Spark plugs again... - JeepForum.com
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post #1 of 49 Old 09-17-2014, 09:58 PM Thread Starter
CrankyD
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Spark plugs again...

The patient = 1985 4.2 engine, stock rebuild, 4.2 head, nuttered with a 2100, team rush done.

I've had Champion rfn14ly plugs in the motor for the last few years (about 10k mi). When I checked them today I noticed that I have some insulator cracking and exfoliation. This may be from long ago when I still had the BBD on there maybe not. Either way going for another set. Should I get the same plugs? I'm pretty set on running Champs but I would consider other copper plugs. No fancy plugs for me thanks.

The electrode wear looks good and so does the color, I just think the front 3 ran lean when I had the BBD on there. It ran fine, just thought I should pull them since I am working on some valvetrain related clatter.

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post #2 of 49 Old 09-17-2014, 10:24 PM
RenoF250
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The insulator came apart for being lean? Could you post pics?

I have never liked Champion, may favorite was Autolite but now they are made in China so I would go with Motorcraft or AC.

You sure it is valve clatter and not busted skirts from running lean?
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post #3 of 49 Old 09-18-2014, 06:44 AM Thread Starter
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Yeah it's definatly doesn't sound piston related. I had a similar noise in the past so I pulled off the valve cover to investigate, so far so good except for the rocker fulcrums look worn. The oil groove is smoothed over on the two I looked at. pushrods were straight and were oiling well. The valve stems looked good too.

This was the problem last time I had this same noise. https://www.jeepforum.com/forum/f8/fo...-tick-1163477/

The noise I have is very similar to the jeep in this video (not mine). https://www.youtube.com/watch?v=TjbK7Mkw-tk

Theese are the plugs. I have a general hatred for champion plugs going back 25 years, but they ran really welll in my jeep so far, so i'm inclined to stick with them. I just want to be sure they are the right heat range for my setup. I only got the first two out last night before I called it quits. (Edit: the pics show them a bit grayer than they really are, the color looks nice and tan in person, except the burned spots)
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post #4 of 49 Old 09-18-2014, 07:11 AM
grasmo
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do not use anti-seize. it will effectively change the heat range of the plug. it will make it a much hotter plug.
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post #5 of 49 Old 09-18-2014, 07:12 AM Thread Starter
CrankyD
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Never heard that one before. Hmmm. Do you know what causes it?
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post #6 of 49 Old 09-18-2014, 07:18 AM
grasmo
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it blocks the heat transfer. even an improperly torqued plug will change the heat range.
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post #7 of 49 Old 09-18-2014, 07:41 AM
CrustySprings
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Most people seem to like Autolite 985's for our application.

258 cu. inch six, Team Rush ignition upgrade, T5, Dana 300, Superwinch lockouts, Black Diamond 3" suspension lift, greasable shackles, poly bushings, JKS quick discos, 32x11.50x15 Cooper STT's, American Racing 23 15x8 alloys, Uniden Pro 520XL CB radio, 2' adjustable tip Firestick antenna, Viair 460 onboard air system
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post #8 of 49 Old 09-18-2014, 07:49 AM
grasmo
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if you want a dam good plug, run an NGK. if the plug for your app. uses the R character, get the same one minus the R.
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post #9 of 49 Old 09-18-2014, 08:09 AM
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Quote:
Originally Posted by CrustySprings View Post
Most people seem to like Autolite 985's for our application.
Have you seen them recently? They are not made as well. They looked wrong to me so I checked the box and they are now made in China. I am done with Autolite.
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post #10 of 49 Old 09-18-2014, 08:10 AM
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Quote:
Originally Posted by grasmo View Post
it blocks the heat transfer. even an improperly torqued plug will change the heat range.
I find that very have to believe. There is metal in the anti-seize so it should conduct heat fairly well. Besides it gets squeezed out of the contact areas. I have never noticed a difference.
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post #11 of 49 Old 09-18-2014, 08:12 AM
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Are you sure that is the insulator? In the first pic it looks like something is caked on it because there is similar looking gunk on the ground electrode.
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post #12 of 49 Old 09-18-2014, 08:41 AM Thread Starter
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Yeah its acually the ceramic flaking off. The cener electrode is dirty and crusty but looked pretty good.
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post #13 of 49 Old 09-18-2014, 09:13 AM Thread Starter
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Flame resistant clothing deployed...
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post #14 of 49 Old 09-18-2014, 10:16 AM
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Quote:
Originally Posted by grasmo View Post
do not use anti-seize. it will effectively change the heat range of the plug. it will make it a much hotter plug.
Your source for that info?
BTW-Your wrong.
Copper AS on s'plugs is common/smart move.
LG

Have'n you along, is like loose'n 2 good men
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post #15 of 49 Old 09-18-2014, 10:20 AM
LumpyGrits
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Quote:
Originally Posted by CrustySprings View Post
Most people seem to like Autolite 985's for our application.
THIS--
Torque to 20-25 ft/lbs and add a dab of copper A/S to the threads. Use some die-electric grease in the wires connector.
LG

Have'n you along, is like loose'n 2 good men
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