Looking for OEM Spark plug information - Page 2 - Dodge Challenger Forum: Challenger & SRT8 Forums
General Maintenance Discussion This sub-forum is for the discussion of general maintenance of your Challenger such as oil changes, coolant maintenance, brake pad replacement, differential fluid changes, alignments, air filters and everything else to maintain your ride.

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post #11 of 23 (permalink) Old 04-03-2019, 05:45 PM
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Thanks for all the information!

The OEM spark plugs on my car call out to be changed at 100,000 miles. Would purchasing and installing the Iridium NGK 92145 spark plugs also give me the same maintenance interval as the OEM spark plug? (Being that they are iridium spark plugs)
Yes, they should give you the same service life as the OEM plugs. However, whatever the manufacturer lists as the plugs' service life is what you should expect.

It is very likely that any iridium/platinum topped plug will list its service life to be 100K miles, which is the same as the plugs that came in yours. But even if the plugs you buy do not promise 100K, they will still work just fine your engine*.

Also, be sure to check the gap on the new plugs. They will likely be the correct gap already (0.044"), but I have seen instances where the new plugs had to be re-gapped to match the spec'd gap, so it's not unheard of. And if you do have to alter the gap of the iridium/platinum tipped plugs, you must use the correct type of gapper, which is NOT the old-school slide-a-gap kind that use the plug's tip as the fulcrum to bend the electrode.

If you do not have a torque wrench, get one (1/4" drive will work, but 3/8" drive is better). The plugs will need to be properly torqued down into the cylinder head. You'll have to look up the torque spec for your particular engine, but it will be pretty low, like 15-20 ft/lbs.

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* - As long as you don't crazy and buy one of the gimmicky kind like E3 or RapidFire. Those aren't known for their robustness in operating in any engine, any platform. Stick with the known name brands, single electrode, and you'll be fine.

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post #12 of 23 (permalink) Old 04-03-2019, 06:12 PM Thread Starter
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Originally Posted by PFJsCustoms View Post
Thanks for all the information!

The OEM spark plugs on my car call out to be changed at 100,000 miles. Would purchasing and installing the Iridium NGK 92145 spark plugs also give me the same maintenance interval as the OEM spark plug? (Being that they are iridium spark plugs)
Yes, they should give you the same service life as the OEM plugs. However, whatever the manufacturer lists as the plugs' service life is what you should expect.

It is very likely that any iridium/platinum topped plug will list its service life to be 100K miles, which is the same as the plugs that came in yours. But even if the plugs you buy do not promise 100K, they will still work just fine your engine*.

Also, be sure to check the gap on the new plugs. They will likely be the correct gap already (0.044"), but I have seen instances where the new plugs had to be re-gapped to match the spec'd gap, so it's not unheard of. And if you do have to alter the gap of the iridium/platinum tipped plugs, you must use the correct type of gapper, which is NOT the old-school slide-a-gap kind that use the plug's tip as the fulcrum to bend the electrode.

If you do not have a torque wrench, get one (1/4" drive will work, but 3/8" drive is better). The plugs will need to be properly torqued down into the cylinder head. You'll have to look up the torque spec for your particular engine, but it will be pretty low, like 15-20 ft/lbs.

Nuke



* - As long as you don't crazy and buy one of the gimmicky kind like E3 or RapidFire. Those aren't known for their robustness in operating in any engine, any platform. Stick with the known name brands, single electrode, and you'll be fine.
Thanks for the input Nuke!
It seems that the OEM spark plugs for our vehicles cost close to 12 dollars while the NGK aftermarket iridium spark plugs can be had at about half the price. Multiply by 16 and there is a big difference in price.

What have folks gone with when changing their spark plugs? Any notable differences with aftermarket ones?
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post #13 of 23 (permalink) Old 04-03-2019, 06:33 PM
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Originally Posted by PFJsCustoms View Post
Thanks for the input Nuke!
It seems that the OEM spark plugs for our vehicles cost close to 12 dollars while the NGK aftermarket iridium spark plugs can be had at about half the price. Multiply by 16 and there is a big difference in price.

What have folks gone with when changing their spark plugs? Any notable differences with aftermarket ones?
I believe most folks go with the NGKs, I did myself the first change I did on my Hemi. This most recent change I actually went with Champion, but it was mostly because the economics of the deal. You won't notice a performance increase from one brand to the next, they are all going to be pretty much the same.

BTW - the 2 plugs per cylinder thing is not about squeezing out more power per combustion event. They do not fire at the same time in each cylinder. One plug fires on the combustion stroke when the air/fuel mixture is compressed, and then the other plug fires a little bit later as the piston is on the way down during that power stroke.

