Wrong Spark Plugs in 5.7 HEMI? - Chrysler 300C Forum: 300C & SRT8 Forums
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post #1 of 44 (permalink) Old 08-20-2006, 01:33 AM Thread Starter
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Wrong Spark Plugs in 5.7 HEMI?

I am about to change the 16 plugs on the 300C. It is way overdue - car has 42k Miles but still starts and runs like new. I can not see a difference in performance between the 300C with 42k miles and overdue tune-up or Magnum R/T with only 9k miles.

Back to topic. The plugs in the 5.7 are regular cheaper Champion copper type but every auto parts store I visited states the car requires a platinum plug? WTF?! I wonder how many people are putting in the wrong plug based on wrong data from all these auto parts stores? The platinum plugs was the only style plug listed for the 5.7 at:

Advanced Auto
Auto Zone
Pep Boys

Advanced Auto was the only store listed above that carries Champion. I ended up buying the Champion plugs by using their part numbers at NAPA. I did not ask NAPA to look up the plugs for 5.7. I wonder if NAPA would also be incorrect. There is also a NGK copper plug that fits.


Last edited by E55 KEV; 08-20-2006 at 01:39 AM.
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post #2 of 44 (permalink) Old 08-20-2006, 07:21 AM
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I went through this same issue when I changed my plugs. But IMO plugs are plugs when it comes to making an engine go around and platinum will have longevity over the copper (Consistent gap over the long haul). Therefore I purchased Champion platinum plugs (#3570, single electrode) at O'Rielly for $0.50 more than copper. I checked and set the gaps to factory specs and the engine idles a lot smoother now. Also checked the gaps on the plugs I removed and found the ones with a larger heat affected zone on the center insulator had the largest gaps. Don't know if that means anything.

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post #3 of 44 (permalink) Old 08-20-2006, 08:41 AM
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Question

Quote:
Originally Posted by Percepty
I went through this same issue when I changed my plugs. But IMO plugs are plugs when it comes to making an engine go around and platinum will have longevity over the copper (Consistent gap over the long haul). Therefore I purchased Champion platinum plugs (#3570, single electrode) at O'Rielly for $0.50 more than copper. I checked and set the gaps to factory specs and the engine idles a lot smoother now. Also checked the gaps on the plugs I removed and found the ones with a larger heat affected zone on the center insulator had the largest gaps. Don't know if that means anything.
I too plan on using platinum plugs for the consistent wear ($8 more for my $40,000 baby keeps me happy). Can you explain "larger heat affected zone"? I'm guessing you referring to MDS and the plugs which fire all the time vs. those which get a break when MDS is active?

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post #4 of 44 (permalink) Old 08-20-2006, 10:16 AM
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Quote:
Originally Posted by E55 KEV
I am about to change the 16 plugs on the 300C. It is way overdue - car has 42k Miles but still starts and runs like new. I can not see a difference in performance between the 300C with 42k miles and overdue tune-up or Magnum R/T with only 9k miles.

Back to topic. The plugs in the 5.7 are regular cheaper Champion copper type but every auto parts store I visited states the car requires a platinum plug? WTF?! I wonder how many people are putting in the wrong plug based on wrong data from all these auto parts stores? The platinum plugs was the only style plug listed for the 5.7 at:

Advanced Auto
Auto Zone
Pep Boys

Advanced Auto was the only store listed above that carries Champion. I ended up buying the Champion plugs by using their part numbers at NAPA. I did not ask NAPA to look up the plugs for 5.7. I wonder if NAPA would also be incorrect. There is also a NGK copper plug that fits.

The problem is these stores are using their own computer cataloging rather than the actual catalog from the spark plug manufactuers; many of these mass merchandiser stores don't even maintain printed catalogs nor do they have personel trained to use them.

I work at a NAPA store and our electronic cataloging does list the correct Champion part number for the 5.7 Hemi, and correctly says that 16 plugs are required; however If I want Autolite plugs instead, it gives me a part number but says only 8 plugs are required! (Maybe Autolite plugs are magic?).

It's basically a case of 'garbage in, garbage out' - - the computer cataloging at any of these places is only as accurate as whoever put the information in there is; Due to high volume I'm forced to use the computer cataloging, but anytime there appears to be a discrepancy or something isn't "clear" then I reach for the manufacturer's catalog and that usually clears up the confusion.

