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Sparkplug to coil location

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Old Apr 17, 2007 | 05:00 PM
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Sparkplug to coil location

OK, I need to know If the top middle coil goes the the left (front) spark plug or the right (back )spark plug?
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Old Apr 17, 2007 | 05:30 PM
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Both leading plugs fire at the same time, so it doesn't really matter. Do it however your particular wires run best.
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Old Apr 17, 2007 | 05:32 PM
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How would they both fire the same if the rotors turn at different times?
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Old Apr 17, 2007 | 05:47 PM
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Originally Posted by M14socom
How would they both fire the same if the rotors turn at different times?
"the leading plug fires a second time late in the power stroke, which is called a "wastespark". The wastespark is done to simplify the ignition system by allowing both leading plugs to be fired "on the same channel" (one coil, one signal) . Basically, both leading plugs always fire at the same time, so there is an extra (wasted) spark during the power stroke."

from rotary engine illustrated website

http://www.rotaryengineillustrated.c...gnition-9.html
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Old Apr 17, 2007 | 05:51 PM
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Thanks every thing is clear now.
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Old Apr 17, 2007 | 06:08 PM
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Sure, I always wondered why myself and this gave me a reason to look it up.
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Old Apr 17, 2007 | 06:19 PM
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Does this mean the spark plugs go bad quicker than they should be if fired separately?... Sorry I am assuming that the life of Spark plug is set by the number of times it can fire. Correct me if i am way off~
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Old Apr 17, 2007 | 07:30 PM
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yea it would effect life span ,thats why they need cleaning after2,5k,also does anyone no if its ok to run all 9s on a pretty much stock motor?
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Old Apr 17, 2007 | 07:35 PM
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Originally Posted by goz
yea it would effect life span ,thats why they need cleaning after2,5k,also does anyone no if its ok to run all 9s on a pretty much stock motor?
They need cleaning sometimes because of carbon buildup. Firing isn't a big deal... if it were, the trailing plugs would be less worn because they don't have a "waste spark" and the leading do.

If the trailing plugs had a waste spark, they would pre-ignite the next combustion step.
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Old Apr 17, 2007 | 08:20 PM
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cleared that up nice one and what about runnin all bur9 plugs ?
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