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Old 12-23-2011, 09:03 AM   #1 (permalink)
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Default Spark Plug Gap 2010 2.5L non turbo

I'm changing my sparkplugs for the first time on my 2010 O/B 2.5L, non-turbo.

Bought some Bosch plugs, presume their gaps are correct but would like to be certain. The manual has no info on the gap measurement (or little else for that matter regarding specifications).

Please provide the gap and any suggestions to ease the replacement.

Thanks and Merry Christmas
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Old 12-23-2011, 11:19 AM   #2 (permalink)
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I suggest not using Bosch plugs. NGK.

GApp on the older models was .40 I believe.
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Old 12-29-2011, 07:53 AM   #3 (permalink)
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Isn't it under your hood on the emissions decal? I thought it was required by law to be there.
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Old 12-30-2011, 11:53 PM   #4 (permalink)
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.039-.043 in per FSM. Just curious how many miles your at that you are changing plugs already on a 2010? BTW Plugs come factory gapped and Bosch does not recommend regapping as the ceramic that protects the center electrode is too easily damaged. That being said, as others have posted, go with the NGK.
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Old 12-31-2011, 09:23 AM   #5 (permalink)
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34000 miles, BTW, what a headache getting the spark plugs out, had to stop because my sp socket wouldn,t hold the plug tight enoughr to slide it out of the "cavaren"
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Old 06-01-2012, 10:00 AM   #6 (permalink)
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Quote:
Originally Posted by AWDFTW View Post
I suggest not using Bosch plugs. NGK.

GApp on the older models was .40 I believe.
Are there technical reasons why I shouldn't go with Bosch plugs? Specifically I'm looking at their new Fusion model
Bosch IR Iridium Fusion Spark Plugs at BoschSparkPlugs.net

Everyone says to go with NGK but other than it's OEM, are Bosch plugs that bad?
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Old 06-01-2012, 01:23 PM   #7 (permalink)
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My understanding is this, after years of messing with plug designs the traditional single ground and electrode design is the best because it is ideal to maximize the air space around the electrode as anything else gets in the way of the flame that develops around the electrode when the spark plug ignites the fuel.

Platninum is used for electrodes for two reasons, longer life (because its harder), and because they can make a thinner electrode which allows a better spark and igniting because there is more air space. Iridium is even tougher which allows them to make the electrode even smaller which allows for even better igniting.

The Bosch plugs break with these ideals in two ways.

1. The 4 ground paths just get in the way of the air space of the igniting fuel. Bosch will argue its increases longevity of the plug, that is why most manufactures put a platinum plate on the ground to accomplish a similar result with out decreasing airspace. You will see this with double platium plugs and long life iridium plugs

2. The Bosch electrode is surrounded by an insulator so this further inhibits ignition and does not even allow for design of a super small electrode which is the main point of using iridium. I think Denso plugs have a .4mm electrode tip and NGK's have a .6mm tip.

I would go with NGK or denso

Here are some real world Dyno results of various spark plugs. They do not test Bosch though.

http://www.sparkplugs.com/sparkplug4...Results&mfid=0
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Old 06-01-2012, 03:02 PM   #8 (permalink)
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I see , that's great info. What about the NGK laser iridium plugs vs the stock laser platinum? Local shop here has a better price on the iridium ones because apparently there is some kind of agreement with Subaru to keep the laser platinum ones more expensive. :shrug:
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Old 06-01-2012, 03:07 PM   #9 (permalink)
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NGK Laser platinum is platinum electrode with platinum pad on ground
NGK Laser iridium is iridium electrode with platinum pad on ground
NGK Iridium IX is iridium electrode with regular ground (cheaper than laser iridium, shorter life)

Laser iridium is better than Laser platinum. All newer Subarus comes with Laser Iridium.
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Old 06-01-2012, 04:02 PM   #10 (permalink)
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Great, thank you. Laser Iridium it is.
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