Proper gaping for 84 Spark plugs? - JeepForum.com
 
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post #1 of 12 Old 05-09-2013, 09:33 AM Thread Starter
NickP84CJ7
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Proper gaping for 84 Spark plugs?

4.2L 258
New HEI distributor just installed
What gap should i have on spark plugs?
Also could someone recommend me a Performance Plug?

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post #2 of 12 Old 05-09-2013, 09:47 AM
CSP
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0.045"
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post #3 of 12 Old 05-09-2013, 09:58 AM
Matt1981CJ7
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And the consensus is to don't bother with platinum plugs. Just buy standard Autolite copper.

Matt
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post #4 of 12 Old 05-09-2013, 10:37 AM Thread Starter
NickP84CJ7
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Matt I have the Autolite copper brand new and they burnt out... any idea why? i had just assumed it was because of the HEI distributor needing something of better quality?
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post #5 of 12 Old 05-09-2013, 10:41 AM
Matt1981CJ7
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It sounds like you have some tuning to do.

The Autolites are what many of us have run for years.

Matt
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post #6 of 12 Old 05-09-2013, 10:55 AM
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Define what you mean by they "burnt out".
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post #7 of 12 Old 05-09-2013, 11:29 AM
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^^^This.^^^

And Matt's right. All the fancy schmanzy* plugs made from obtanium that cost upwards of $8 a piece just don't seem to do anything for these old engines. A good old Copper plug does fine

*Schmancy? smanzy? smantsy?

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post #8 of 12 Old 05-09-2013, 01:33 PM
Balvar24
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$2 plugs are where it's at.

"Work hard, rock hard, eat hard, sleep hard, grow big, wear glasses if you need 'em."
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post #9 of 12 Old 05-09-2013, 03:00 PM Thread Starter
NickP84CJ7
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Just got some plugs but they are .040 not .045 does that make a huge difference?
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post #10 of 12 Old 05-09-2013, 03:04 PM
Balvar24
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Gap 'em. Tool costs less than the set of plugs.

"Work hard, rock hard, eat hard, sleep hard, grow big, wear glasses if you need 'em."
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post #11 of 12 Old 05-09-2013, 04:43 PM
swatson454
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I actually prefer the smaller gaps and don't go wider than .040. JMHO


Shawn

Live in a way that those who know you but don't know God will come to know God because they know you.
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post #12 of 12 Old 05-09-2013, 06:48 PM
WindKnot
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Quote:
Originally Posted by NickP84CJ7 View Post
Just got some plugs but they are .040 not .045 does that make a huge difference?
Plugs are meant to be gapped before installing.

I'd rather be lost on the trails than found at home!

Phoenix Rising- A Flame Off Restoration? http://www.jeepforum.com/forum/f8/ph...ation-1807257/
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