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Old 03-11-2006, 11:28 AM   #1
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Spark Plugs

Tom: Here is a question....
I have been running the ZFS22C for about 500-600 miles and the insulaters keep cracking on them. I have gone through two sets in the last thousand miles. Playing with the gap I found that 40 was the best and power was great. BUT The plugs are showing signs of getting extremly hot. Now I have been moving about with different plugs as well.. The set I just pulled is the double plats APP5364 autolites and they are rainbow colored and heat speckeled as well. So last night I put in a set of single plats AP5364 and I will see what they do. Any ideas?
I could tell there was a problem when at higher revs there seemed to be a slight miss so I cheked the plugs. Thats when I noticed the cracked insulaters. After changing them the miss went away. #3 plug is looking a bit tanish so I did a compression check and a leak down as well to make sure I not burning anything and the test came out fine. Very equal cyl press. and no leak down. So the motor
seems fine at this point.
But for #3 I found the cruise control cable laying on the wire and signs of conduct on it so I moved that. That may be the reason for the off color on that plug. I will find out that today any suggestions or insights??


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Old 03-11-2006, 07:43 PM   #2
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i know tom does not like these plugs but i have denso iridum 3 steps colder in mine and have not had a problem they are a little pricey but in my opinion worth it
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Old 03-12-2006, 01:00 AM   #3
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And what is the part # or plug .
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Old 03-12-2006, 01:05 AM   #4
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^^^bump^^^
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Old 03-12-2006, 06:23 AM   #5
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Is it cracking inside or out side the chamber , If it is inside you have to much Cyl temp if it is outside the chamber the insulator is cracking you are doing it installing them

Plat plugs are not made for high Cyl load or temp in most cases they are a much hotter plug as for plug heat range

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Old 03-12-2006, 11:21 AM   #6
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Outside. Under the nipple for the boot.... I cannot believe I`m cracking them at install. I have the correct tools... Maybe a bit over torque? I mean ,I can belive I cracked one but not 3 in two sets. I`ll keep you posted.
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Old 03-12-2006, 02:20 PM   #7
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Yea my guess would be your doing it on install. Plugs should be coated with antiseas and tightened just over hand tight

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Old 03-12-2006, 05:55 PM   #8
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yeah the plug only needs to be run down by hand and given just a SLIGHT snugging. Also, are you using a plug socket that has the rubber boot inside it to protect the plug?

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Old 03-13-2006, 03:35 PM   #9
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Yes and Yes..... I will try another set of 22c`s and be real carefull on install. I have the rubber booted socket and anti-seize... I just have not broken a plug at install since the late 70`s. Geez I`m friggin old. I did get better performance with the ZFS22C plug, but I guess I could a gorrilla wrenched-em on...
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