2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

spark plug q and a

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Old Nov 14, 2012 | 07:29 PM
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hsilive's Avatar
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rotory chicken
 
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spark plug q and a

ok so if anyone has any info to post about plugs do it here

as i learn more i will be making a complete how to and knoweldge base but so far im not that informed

im using nkg "cheap plugs that require a gap

i hear anything from .040 to .050

what should i really use ?

im running a ls ignition system too
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Old Nov 14, 2012 | 07:33 PM
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Uh as far as I know NGK only makes gapless plugs for our cars because regular plugs would stick pretty close to the combustion chamber. I'm not a pro on this though...
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Old Nov 14, 2012 | 07:37 PM
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rotory chicken
 
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true but alot of people use the gapable plugs rather then the aviation style plugs just cant find a for sure gap for them our plugs stick into holes in the housing reg plugs should not go in so deep thats why i havent just picked up a set i do have lots of gapless plugs but they are all 1200 miles away at home
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Old Nov 16, 2012 | 07:48 PM
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Originally Posted by hsilive
ok so if anyone has any info to post about plugs do it here

what should i really use ?
Here you go. Reccomended plugs and gap.

Rotary Tech Tips: Tachometer & Spark Plugs

Make sure you have the right "gapable" plugs as you can't just stick any plug that will thread in the hole in there or they will(on the leading) stick out through the housing into the chamber and cause catastrophic damage when the apex seal hits it.
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Old Nov 16, 2012 | 08:00 PM
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unless you have a big turbo (non bolt-on) use OEM plugs
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Old Nov 16, 2012 | 08:05 PM
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turbo rotaries run a bit rich, requiring less gap to prevent ignition "blowout". for copper core plugs i would run them at .037-.040". that is still a rather large gap but those plugs aren't situated in the combustion chamber and need a little help igniting the compressed air/fuel.

iridiums and platinum plugs have to be used with their preset gaps, if you try to gap them you will likely damage the plating and the plugs will wear/foul very quick.

surface discharge plugs are best but there is no colder plugs than the 9EQ in that type for our engines.

Last edited by RotaryEvolution; Nov 16, 2012 at 08:09 PM.
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