Spark Plugs???? - NoPistons -Mazda Rx7 & Rx8 Rotary Forum

2nd Generation Specific 1986-1992 Discussion

Spark Plugs????

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Old 02-12-2003, 10:59 PM
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I have replaced the spark plugs with the same ngk's that it had, it had 2 spark plugs 7eq and two 9 eq now it had on the top 2 the 7 eq and the bottom 2 9 eq is this the proper way they go ? which are the leading and trailing ? Im new at rotaries so throw me a bone give me a run down.
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Old 02-13-2003, 01:25 PM
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Welcome to the forum.... that's correct, leadings (7's) on top, trailings (9's) below them.
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Old 02-13-2003, 01:29 PM
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one more thing... some people run 9's on all four, they are a bit colder plug and will last longer. I'm not sure how that affects ignition though.
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Old 02-13-2003, 01:31 PM
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i ran 9's on all 4 never had any problems
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