Another thing; you mentioned you got the Champion part number at Advanced Auto - - maybe you are not aware of this but the correct spark plug number (for ANY car built in the last 30 years or so) is listed on the emissions label under the hood. It will only list the number for the brand of plug the car came with, not competitive brands - - but in a case where there's confusion it's good information to have.

Last edited by kevenj; 08-20-2006 at 10:21 AM.
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post #5 of 44 (permalink) Old 08-20-2006, 11:38 AM
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I too stepped up to the #3570 Champions (Copper plug is #570 (RE14MCC4)). It is basically the copper plug with a finer platinum tipped electrode and a tapered ground electrode. It should eliminate the .005" of wear I noticed with the old plugs. Cost is only $1.95 each at rockauto.com. The Champion pure platinums were $4.14 and the iridiums ran $6.46, too much $$$ considering I'm keeping the 30K change interval. Because you can learn a lot about how an engine in running by the plugs and a 50K-100K interval is too long!

Champion's website for info on their plugs:
http://www.federalmogul.com/aftermar...ry=USA&NumIm=1
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post #6 of 44 (permalink) Old 08-20-2006, 12:10 PM Thread Starter
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Quote:
Originally Posted by kevenj
Another thing; you mentioned you got the Champion part number at Advanced Auto - - maybe you are not aware of this but the correct spark plug number (for ANY car built in the last 30 years or so) is listed on the emissions label under the hood. It will only list the number for the brand of plug the car came with, not competitive brands - - but in a case where there's confusion it's good information to have.
I had the Champion part number when I walked in the door. Also had the Part number for the NGK copper plug. But AA's computer does not list the RE14MCC4 for the 5.7 eventhough they sell them. Advance Auto & NAPA sells Champion while Pep Boys and Auto Zone did not. Thanks for the tip on the emission label.
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post #7 of 44 (permalink) Old 08-20-2006, 12:22 PM Thread Starter
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So, for those that are using or plan on using Platinum plugs are you still sticking with the 30k change schedule? Anyone going to keep them in for 100k miles?

There has been some debate on this board and LXforums that the platinum is not recommended by DCX for the 5.7 while it is ok for the V6 LX engines with 100k mile changes. I don't believe DXC was being greedy with the frequent spark plug changes on the 5.7 because if profit were the main reason they would have also put copper plugs and 30k mile changes on all those V6 cars. The "take rate" popularity on the 5.7 was a surprise to DCX - they did not expect the 5.7 to sell as well over the V6 cars initially.
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post #8 of 44 (permalink) Old 08-20-2006, 12:27 PM
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Quote:
Originally Posted by JGarten
I too plan on using platinum plugs for the consistent wear ($8 more for my $40,000 baby keeps me happy). Can you explain "larger heat affected zone"? I'm guessing you referring to MDS and the plugs which fire all the time vs. those which get a break when MDS is active?
Heat affected zone or the area darkened on the center insulator. Maybe your right this might have something to do with the MDS. See attached photo of plug from cylinder 1 primary and 3 secondary (Primary plug is directly below the coil and the secondary coil is on the other side of the engine)
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post #9 of 44 (permalink) Old 08-20-2006, 12:48 PM
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The question is, is there any downside to using platinums or double platinums other than the cost of the plug? I've asked a few techs that I trust and their opinions are split on this. Some say "no problem, they will just last longer" (which is what I tend to believe) while others have said there may be detrimental effects on other ignition components - - I guess the platinums take more voltage to fire ( ?? ). Almost all DIS engines call for double platinum plugs since half the time they fire "backwards" ( i.e. the spark jumps from the ground electrode to the center electrode, instead of the other way around). Maybe since we have dual plugs in our Hemi's they don't fire this way....I'm not sure.

I do know that the 6.1 comes with NGK double platinum plugs from the factory; and it's basically the same ignition system. Oh well at the rate I'm putting miles on my 5.7 I won't have to worry about plugs for a LONG time!
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post #10 of 44 (permalink) Old 08-20-2006, 06:24 PM
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Personally, I don't think it would be wise to leave plugs in an aluminum head for 100K miles. You're most likely to find them frozen in the head if you did. Remember to use anti-sieze on the plug threads, and seeing you should check the plugs way before 100K, might as well just use a good copper plug. NGK is my plug of choice, Champion makes great aviation plugs...but I don't think their auto plugs are near the quality of NGK.
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