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The NGK Spark Plug Thread

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Old 02-08-2010, 09:55 PM
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cool thanks scott -i didnt wanna do it anyway
Old 02-10-2010, 12:32 PM
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Originally Posted by caddy03pimpin
OEM plug AC Delco Iridium 41-985 ( .040" gap)
Just to let you know the new the new part number from GM is 41-110 it use to be 41-985. Just a little FYI.

Great information Scott!
Old 02-10-2010, 05:24 PM
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How about adding the recommended gap for boost and nitrous.
Old 02-10-2010, 05:40 PM
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Good info Scott!
Old 02-10-2010, 10:00 PM
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Originally Posted by tarinitup
How about adding the recommended gap for boost and nitrous.
That's pretty subjective honestly.
Old 02-10-2010, 10:28 PM
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Hey can you post the gaps for duramax's too! I couldn't find anything using the search. Also I think pictures of each plug number would actually make this thread useful.
Old 01-04-2011, 08:34 PM
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Was that a joke or you serious?

Diesel doesnt use SPARK plugs they use GLOW plugs due to the fact they are compression ignition and not spark ignition. They use the compression of the ar in the cylindars to generate the heat for the combustion, the GLOW plugs of course are there for emmissions/milage(by providing a complete burn) and to make cold starts easier among other things.

Is there any way yall can add into this thread or the original post what plugs to use for the different stages of builds I.E. cam/cam and heads/cam heads LT's exhaust and CAI Ect. Ect. due to the heat ranges to better help folks make a decision. I know different heat ranges yield themselves better to different set ups and what not and yo dont want a plug thats to cold or hot for your app.

Just askin cause it may be too broad of a spectrum to cover.

Last edited by That Other Guy; 01-04-2011 at 08:40 PM.
Old 01-04-2011, 10:44 PM
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Originally Posted by SLOXCAB
i bought some ngk plugs and they came pre gapped .040 should i regap to ..060?
what about splitting the difference and going with .050"?
Old 01-04-2011, 10:49 PM
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Originally Posted by That Other Guy
Was that a joke or you serious?

Diesel doesnt use SPARK plugs they use GLOW plugs due to the fact they are compression ignition and not spark ignition. They use the compression of the ar in the cylindars to generate the heat for the combustion, the GLOW plugs of course are there for emmissions/milage(by providing a complete burn) and to make cold starts easier among other things.

Is there any way yall can add into this thread or the original post what plugs to use for the different stages of builds I.E. cam/cam and heads/cam heads LT's exhaust and CAI Ect. Ect. due to the heat ranges to better help folks make a decision. I know different heat ranges yield themselves better to different set ups and what not and yo dont want a plug thats to cold or hot for your app.

Just askin cause it may be too broad of a spectrum to cover.
I'm pretty sure he was joking since he put the smiley after his post.

Also, FYI, not all diesels have glow plugs (a good example is the Cummins used in the Dodge Ram), and they are only used for cold start-ups.


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