NGK Spark Plug Question!?

Foxhound · 02-02-2010, 06:20 PM

Hey fellas, I have searched around and figured out that the general population on this forum says to double check your gap on pre-gapped spark plugs. Well, I want to purchase a pre-gapped NGK FR5AP-11 and wanted to confirm whether or not this matches EXACTLY with our engine specs (I drive a 4eat 06 2.5i, auto I know). The manual tells me that this is the exact OEM Model # and I was curious if I will need to make any modifications before the install.

Thanks ahead of time!

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dr3w · 02-02-2010, 06:28 PM

Always recheck your gap.. it takes all of 5 seconds and zero skill.

Foxhound · 02-02-2010, 07:02 PM

What is the gap for my car's application? I think the -11 at the end of FR5AP-11 indicates that it is 1.1mm, or in other words .43-.44''. Is this the gap I want?

RaceFaceXC · 02-02-2010, 08:51 PM

FR5AP-10's are actually what the 06+ requires. the owners manual is F'ed, kinda. it specifies a gap that contradicts with the gap of the plug that they specify by P/N. The -10's have the correct gap and will stay in the acceptable range longer than the -11's because they start right on spec and grown instead of starting just high of spec and getting worse as they wear.

Chk it out

Foxhound · 02-02-2010, 09:58 PM

Thanks a mill! Good to know this kinda stuff PRIOR to installing rather than AFTER

RaceFaceXC · 02-02-2010, 11:25 PM

haha, anytime! thats what NASIOC is here for... amongst other things. But, like you guessed, you should always chk the gap before installing and on iridium/plat plugs regapping is very risky because the cathode is just coated or plated with platinum/iridium and even a scuffing with a gapping tol can damage it. If you have to re-gap, only touch the anode (the finger that reaches from the top if the threaded barrel to over the center electrode and dont touch the electrode that is inside the center of the ceramic insulator). even using feeler gauges can scuff the center electrode that is coated with the soft platinum/iridium, so be super careful when measuring gap.

02-02-2010, 06:20 PM	#1
Foxhound Scooby Newbie Member#: 170336 Join Date: Jan 2008 Chapter/Region: SCIC Location: Moorpark, California 93021 Vehicle: 06 Impreza 2.5i CGM	NGK Spark Plug Question!? Hey fellas, I have searched around and figured out that the general population on this forum says to double check your gap on pre-gapped spark plugs. Well, I want to purchase a pre-gapped NGK FR5AP-11 and wanted to confirm whether or not this matches EXACTLY with our engine specs (I drive a 4eat 06 2.5i, auto I know). The manual tells me that this is the exact OEM Model # and I was curious if I will need to make any modifications before the install. Thanks ahead of time! * Registered users of the site do not see these ads.

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02-02-2010, 06:28 PM	#2
dr3w Scooby Specialist Member#: 222318 Join Date: Sep 2009 Chapter/Region: E. Canada Location: Montreal Vehicle: 1993 RHD GC8 Silver	Always recheck your gap.. it takes all of 5 seconds and zero skill.

02-02-2010, 07:02 PM	#3
Foxhound Scooby Newbie Member#: 170336 Join Date: Jan 2008 Chapter/Region: SCIC Location: Moorpark, California 93021 Vehicle: 06 Impreza 2.5i CGM	What is the gap for my car's application? I think the -11 at the end of FR5AP-11 indicates that it is 1.1mm, or in other words .43-.44''. Is this the gap I want?

02-02-2010, 08:51 PM	#4
RaceFaceXC Scooby Specialist Member#: 165749 Join Date: Dec 2007 Chapter/Region: South East Location: stupid Florida Vehicle: 2007 No YELLING on the bus!	FR5AP-10's are actually what the 06+ requires. the owners manual is F'ed, kinda. it specifies a gap that contradicts with the gap of the plug that they specify by P/N. The -10's have the correct gap and will stay in the acceptable range longer than the -11's because they start right on spec and grown instead of starting just high of spec and getting worse as they wear. Chk it out

02-02-2010, 09:58 PM	#5
Foxhound Scooby Newbie Member#: 170336 Join Date: Jan 2008 Chapter/Region: SCIC Location: Moorpark, California 93021 Vehicle: 06 Impreza 2.5i CGM	Thanks a mill! Good to know this kinda stuff PRIOR to installing rather than AFTER

02-02-2010, 11:25 PM	#6
RaceFaceXC Scooby Specialist Member#: 165749 Join Date: Dec 2007 Chapter/Region: South East Location: stupid Florida Vehicle: 2007 No YELLING on the bus!	haha, anytime! thats what NASIOC is here for... amongst other things. But, like you guessed, you should always chk the gap before installing and on iridium/plat plugs regapping is very risky because the cathode is just coated or plated with platinum/iridium and even a scuffing with a gapping tol can damage it. If you have to re-gap, only touch the anode (the finger that reaches from the top if the threaded barrel to over the center electrode and dont touch the electrode that is inside the center of the ceramic insulator). even using feeler gauges can scuff the center electrode that is coated with the soft platinum/iridium, so be super careful when measuring gap.