spark plug analysis..
Thread Starter
Race Director
Joined: Apr 2003
Posts: 19,344
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From: Tampa, Florida
spark plug analysis..
#2, 4 and 6
These were installed at the begiing of my tuning so they need to be replaced.
They are Champion RJ12YC which is what book called for.
Cross referencing them I come up with all kinds of plugs that haven't been mentioned on the forum
AC R44's cross reference with Champion RJ8C and NGK B26S and B6S. It seems the RJ12YC is 4 steps hotter than AC R44.
Regardless, how do the plugs look? (besides fouled)
Thanks,
Jim
These were installed at the begiing of my tuning so they need to be replaced.
They are Champion RJ12YC which is what book called for.
Cross referencing them I come up with all kinds of plugs that haven't been mentioned on the forum
AC R44's cross reference with Champion RJ8C and NGK B26S and B6S. It seems the RJ12YC is 4 steps hotter than AC R44.
Regardless, how do the plugs look? (besides fouled)
Thanks,
Jim
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From: Wellington, FL
St. Jude Donor '11 thru '25
It looks like you are burning very rich as indicated by the black carbon. Do you generally take the car on very short trips? This will do it and is very hard on the engine. 
Thread Starter
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From: Tampa, Florida
Racer
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From: macks creek mo
Put new plugs in and take it out and put your foot in it Corvettes or made to get out and run. I have a 69-350-350hp and I needed plugs so I went to autozone and the kit behind the counter looked at the plug and said is this for a tractor---GO FIGURE
Race Director
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From: Taylor Michigan
The 12 is very close to a 45, the 10 would be close to a 44 and the 8 is really colder than a 43.
Your plugs look fuel fouled. various reasons for that. A few degrees advance may help it. The idle may come up, but just close the butterfly's a taste to lower it.
Your plugs look fuel fouled. various reasons for that. A few degrees advance may help it. The idle may come up, but just close the butterfly's a taste to lower it.
Drifting
Joined: Nov 2007
Posts: 1,683
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From: New York
This is just my experience, but I have never been wild about Champion spark plugs. I would install a set and run the car in a time trial. They were good for maybe another week or less before the car would start to break up.
NGK’s plugs used seemed to work better for me. I would be interested to hear what others have to say about plug brand preference.
NGK’s plugs used seemed to work better for me. I would be interested to hear what others have to say about plug brand preference.
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Thread Starter
Race Director
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From: Tampa, Florida
It doesnt stay running if I dont...
I leaned it out a touch...
I have my '06 GTO for that...
I leaned it out a touch and put AC R45's in. 43's and 44's arent available in my area (if at all). I'll recheck my timing to see if I can put a little more advance in. I know its advanced beyond what the book calls for already.
I leaned it out a touch and put AC R45's in. 43's and 44's arent available in my area (if at all). I'll recheck my timing to see if I can put a little more advance in. I know its advanced beyond what the book calls for already.
Last edited by jim2527; Feb 22, 2008 at 03:32 PM.
Thread Starter
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From: Tampa, Florida
Advanced
Joined: Jun 2006
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From: Chehalis Wa
This is just my experience, but I have never been wild about Champion spark plugs. I would install a set and run the car in a time trial. They were good for maybe another week or less before the car would start to break up.
NGK’s plugs used seemed to work better for me. I would be interested to hear what others have to say about plug brand preference.
NGK’s plugs used seemed to work better for me. I would be interested to hear what others have to say about plug brand preference.
100%
Drifting
Joined: Nov 2007
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From: New York
