Upgraded to a hotter coil

[Whuntmore]

there was a cleaning of the forums, and it might be gone...  but I hope not.   Double check that Jurjen.

[Jurjen]

Yup, it is gone.

But luckily I wrote it down on an old envelope of my pension insurance.
This is my research only, other Eaglers will have other preferences.
Last but not least, a word from the legal department: putting in other plugs than advised by AMC is your responsibility, not mine.

The Eagle runs best on simple plugs.
Only disadvantage is that they wear out quickly (6000 mls) in combination with the high voltage ignition.
I don't like plugs with multiple ground electrodes, because they cannot be adjusted.
And last but not least, I like the ones that protrude into the combustion chamber better because I expect the flame front to be more even (less knocking and better MPG).
Engines that are burning oil, are better off with plugs that have less protrusion
See and read under tip protrusion:
http://en.wikipedia.org/wiki/Spark_plug

Here we go:

Truckplugs Champion 4412
Some off roaders like the truckplugs best, but they are not being made any more.

Normal plugs
Champion RC12ECC
Autolite 985
NGK ZFR5N
Denso QJ16HR-Q
Bosch FR9HC+

Premium plugs
Champion RC12PEC5
Autolite AP 985
Bosch FR9HP+

Don't use, these plugs have no protrusion (or only in engines that burn oil, to prevent fouling up)
Champion RFN14LY (this is the plug advised by AMC)
NGK ZFR4-11
NGK ZFR5-11
NGK FR5-1

General data
Thread 14mm
Reach 3/4" (19mm)
Hex 5/8" (16mm)
extended projected tip

I'm still running the same AP985 that I promised to put in when I wrote this little guide.

[Whuntmore]

Awesome, and an egg to you for 'Rescuing' that info and saving it.  I'm finding myself doing that more and more all the time.

Smitch has already put that info up on the Eaglepedia.

http://www.amceaglesden.com/~iowaeagl/guide/index.php?title=Spark_Plug_Guide

[ammachine390]

Why not use the plug advised by AMC?

[Jurjen]

The "don't use" plugs have no protrusion,  they are fine to use, but not my first choice.
I think it was the "safe" choice for AMC, since they are more or less self cleaning when the engine is using a bit of oil.

[maddog]

i myself use the E3 diamond fire plugs and i am quite pleased with them as i have more power and a little better fuel economy. they cost $6 a plug but they have a five year or 100,000 mile warranty.

[ammachine390]

Jurjen, what do you have your plugs gapped to?

EDIT: Nevermind, I should have looked up before I typed this question.