Spark Plugs
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 103
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
I just emailed NGK again with my photo and asked them what the purpose of the unthreaded extension on the FR5-1 is for.
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 103
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
The RC12ECC is specified all the way up to 2001. By the looks of it, the RC12ECC and the NGK ZFR5N look the same. The NGK FR5-1 specified as their plug for the '98 (0630 head).
I just emailed NGK again with my photo and asked them what the purpose of the unthreaded extension on the FR5-1 is for.
I just emailed NGK again with my photo and asked them what the purpose of the unthreaded extension on the FR5-1 is for.
Hello,
This is referred to as an extended shell reach, Chrysler is one of the only OEM companies to use this as it is meant to protect the firing electrode from spark blow out.
Best Regards,
Jason Norwood
NGK Spark Plugs ( USA) Inc.
Technical Services Administrator – Aftermarket Division
46929 Magellan Drive
Wixom, MI 48393
Office: (248)-926-7107
Fax: (248)-926-6938
Email: jnorwood@ngksparkplugs.com
ASE Certified
Ngksparkplugs.com
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Below is the reply to my email asking about the extension on the FR5-1 plug. As far as I'm concerned, school's still out on this. I think I'll stick with my ZFR5N plugs.
Hello,
This is referred to as an extended shell reach, Chrysler is one of the only OEM companies to use this as it is meant to protect the firing electrode from spark blow out.
Best Regards,
Jason Norwood
NGK Spark Plugs ( USA) Inc.
Technical Services Administrator – Aftermarket Division
46929 Magellan Drive
Wixom, MI 48393
Office: (248)-926-7107
Fax: (248)-926-6938
Email: jnorwood@ngksparkplugs.com
ASE Certified
Ngksparkplugs.com
CF Veteran
Joined: Oct 2013
Posts: 2,097
Likes: 12
From: Tarpon Springs, FL / Denver, CO
Year: '98
Engine: 4.0 I6
Sorry to necro post, but I tried searching and came up empty
Do I want the FR5-1 or the ZFR5N for my 98 XJ 4.0? Rock auto is pulling up the FR5-1 and other parts stores are pulling up the ZFR5N
Is the only difference the amount of threads protecting the ceramic? Rock Auto is saying that the gap on the FR5-1 is .04 vs. .036 for the ZFR5N but I always check gap anyways
The price is identical or I would have gone with the cheaper option already, lol
Do I want the FR5-1 or the ZFR5N for my 98 XJ 4.0? Rock auto is pulling up the FR5-1 and other parts stores are pulling up the ZFR5N
Is the only difference the amount of threads protecting the ceramic? Rock Auto is saying that the gap on the FR5-1 is .04 vs. .036 for the ZFR5N but I always check gap anyways
The price is identical or I would have gone with the cheaper option already, lol
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Sorry to necro post, but I tried searching and came up empty
Do I want the FR5-1 or the ZFR5N for my 98 XJ 4.0? Rock auto is pulling up the FR5-1 and other parts stores are pulling up the ZFR5N
Is the only difference the amount of threads protecting the ceramic? Rock Auto is saying that the gap on the FR5-1 is .04 vs. .036 for the ZFR5N but I always check gap anyways
The price is identical or I would have gone with the cheaper option already, lol
Do I want the FR5-1 or the ZFR5N for my 98 XJ 4.0? Rock auto is pulling up the FR5-1 and other parts stores are pulling up the ZFR5N
Is the only difference the amount of threads protecting the ceramic? Rock Auto is saying that the gap on the FR5-1 is .04 vs. .036 for the ZFR5N but I always check gap anyways
The price is identical or I would have gone with the cheaper option already, lol
CF Veteran
Joined: Oct 2013
Posts: 2,097
Likes: 12
From: Tarpon Springs, FL / Denver, CO
Year: '98
Engine: 4.0 I6
Damn, lightning fast response at 1 AM. Thanks as always Cruiser
The ZFR5N is cheap enough for me to get locally ($2.50 vs $4.29) so that's a bonus
Switching from the Champions because the NGK's seem to be better quality overall (japan vs china made)
The ZFR5N is cheap enough for me to get locally ($2.50 vs $4.29) so that's a bonus
Switching from the Champions because the NGK's seem to be better quality overall (japan vs china made)
Last edited by investinwaffles; May 19, 2017 at 02:34 AM.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
chumpions are made in China now?
CF Veteran
Joined: Oct 2013
Posts: 2,097
Likes: 12
From: Tarpon Springs, FL / Denver, CO
Year: '98
Engine: 4.0 I6
I honestly have no idea, that was according to the internets and a few forum postings I found while half asleep.
NGK does seem to be higher quality though, made in Japan according to the box
NGK does seem to be higher quality though, made in Japan according to the box
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