Date:         Fri, 9 Aug 2002 22:21:53 +0000
Reply-To:     Jfp w/3 WBXs <jfp7@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Jfp w/3 WBXs <jfp7@HOTMAIL.COM>
Subject:      Re: spark plugs, etc
Comments: To: poll7356@UIDAHO.EDU
Content-Type: text/plain; format=flowed

Hi Matt,

Regarding the multible spark plug electrode issue, I have a question. If the
purpose of a spark plug is to produce a hot(as possible)current spark to
ignite the fuel and air mixture, why would it be better to have 3 less
dynamic arcs for current flow??? Resistance is specifically engineered into
the secondary igition system to cause the ignition coil to "grunt" as the
primary circuit is broken and the coil magnetic field collapes. Parallel
circuitry lowers or reduces the circuit resistance and thus reduces the
intensity of the "snap" of the coil's spark discharge by providing lesser
amp multible paths to ground.

I believe that the only useful, intended purpose of multible spark plug
electrodes is to provide additional ground paths when the primary pathway
becomes too wide, usually because the plugs have been left in the engine for
~50,000 miles. This allows for extended service intervals thus lowering the
cost of ownership. This attitude is reflected in the present day extended
oil change intervals of 7,500 - 10,000 miles. I personally remove my spark
plugs every 15,000 miles, clean, regap or replace them and check the
compression so I have no use for multible electrode spark plugs.

Considering Ohms law, multible electrodes and their parallel circuits would
produce a "weakened" spark arc over several ionized pathways compared to the
"lightening bolt" produced when all the ignition coil dynamics are funneled
into one pathway to ground.

Matt, whadayathink?

Regards,      John

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