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Generation III External Engine
LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories

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Old 09-15-2010, 07:48 PM   #1
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Default Worst Spark Plug You've Ever Seen?

So im pulling apart the car for a forged 383 since I spun a bearing, and after pulling the heads off I noticed the #8 piston looked noticeably worse compared to the others. After taking the spark plugs out of the heads I noticed one just isn't right and found out the owner before me who I bought the car from replaced 1-7 with NGK TR-5's and never replaced 8 so it was running on a stock AC delco for 110k miles Let me just say pictures do NOT do it enough justice. The plug is completely pointed on the tip and just bad in every way possible.

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Click the image to open in full size.
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Sorry about the bad quality of the pics, camera sucks
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Old 09-15-2010, 07:58 PM   #2
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even my stockers when i changed them out at 120,000 looked better than that
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Old 09-15-2010, 09:20 PM   #3
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Nah, that's not the worst I've ever seen. Try having a nitrous backfire...then you will truly know what a bad plug looks like

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Old 09-15-2010, 09:21 PM   #4
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Blurry pics FTW!
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Old 09-15-2010, 09:27 PM   #5
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No pics of it, but I changed the stock AC Delco plug out of #8 with about 80,000 miles on the car. If it had an electrode left, I couldn't see it.
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Old 09-15-2010, 09:39 PM   #6
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wow that nitrous one is horrible haha, makes me feel at least a little better about running that plug for a few months
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Old 09-15-2010, 10:56 PM   #7
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Nah. It's not the worst unless the electrodes are missing. S2000 I did years ago ate two of them. Shortblock was fine, minor scuffing on the valves and no pieces to be found. Bizarre, what the F are the odds of something like that finding it's way out the exhaust valve without damage LOL. Twice!
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Old 09-15-2010, 10:57 PM   #8
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The precious metal (iridium/platinum) have VERY small electrodes - and are made to go to 100,000k, theoretically, for emissions reasons I guess. They still like to be swapped out before for optimum performance.

http://www.spark-plugs.co.uk/pages/t...park_plugs.htm
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Old 09-15-2010, 11:09 PM   #9
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i'm looking for a picture of one of mine, but it was when i installed lt's. when i put the driver's side in, i ended up hitting the back one and it split all the way down one side on the ceramic part. took me about a week to figure out why it was idling so rough.
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Old 09-15-2010, 11:13 PM   #10
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Quote:
Originally Posted by The_Rizzle View Post
The precious metal (iridium/platinum) have VERY small electrodes - and are made to go to 100,000k, theoretically, for emissions reasons I guess. They still like to be swapped out before for optimum performance.

http://www.spark-plugs.co.uk/pages/t...park_plugs.htm
+1 one the difference in electrodes... and shame on the those people that are too lazy to change #8 spark plug.
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Old 09-15-2010, 11:58 PM   #11
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making me wonder if i need to change my stockers..
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Old 10-01-2011, 01:35 PM   #12
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Sorry about the clear photo!!

154,000 miles on this plug, Corolla I bought new in 97.
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Old 10-01-2011, 01:45 PM   #13
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^wow....
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Old 10-01-2011, 01:53 PM   #14
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You just compared an irridium plug to a copper plug????
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Old 10-01-2011, 02:21 PM   #15
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Click the image to open in full size.

The plugs that were in my car when I got it. New plug on the right.
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Old 10-01-2011, 02:28 PM   #16
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Click the image to open in full size.

The plugs that were in my car when I got it. New plug on the right.

Two of those look completly fouled!
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Old 10-01-2011, 04:58 PM   #17
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Quote:
Originally Posted by Rhauwen View Post
The plug is completely pointed on the tip and just bad in every way possible.
That made me lol. It's SUPPOSED to look like that.
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Old 10-05-2011, 03:35 AM   #18
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This thread is major fail.
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Old 10-05-2011, 08:03 AM   #19
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^^what they said man, thats the original iridium/ platinum plug (i forget which they came with) but ya its supposed to be narrow and pointed like that for a better spark the new plugs you got are just regular copper plugs they are still good but in theory getting the original iridiums are better
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Old 10-05-2011, 11:54 AM   #20
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Quote:
Originally Posted by 01ssreda4 View Post
That made me lol. It's SUPPOSED to look like that.
pretty much sums it up...
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Old 10-05-2011, 11:54 AM
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