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  #13  
Old 11-28-2012, 11:50 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Iridium? How bout silver? (X16... ouch).

I don't like the idea of nickel in there. Full platinum is a nice option... Too many options, but copper is really the best unless you have trouble changing your plugs regularly, from what I've read.


Thanks for the write-up. I'll be finding this in a year when I'm due. Did you notice any difference in the plugs? Good cylinders versus bad?
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  #14  
Old 11-29-2012, 11:13 AM
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Re: DIY: Hemi 5.7L Spark Plug Change

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Originally Posted by nek121328 View Post
Not all Iridium plugs are made the same. The Champion version has copper cored center and ground electrodes and were installed in my WK2 by the dealer. No problem with warranty.
"No problem with warranty" as long as you keep changing them every 32K miles while you are under warranty. You can certainly use what you want, but you still need to follow the maintenance schedule while you are under warranty.
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Old 11-29-2012, 05:57 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

nice write up - how much was your back hurting from leaning/bending over...unless you're 6' 5"
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  #16  
Old 11-29-2012, 06:13 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

I was talking to a fellow mopar friend regarding the HEMI. does anyone know if it makes a difference in HP if the electrodes BOTH point towards the center of the cylinder? Better burn. In addition, the spark plug washer must also be removed in order to recess the plug deeper into the head. Thus more spark as well.

Or is our knowledge to dated to the 392?
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Old 11-29-2012, 06:55 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

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Originally Posted by armoredsaint View Post
nice write up - how much was your back hurting from leaning/bending over...unless you're 6' 5"
Haha definitly a bit sore afterwards. The front bumper sticks out right at your knees making it a bit of an awkward stance but not too bad. Sounds like you speak from experience

Quote:
Originally Posted by jeepmanjim View Post
I was talking to a fellow mopar friend regarding the HEMI. does anyone know if it makes a difference in HP if the electrodes BOTH point towards the center of the cylinder? Better burn. In addition, the spark plug washer must also be removed in order to recess the plug deeper into the head. Thus more spark as well.
Or is our knowledge to dated to the 392?
That is the first I have heard about removing the plug washers - where did you find this info? I also can't imagine plug orientation would make any noticeable difference but I could be wrong?!?
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Old 11-30-2012, 12:19 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Indexing spark plugs can improve efficiency, performance shops sell various thicknesses for that purpose. Never eliminate the washer. It's like a lock washer in keeping the plug in place. Ever have one loosen? Have seen several photos of the damage to the plug and cylinder head.
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Old 11-30-2012, 12:33 PM
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Good write up, you are lucky with your 16 spark plugs. I got the 05 first gen Hemi I had the wires it was a big pain took me 2 hours to change. But once done the jeep felt alot better.
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Old 11-30-2012, 12:36 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

You guys are fast. When I had my Aspen, it was taking 3-4 hrs for the first change. Luckily, I traded it before I needed them.
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Old 11-30-2012, 03:36 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Quote:
Originally Posted by SixZeroFour View Post
Haha definitly a bit sore afterwards. The front bumper sticks out right at your knees making it a bit of an awkward stance but not too bad. Sounds like you speak from experience



That is the first I have heard about removing the plug washers - where did you find this info? I also can't imagine plug orientation would make any noticeable difference but I could be wrong?!?
Mopar Muscle Magazine, they dyno'd it at a 10hp difference. But that's on the pre 09 engine. I made a socket for mine and endured both procedures were followed.

Think about it, makes perfect sense.
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Old 11-30-2012, 03:38 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

If both electrodes are facing the cylinder wall and deeper recess plug = better burn
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Old 11-30-2012, 03:40 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

http://http://www.moparmusclemagazine.com/techarticles/engine/mopp_1209_late_model_hemi_goes_old_school_gen_3_gi veaway/viewall.html

That's the head, I'll supply the article when I get it
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Old 12-02-2012, 11:32 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

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Originally Posted by jeepmanjim View Post
If both electrodes are facing the cylinder wall and deeper recess plug = better burn
Maybe. But with 2 plugs already, and especially in this application, it is just silly to consider. Its an suv, no?

I regularly track my sports car and dont index plugs. It just isnt worth it.

And 10 hp out of 360 is within the margin of error of most measurements i suppose. That goes for all 10 hp gain gimmicks.
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