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These plugs too cold?
#2517774
07/05/18 12:44 AM
07/05/18 12:44 AM
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Joined: Jan 2007
Posts: 8,033
Mt Morris Michigan
mopar dave
OP
master
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OP
master
Joined: Jan 2007
Posts: 8,033
Mt Morris Michigan
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Pulled from the 511 after a 60 mile trip to a car show. Mostly 3000rpm cruise. About 200 street miles on NGK 8's. Darkest plug is #7.
Last edited by mopar dave; 07/05/18 12:45 AM.
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Re: These plugs too cold?
[Re: mopar dave]
#2517781
07/05/18 01:30 AM
07/05/18 01:30 AM
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Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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They look cold and rich but I don't really like reading NGK plugs.
Looks rich at cruise. Can't see WOT.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: These plugs too cold?
[Re: mopar dave]
#2517786
07/05/18 01:52 AM
07/05/18 01:52 AM
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Joined: Dec 2007
Posts: 12,587
Great Neck,LI,new york
hemi-itis
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 12,587
Great Neck,LI,new york
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Unless you turn off the key while at full throttled and load at the top of at least 2nd gear,all you see on the plug is Idle.Dial in the timing 1st than fine tune the carb.
HEMI-ITIS has no cure.
My condition is fully BLOWN!!
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Re: These plugs too cold?
[Re: mopar dave]
#2517849
07/05/18 09:56 AM
07/05/18 09:56 AM
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Joined: May 2009
Posts: 511
Temperance, MI
68 HEMI GTS
mopar
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mopar
Joined: May 2009
Posts: 511
Temperance, MI
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8 is a cold plug unless you have some compression. If it’s a pump gas street motor you should atleast be running a 7 if not a 6. I run 6’s in my 10.5:1 511.
68 Dart GTS "HEMI" 10.30 @ 131 pump gas street car 3780#
69 Roadrunner 511 six pack 10.92 drive to track street car
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Re: These plugs too cold?
[Re: Cab_Burge]
#2517850
07/05/18 09:56 AM
07/05/18 09:56 AM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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unless you can blast the plugs to clean em you might just change one plug (to the right heat range) tho the heat range may or may not be right as is right now, so you dont end up with multiple sets of fouled plugs till you get it taken care of. I'm thinking carb issue.
live every 24 hour block of time like it's your last day on earth
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Re: These plugs too cold?
[Re: RapidRobert]
#2517852
07/05/18 10:07 AM
07/05/18 10:07 AM
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Joined: Jan 2007
Posts: 8,033
Mt Morris Michigan
mopar dave
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OP
master
Joined: Jan 2007
Posts: 8,033
Mt Morris Michigan
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Ok, i'll step this up to 7's. The 8's stayed clean for a long time until i took a longer trip. One at a time is a good idea. Thanks
Last edited by mopar dave; 07/05/18 10:11 AM.
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Re: These plugs too cold?
[Re: mopar dave]
#2517872
07/05/18 11:10 AM
07/05/18 11:10 AM
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Joined: Jun 2008
Posts: 3,916
usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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Still have that one cylinder #7 that runs darker than the rest of the plugs while #5 burns the cleanest. #7 must be robbing fuel from #5 looks to me. I have done a bunch of reading on how to read plugs and no one says to look at porcilain burn color for mixture settings. The ring at the thread base is read for mixture and mine look pretty clean for the most part. No carbon build up there. Maybe #7 plug, but the rest look fair for a too cold of plug. What does porcilean color accually tell you besides if you have detonation or not? I will pick up some 7's and 6' and go from there. Thanks you may have fuel distribution issue with the intake manifold. single plane intake?
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Re: These plugs too cold?
[Re: mopar dave]
#2517970
07/05/18 02:41 PM
07/05/18 02:41 PM
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Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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Take the 4 hole spacer off and see if it fixes the distribution issues.
Also, you don't have to clean cut the engine unless you are tuning for WOT. Even then, if the rest of the tune up is correct you can drive it back to the pits and still read them.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: These plugs too cold?
[Re: mopar dave]
#2518395
07/06/18 01:32 PM
07/06/18 01:32 PM
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Joined: Mar 2007
Posts: 3,277
West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,277
West Coast, USA
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Hard to see the plug threads to count the number of threads the color change occurs at. From what I've read, it looks like its happening at the 3rd thread down from the tip, which should be ideal heat range wise.
As far as tuning for A/F mixture, buy and install a wide band and take the guess work out of it. Best tuning tool ever invented in my book.
Last edited by jbc426; 07/06/18 01:34 PM.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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