
03/30/10 04:21 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Thanks guys, I think I'll try 45 thou. and see how it runs 
I have been gapping mine at .040 for years with a 7AL
but I just gapped them to .045 and will try that
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Post deleted by Defbob
[Re: MR_P_BODY]
#655878
03/30/10 04:32 PM
03/30/10 04:32 PM
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Anonymous
Unregistered
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Anonymous
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Re: Spark Plug Gap
[Re: emarine01]
#655880
03/30/10 05:05 PM
03/30/10 05:05 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
 I fooled with gap long enough to just install them right outa the box, I only gap the ones I drop 
I dont know if it helps or not... but the plugs come
gapped at .035 but I open them to .040 but just to do
something different this year I'll try them at .045,
probably wont make a difference at all.... hell I dont
even change plugs very often... this set has been in
there, this will be the third year(2nd year really
cause I didnt race last year)
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Re: Spark Plug Gap
[Re: MR_P_BODY]
#655881
03/30/10 05:31 PM
03/30/10 05:31 PM
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Joined: Mar 2003
Posts: 15,491
the boonies
aarcuda
I Live Here
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I Live Here
Joined: Mar 2003
Posts: 15,491
the boonies
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i gap at .040 too. Mallory Hyfire IV ignition
It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspensions, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas.
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Re: Spark Plug Gap
#655883
03/30/10 07:34 PM
03/30/10 07:34 PM
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Joined: Oct 2004
Posts: 8,165
Left Coast
BobR
master
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master
Joined: Oct 2004
Posts: 8,165
Left Coast
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Quote:
the last time I gapped a plug is when I had a full head of hair. never saw a change with modern ignitions.
open box, see plug gap not closed, install plug 
With nitrous or forced air you have to close the gap considerably. We tried .020 on our Procharged deal and it dropped cylinders. We ended up at .017 with our Digital 7 ignition. We now have that piggy backed with an MSD 8 with the turbos but are hesitant to open them up any more.
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Re: Spark Plug Gap
[Re: BobR]
#655884
03/30/10 07:47 PM
03/30/10 07:47 PM
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Joined: Oct 2005
Posts: 28
WI.
4Huntin
member
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member
Joined: Oct 2005
Posts: 28
WI.
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Iron headed 446, Hyd cam, 10.5-1 pump gas. 410 83/4 727 10.56 at 127 best time. Plugs gapped at 50 new msd 6al-2 says up to 60 I will try it. Steve 
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Post deleted by Defbob
[Re: BobR]
#655885
03/30/10 07:48 PM
03/30/10 07:48 PM
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Anonymous
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Anonymous
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Re: Spark Plug Gap
[Re: QuickBpBp]
#655888
03/30/10 08:09 PM
03/30/10 08:09 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
So then what would be a good gap for a street driven 11 to 1 440 with a 200 shot?? Msd 6AL box. If I drive to the track I don't wanna mess with changing plugs on a hot motor for spray/no spray...keep it at 35 or tighten it up?
The guys that I know that run a 200 shot are right
in the .028 to .030 range... I'm just going by what
they say... I dont spray
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Re: Spark Plug Gap
[Re: MR_P_BODY]
#655889
03/30/10 08:13 PM
03/30/10 08:13 PM
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Joined: Jul 2003
Posts: 6,343
SE PA.
QuickBpBp
master
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master
Joined: Jul 2003
Posts: 6,343
SE PA.
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Quote:
Quote:
So then what would be a good gap for a street driven 11 to 1 440 with a 200 shot?? Msd 6AL box. If I drive to the track I don't wanna mess with changing plugs on a hot motor for spray/no spray...keep it at 35 or tighten it up?
The guys that I know that run a 200 shot are right
in the .028 to .030 range... I'm just going by what
they say... I dont spray
Thanks. I'll set them @ 30 as I am putting my car back together after 13 years of having it sit in boxes.....
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Post deleted by Defbob
[Re: MR_P_BODY]
#655890
03/30/10 08:18 PM
03/30/10 08:18 PM
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Anonymous
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