Trying to find a colder spark plug
08-28-2015, 06:48 PM
#1
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Trying to find a colder spark plug
Application is a 1995 jeep cherokee 4.0. I'm looking to go a stage colder than stock. If anyone has some numbers for me that would be great.
08-28-2015, 07:15 PM
#4
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Year: 1998
Engine: 4.0
I believe the Champion RC10ECC is the next coldest plug for the Xj's, but like roninofako asked, "Why?" Sometimes a colder plug does nothing but mask underlying symptoms that may need looked at first.
08-28-2015, 08:01 PM
#6
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I have a wh1c mocked up. My current plugs are high milage so might as well drop the range on them. Thank you for the part number.
08-28-2015, 11:54 PM
#7
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http://www.sparkplug-crossreference.com/convert/champ_pn/rc10ecc
Using the site above, and rc10ecc as my search I came across the NGK colder plug, the ZFR6F11. Which adds some fun because this is the response that I got back from a tech at NGK. My compression ratio is 8.8:1.
Thank you very much for that information. Since you lowered the compression ratio, and added boost, it evened it out, so you can run your stock plugs, which is FR5-1 (stock# 7252). Because of the extended metal shell design on the thread, it is a very specific plug, which narrows your choices down. After few runs, please pull the plug to make sure they look good.
Using the site above, and rc10ecc as my search I came across the NGK colder plug, the ZFR6F11. Which adds some fun because this is the response that I got back from a tech at NGK. My compression ratio is 8.8:1.
Thank you very much for that information. Since you lowered the compression ratio, and added boost, it evened it out, so you can run your stock plugs, which is FR5-1 (stock# 7252). Because of the extended metal shell design on the thread, it is a very specific plug, which narrows your choices down. After few runs, please pull the plug to make sure they look good.
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