dumb question on plug #s - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 16 (permalink) Old 08-19-2006, 08:31 AM Thread Starter
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dumb question on plug #s

i know this is a dumb question, but i gotta ask! if the bike has only 2 cylinders then why does it have 4 spark plugs?
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post #2 of 16 (permalink) Old 08-19-2006, 09:20 AM
 
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It has 2 per cyl.
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post #3 of 16 (permalink) Old 08-19-2006, 09:34 AM
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It is set up with two plugs per cylinder for better, cleaner firing.. The spark ignites milliseconds from each other , like bambam.. bambam.. with the second igniting any leftover gas

Dianna
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OKVROC # 18 (H)
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post #4 of 16 (permalink) Old 08-19-2006, 02:30 PM
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And there you go, good explination Dianna

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post #5 of 16 (permalink) Old 08-19-2006, 07:11 PM
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The real reason for the 2 extra plugs is that they balance the charge of the other plugs. When you pump 5-10 thousand volts through a plug, it creates a negative charge in order to fulfill the laws of energy conservation. Similar to when you drop something in water, the water will fill in where it was displaced, and shoot back up some. If it wasn't for the law of energy conservation (lec), the water would fill in and flatten out, without a splash. Then anybody would be able to make an olympic dive. Anyhow, the secondary plug fires right after the first one, to eliminate the negative backwards energy, thus fulfulling the lec in a way such as to produce the least amount of heat/damage to the coils. As an added benefit, it also burns some extra fuel that did not combust, although the time between the two sparks is very small. Also, due to little inefficiencies, such as resistances in the wire and coil, the second plug will not fire as powerfully as the first.

This is why most engines are an even number of cylinders.

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post #6 of 16 (permalink) Old 08-19-2006, 10:03 PM
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Two plugs per cylinder

Once had an 84' Nissan Pickup that had two plugs per cylinder, it was
considered one of the best engines Nissan ever made.

On that engine I was told that one plug was at the intake and the other
at exhaust...Nap Z engine.

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post #7 of 16 (permalink) Old 08-20-2006, 11:29 AM Thread Starter
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thank you, vulcan460, for that simple answer. thank you, Dianna, for the better explination. thank you cegodsey, for your (mind blowing/overkill) explination. that made my head hurt!
thanks all'
ruger
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post #8 of 16 (permalink) Old 08-20-2006, 05:02 PM
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Sure thang, man. Mine wasn't real, but it sounds plausible, don't it?

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relocated R/R
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post #9 of 16 (permalink) Old 08-20-2006, 05:11 PM
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No Cegodsey.. I got my waders out when I started reading yours *L*
Remember the story about the little boy that cried WOLF! Pretty soon no one believed him..

Dianna
Conway, AR
Patriot Guard Rider
2000 VN750 Sere (Serendipity)
1990 GL1500 (Ole Blue)
1986 VN750 EVie (project bike, heavy custom)
VROC # 11628 / 25000-H
ARVROC # 12 Coordinator and Crowd Control
OKVROC # 18 (H)
TNVROC # 45 (H)
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post #10 of 16 (permalink) Old 08-20-2006, 06:43 PM
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Haven't heard that one.

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relocated R/R
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