Will these work?
Thread Starter
Drifting
Joined: Feb 2005
Posts: 1,340
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From: St. Petersburg, Fla.
Will these work?
Got my spark plugs from the Rock in the mail and they came in two packages and look like this...
What's the deal here? Will these still work together?? They are all the same part number.
What's the deal here? Will these still work together?? They are all the same part number.
Last edited by 94flavette; Jul 4, 2013 at 11:24 AM.
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They are different. Why do you even need to ask?
Safety Car
Joined: Apr 2011
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Hmmm...
IIWM, I'd want to install 8 that were alike. The thing I see, is the depth of the plugs reach into the chamber. That matters... There MIGHT only be a .3% difference in the flame path or combustion with a plug that drops 1mm further into the combustion chamber, BUT there is a difference. Besides, I'd be concerned about detonation/pre-ignition problems with more spark plug in the chamber than should be? Who knows which is the correct reach.. Unless one was meant to have a washer/seal and the other is not. That might level the reach of all.
Still, I like symmetry.
IIWM, I'd want to install 8 that were alike. The thing I see, is the depth of the plugs reach into the chamber. That matters... There MIGHT only be a .3% difference in the flame path or combustion with a plug that drops 1mm further into the combustion chamber, BUT there is a difference. Besides, I'd be concerned about detonation/pre-ignition problems with more spark plug in the chamber than should be? Who knows which is the correct reach.. Unless one was meant to have a washer/seal and the other is not. That might level the reach of all.
Still, I like symmetry.
Team Owner
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The spark plug on the left is from ACD when ACD was not just a marketing brand and theoretically quality was controlled more stringently. The tooling for the product on the left was likely that of GM/ACD. The spark plug on the right is the offering from ACD presently and the source is ???
Eight of either is likely fine but I'd think a "mix" not.
Eight of either is likely fine but I'd think a "mix" not.
Last edited by WVZR-1; Jul 4, 2013 at 03:54 AM.
Safety Car
Joined: Aug 2009
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From: Melbourne, Victoria, Australia
Hmmm...
IIWM, I'd want to install 8 that were alike. The thing I see, is the depth of the plugs reach into the chamber. That matters... There MIGHT only be a .3% difference in the flame path or combustion with a plug that drops 1mm further into the combustion chamber, BUT there is a difference. Besides, I'd be concerned about detonation/pre-ignition problems with more spark plug in the chamber than should be? Who knows which is the correct reach.. Unless one was meant to have a washer/seal and the other is not. That might level the reach of all.
Still, I like symmetry.
IIWM, I'd want to install 8 that were alike. The thing I see, is the depth of the plugs reach into the chamber. That matters... There MIGHT only be a .3% difference in the flame path or combustion with a plug that drops 1mm further into the combustion chamber, BUT there is a difference. Besides, I'd be concerned about detonation/pre-ignition problems with more spark plug in the chamber than should be? Who knows which is the correct reach.. Unless one was meant to have a washer/seal and the other is not. That might level the reach of all.
Still, I like symmetry.
The depth of the plugs in the head reaching into the chamber is a real concern, here in Australia Ford have sourced spark plugs locally and the thread was too long. Became a problem at the next service, the carbon build up on the threads made the removal damage the threads of the cylinder heads an expensive repair...
No wonder Ford is pulling out of manufacturing in Australia .....
Hope this spark plug issue doesn't happen to 94Flavette.
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Team Owner
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The depth of the plugs in the head reaching into the chamber is a real concern, here in Australia Ford have sourced spark plugs locally and the thread was too long. Became a problem at the next service, the carbon build up on the threads made the removal damage the threads of the cylinder heads an expensive repair...
No wonder Ford is pulling out of manufacturing in Australia .....
Hope this spark plug issue doesn't happen to 94Flavette.
One might wonder which were the "close outs" - some of the smooth insulator/nickel plated ACD spark plugs seem to have the same thread considerations as those on the left.
Last edited by WVZR-1; Jul 4, 2013 at 05:01 AM.
Instructor
Joined: Apr 2013
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From: Greenville SC
You would have been better off going to O'reilly, Autozone, Napa, or Advance to get the plugs, at least you could have verified they were all the same.
FWIW..... FSM for my 96 calls out AC 41-943 plugs, and I know for a fact that it will missfire with AC 14's installed.
FWIW..... FSM for my 96 calls out AC 41-943 plugs, and I know for a fact that it will missfire with AC 14's installed.
Le Mans Master
Joined: Feb 2005
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From: Clearwater Florida
... Put 'em in ... the AC's on one side ... the AC/Delco's on the other ... then check to see if the car pulls harder on one side more than the other , then get back to us so we'll know which to buy ... 
.............
.............
Thread Starter
Drifting
Joined: Feb 2005
Posts: 1,340
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From: St. Petersburg, Fla.
The spark plug on the left is from ACD when ACD was not just a marketing brand and theoretically quality was controlled more stringently. The tooling for the product on the left was likely that of GM/ACD. The spark plug on the right is the offering from ACD presently and the source is ???
Eight of either is likely fine but I'd think a "mix" not.
Eight of either is likely fine but I'd think a "mix" not.
Team Owner
Joined: Sep 2003
Posts: 25,366
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5614244>19280524>19244465>19158032> are all possibles but the first will be the more likely.
A smaller auto parts store maybe also. A large ACD jobber not very likely.