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  #13  
Old 08-18-2012, 11:28 PM
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Re: Spark Plugs

Champion 570s... all 16 of em'
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  #14  
Old 08-19-2012, 12:03 PM
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Re: Spark Plugs

I just didnt my turn up yesterday and i replace them with Autolite Iridiums XP5263 and let me tell you shes running like a mad jeep on steroids.
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  #15  
Old 08-19-2012, 08:12 PM
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Re: Spark Plugs

Quote:
Originally Posted by DaGreenMile View Post
I just didnt my turn up yesterday and i replace them with Autolite Iridiums XP5263 and let me tell you shes running like a mad jeep on steroids.
Recommend you keep your old plugs.

FWIW, several other threads and forums have reports that the non-copper core plugs (e.g., platinum and iridium) are the cause of 5.7L HEMI engine performance irregularities (stalling and bucking) after ~5,000 miles following installation. IDK if this is true, but why upgrade to something that is changed out every 30K miles?

I am aware that other Jeep engines (e.g., 4.0L I-6, 4.7L V-8, and 6.1L HEMI) use other more sophisticated & longer-change-out spark plugs. However, I have never heard a technical explanation on why only the 5.7L HEMI takes copper core plugs every 30K miles.

Perhaps you've hit on an acceptable substitute for Champion 570's. Please keep us informed. In my case, it's a 30K miles changeout anyway to keep the Lifetime Limited Powertrain Warranty in force, so extended spark plug life is not an option.
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  #16  
Old 08-19-2012, 08:19 PM
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Re: Spark Plugs

I just installed a 2 step colder NGK set of 16 in my engine. Im feeling a difference
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  #17  
Old 08-19-2012, 08:36 PM
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Re: Spark Plugs

Quote:
Originally Posted by lvspeedemon View Post
I just installed a 2 step colder NGK set of 16 in my engine. Im feeling a difference
....and you have a 6.1L HEMI. Believe the OP has a 5.7L HEMI. They have different plug requirements:
The earlier 5.7L HEMI's use OEM P/N SPRE14MCC4 (Champion 570)
The VVT 5.7L HEMI's use OEM P/N SPLZFR5C11 (NGK)
The 6.1L HEMI's use OEM P/N SPLZTR5A13 (NGK Double-Platinum 4998)
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  #18  
Old 08-21-2012, 07:13 AM
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Re: Spark Plugs

I dont know i like the throttle response its def an improvement and a lot smoother then the ones that were in before.
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  #19  
Old 08-22-2012, 09:19 PM
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Re: Spark Plugs

I know walt, just wanted to throw in my 2cents. I do believe a few guys running the stock 6.1L plugs and have noticed a little more pick me up.
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  #20  
Old 08-22-2012, 09:35 PM
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Re: Spark Plugs

I may order a huge quanity of oe plugs at my employee discount and maybe do a blow out sale? anyone possibly interested?
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  #21  
Old 08-23-2012, 04:07 PM
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Re: Spark Plugs

Quote:
Originally Posted by DaGreenMile View Post
I just didnt my turn up yesterday and i replace them with Autolite Iridiums XP5263 and let me tell you shes running like a mad jeep on steroids.
iridium plugs do not have as hot of a spark as Copper; they are designed for extended service intervals, useful with other vehicles. What you are feeling is the difference between an old plug and a new one. There is a good chance your Hemi will start stumbling in a few thousand miles, so change them out to the Champion 570's when that happens and chalk it off to not listening to those who offered advice.
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  #22  
Old 08-23-2012, 07:25 PM
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Re: Spark Plugs

Quote:
Originally Posted by dmsfun View Post
iridium plugs do not have as hot of a spark as Copper; they are designed for extended service intervals, useful with other vehicles. What you are feeling is the difference between an old plug and a new one. There is a good chance your Hemi will start stumbling in a few thousand miles, so change them out to the Champion 570's when that happens and chalk it off to not listening to those who offered advice.
FWIW, I have 4 Champion 570's, 4 Champion 3570 platinum's, and 4 MOPAR OEM plugs to test.

When school starts next week, I will measure resistance (R), inductance (L), and capacitance (C) of each to see if there is a discernable difference. We have LCR meters in the physics lab. Should be an interesting experiment.

Will post results for general interest......
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  #23  
Old 08-25-2012, 08:05 AM
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Re: Spark Plugs

To measure a plug's spark efficiency, you need to monitor it actually firing in a cylinder. At Mich Tech Univ. they have such a setup in their lab for comparing plugs.
http://www.me.mtu.edu/researchAreas/...SIImaging.html
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  #24  
Old 08-26-2012, 08:06 PM
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Re: Spark Plugs

Quote:
Originally Posted by dmsfun View Post
To measure a plug's spark efficiency, you need to monitor it actually firing in a cylinder. At Mich Tech Univ. they have such a setup in their lab for comparing plugs.
http://www.me.mtu.edu/researchAreas/...SIImaging.html
We can report our test results concurrently.

From what I've read so far, it's not efficiency that is the issue. It's effective ignition timing and DTC's generated by the PCM. If one changes the inductance or capacitance of the secondary circuit, the voltage curve will change and therefore the breakdown of the dielectric that leads to spark arc across the electrodes.

I'm doing this out of general curiosity. Since the materials of construction among the 3 plugs are likely different, I assume some of the basic electrical parameters will be different also. Maybe not. That's the purpose of the experiment.

For my '08 5.7L HEMI, I will continue to use Champion 570's or OEM SPRE14MCC4, whichever is cheaper at the time. Changeout is 30K miles, irrespective of plug type. Jeep has 86,500 miles on it now and no plug issues; it would take some strong objective evidence for me to consider changing.
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