That approach is about ensuring any unburned remnants of fuel/air mixture is ignited and burned completely each cycle, thereby keeping harmful emissions to an absolute minimum. So while you might have been apprehensive before about driving such a harmful pollution machine as the Dodge V8 Hemi engine, you can now rest easy with the knowledge that you are actually doing your part to save the penguins and polar bears by driving a car which is powered by a (kinda)green engine!
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post #14 of 23 (permalink) Old 04-03-2019, 08:22 PM Thread Starter
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I believe most folks go with the NGKs, I did myself the first change I did on my Hemi. This most recent change I actually went with Champion, but it was mostly because the economics of the deal. You won't notice a performance increase from one brand to the next, they are all going to be pretty much the same.

BTW - the 2 plugs per cylinder thing is not about squeezing out more power per combustion event. They do not fire at the same time in each cylinder. One plug fires on the combustion stroke when the air/fuel mixture is compressed, and then the other plug fires a little bit later as the piston is on the way down during that power stroke.

That approach is about ensuring any unburned remnants of fuel/air mixture is ignited and burned completely each cycle, thereby keeping harmful emissions to an absolute minimum. So while you might have been apprehensive before about driving such a harmful pollution machine as the Dodge V8 Hemi engine, you can now rest easy with the knowledge that you are actually doing your part to save the penguins and polar bears by driving a car which is powered by a (kinda)green engine! [IMG class=inlineimg]/forums/images/ChallengerTalk_2014/smilies/tango_face_grin.png[/IMG]

Thanks for sharing your experience with changing the spark plugs Nuke! Not to mention the insight into our green lean machines! Hahaha

Anyone else gone the aftermarket route? Or OEM?
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post #15 of 23 (permalink) Old 04-03-2019, 09:30 PM
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I think the 2 plugs fire at the same time. Hal even mentions it in these threads. There is only 1 control wire (switched ground) going into each coil pack (the other is 12V). I have had a scope on the control wire and I am pretty sure I only saw one pulse per rev. I checked this when I installed my innovate gauge which has a shift light built in.
https://www.challengertalk.com/forum...k-plugs-82334/
https://www.challengertalk.com/forum...e-time-233410/

Also see pages 146/147 of the FCA workbook here which gives the impression that the coils are only fired once per revolution. Although it could very well be specific to the V6.
https://www.challengertalk.com/forum...5&d=1550198450

And one more source.
https://auto.howstuffworks.com/hemi3.htm
"The HEMI Magnum engine has two valves per cylinder as well as two spark plugs per cylinder. The two spark plugs help to solve the emission problems that plagued Chrysler's earlier HEMI engines. The two plugs initiate two flame fronts and guarantee complete combustion."


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post #16 of 23 (permalink) Old 04-03-2019, 11:12 PM
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Fine, @PFJsCustoms is a penguin-killing, polar bear hating, one man pollution machine, and he does it for the worst of all reasons - in the relentless search for more stump-pulling torque.

Is that better? Are you happy now?!?!

I swear @ChallyTatum , if you don't stop using logic and reason when you refute me, I'm going to have to complain to the mods!

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I think the 2 plugs fire at the same time. Hal even mentions it in these threads. There is only 1 control wire (switched ground) going into each coil pack (the other is 12V). I have had a scope on the control wire and I am pretty sure I only saw one pulse per rev. I checked this when I installed my innovate gauge which has a shift light built in.
https://www.challengertalk.com/forum...k-plugs-82334/
https://www.challengertalk.com/forum...e-time-233410/

Also see pages 146/147 of the FCA workbook here which gives the impression that the coils are only fired once per revolution. Although it could very well be specific to the V6.
https://www.challengertalk.com/forum...5&d=1550198450

And one more source.
https://auto.howstuffworks.com/hemi3.htm
"The HEMI Magnum engine has two valves per cylinder as well as two spark plugs per cylinder. The two spark plugs help to solve the emission problems that plagued Chrysler's earlier HEMI engines. The two plugs initiate two flame fronts and guarantee complete combustion."
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post #17 of 23 (permalink) Old 04-03-2019, 11:35 PM
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I swear @ChallyTatum , if you don't stop using logic and reason when you refute me, I'm going to have to complain to the mods!


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post #18 of 23 (permalink) Old 04-04-2019, 02:26 AM
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post #19 of 23 (permalink) Old 04-04-2019, 04:56 AM
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Fine,

I swear @ChallyTatum , if you don't stop using logic and reason when you refute me, I'm going to have to complain to the mods!
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post #20 of 23 (permalink) Old 04-04-2019, 06:32 AM
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