Spark plugs, spark plugs, spark plugs.... - Subaru Outback - Subaru Outback Forums
Reply
 
LinkBack Thread Tools Rate Thread
post #1 of 20 (permalink) Old 02-24-2013, 10:03 PM Thread Starter
Registered User
 
Join Date: Feb 2013
Posts: 10
Feedback Score: 0 reviews
Spark plugs, spark plugs, spark plugs....

I don't want to start a thread on "how to", this is about spark plug selection.
I have spent the last two days looking for the correct plug to use and everywhere I go, there are different suggestions. I have an 06 ob xt and the manual states, the "recomended plug" is the NGK ILFR6B. When I search for that plug at different vendors, it comes back not compatible. On the LGT and NASIOC forums they suggest different plugs. I am looking for the stock replacement, not one step colder. Before I order the wrong plugs I am looking for some info. Are the NGK silfr6a the correct plugs? Whe does the manual suggest different? Will the correct plugs come with the proper gap?
flat4underpressure is offline  
Sponsored Links
Advertisement
 
post #2 of 20 (permalink) Old 02-24-2013, 10:59 PM
Registered User
 
Join Date: Jan 2013
Location: Northern California
Car: 1993 Legacy LSi with still functioning Air Suspension, 1999 Outback 2.5L 5MT lab Rat
Posts: 191
Feedback Score: 0 reviews
try NGK SILFR6B
SubyTechJoe is offline  
post #3 of 20 (permalink) Old 02-24-2013, 11:53 PM
Moderator
 
cardoc's Avatar
 
Join Date: Aug 2012
Location: Austin, Texas
Car: 2001 VDC/SC One of a Kind
Posts: 10,420
Feedback Score: 2 reviews
It boils down to and NGK iridium with a heat range 6. NGK 6481 at your local parts store. Denso equivalent is SK20HR11 or 3421. Either one the plug to use.
cardoc is offline  
post #4 of 20 (permalink) Old 02-25-2013, 12:28 AM
Registered User
 
1 Lucky Texan's Avatar
 
Join Date: Jan 2004
Location: behind the Krell Metal door
Car: 03 H6 OBW & 06 WRX Sportwagon
Posts: 7,882
Feedback Score: 0 reviews
is -11 the right gap for an xt ?

Time Flies Like an Arrow,
Fruit Flies Like a Banana!
1 Lucky Texan is offline  
post #5 of 20 (permalink) Old 02-25-2013, 07:43 AM
Moderator
 
cardoc's Avatar
 
Join Date: Aug 2012
Location: Austin, Texas
Car: 2001 VDC/SC One of a Kind
Posts: 10,420
Feedback Score: 2 reviews
Quote:
Originally Posted by 1 Lucky Texan View Post
is -11 the right gap for an xt ?
11 is not the gap.

NGK Spark Plugs USA Technical

NGK Spark Plugs USA FAQS

On this last link, click on the Spark Plug Guide for a part number break down.

Look around the site. It might have something on it you didn't know before.
cardoc is offline  
post #6 of 20 (permalink) Old 02-25-2013, 08:58 AM
Registered User
 
DavidPeab's Avatar
 
Join Date: Apr 2012
Location: Pasadena, MD
Car: Little Red, 2000 Outback H4 "Limited"
Posts: 2,407
Feedback Score: 4 reviews
Hold on there partner. Modern plugs come pre-gapped. Many folks think it can't hurt to double check with a gauge. The problem is that using a gauge to gap the plugs can scrape of the coating, like iridium, from the contacts, degrading the plug's performance at running temps.

I've always used NGK for my Japanese cars. IMHO stay away from Bosch.
DavidPeab is offline  
post #7 of 20 (permalink) Old 02-25-2013, 09:41 AM
Registered User
 
1 Lucky Texan's Avatar
 
Join Date: Jan 2004
Location: behind the Krell Metal door
Car: 03 H6 OBW & 06 WRX Sportwagon
Posts: 7,882
Feedback Score: 0 reviews
according to the globaldenso site, that Denso plug is pre-gapped at 0.044 (1.1mm, thus -11)


DENSO SPARK PLUGS



the NGK NGK SILFR6B is pre-gapped at .032 I think (0.8mm)

also, the NGK 6481 is not listed for his car(though, it may work fine - I dunno) at the NGK parts finder. The Iridiums which are listed, both show a gap of 0.30"; http://ngksparkplugs.com/part_finder...uv/results.asp

Time Flies Like an Arrow,
Fruit Flies Like a Banana!
1 Lucky Texan is offline  
post #8 of 20 (permalink) Old 02-25-2013, 09:49 AM
Registered User
 
1 Lucky Texan's Avatar
 
Join Date: Jan 2004
Location: behind the Krell Metal door
Car: 03 H6 OBW & 06 WRX Sportwagon
Posts: 7,882
Feedback Score: 0 reviews
Quote:
Originally Posted by DavidPeab View Post
Hold on there partner. Modern plugs come pre-gapped. Many folks think it can't hurt to double check with a gauge. The problem is that using a gauge to gap the plugs can scrape of the coating, like iridium, from the contacts, degrading the plug's performance at running temps.

I've always used NGK for my Japanese cars. IMHO stay away from Bosch.
co-worker just had a bad experience with Bosch in his daughter's Camry, I told him to get NGK and now it's running fine.

I think I'd avoid Bosch, too many anecdotal failures to risk it.

Time Flies Like an Arrow,
Fruit Flies Like a Banana!
1 Lucky Texan is offline  
post #9 of 20 (permalink) Old 02-25-2013, 10:47 AM
Registered User
 
Join Date: Oct 2012
Posts: 5
Feedback Score: 0 reviews
Quote:
Originally Posted by flat4underpressure View Post
I don't want to start a thread on "how to", this is about spark plug selection.
I have spent the last two days looking for the correct plug to use and everywhere I go, there are different suggestions. I have an 06 ob xt and the manual states, the "recomended plug" is the NGK ILFR6B. When I search for that plug at different vendors, it comes back not compatible. On the LGT and NASIOC forums they suggest different plugs. I am looking for the stock car accessories replacement, not one step colder. Before I order the wrong plugs I am looking for some info. Are the NGK silfr6a the correct plugs? Whe does the manual suggest different? Will the correct plugs come with the proper gap?
I am not completely sure but you need to try eBay site to get right plug..
Theelm is offline  
post #10 of 20 (permalink) Old 02-25-2013, 11:12 AM Thread Starter
Registered User
 
Join Date: Feb 2013
Posts: 10
Feedback Score: 0 reviews
See, with just these few posts, confusion. SILRF6B is not the same as SILRF6A? FCP import and another site recommend SILRF6A. I want the OEM plugs. Car did not come with denso or Bosch but NGK (Japanese). I am just wondering on why the different NGK numbers especially from what the maintenance Manuel recommends?
flat4underpressure is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Subaru Outback - Subaru Outback Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Rate This Thread
Rate This Thread:



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome