Running all 9's...
Well, we all know (or should know) about trailing and leading plugs
I've heard from a couple people with rotary knowledge that running 9's will be 'safer' and last a little longer than running with 7's in the leading holes what benifits can be seen from running all 9's? Basically what are the pro's and con's? thanks for the insight -Markus |
Bump.. i am talking about spark plugs here guys, it's not rocket science, i'm just confused. is running all NGK 9's better?
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I was told by a mechanic who specializes in these cars that the 9 and 7 is the heat rating of the plug so he runs all 9s which is a colder plug. So I don't see any con's to this, pro's would probably be less detonation prone. Next change I'm going to try it out.
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I thought the 9s were a hotter plug? :confused: If they are a colder plug, then read above^.
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9's are colder than 7's
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so would running all 9's be 'safe' in an N/A Rx-7 running intake / exhaust?
Thanks - Markus |
Colder plugs are more prone to fouling if you're running too rich. If you're running stock or near stock power levels, you should just stick with the stock configuration.
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I don't think you'll need to run 9's unless you're making serious power... ~400hp up. For the N/A that's pretty much impossible so the 7's will be fine for just about any application
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anytime you're mixture is leaned from stock such as with an AFC you should run 9's all around to be more detonation resistant. just like with a piston engine if you're making hotter more violent combustion (running leaner) colder plugs give you a safety margin.
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dude DONT do it there was the same # plugs in my car when i got it, it ran like sh*t!! go with the NGK 9s on top and NGK 7s on bottom trust me it will run alot better!! they r both the same price so u mys well do it the right way!! PEACE!!
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