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Old 11-22-2011, 01:25 AM   #2 (permalink)
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Join Date: Jul 2009
Location: New York
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no nickname , it's just a car - '04 volkswagen golf tdi
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easiest path to ground

there will not be spark at both electrodes , the spark will take the single easiest pathway to ground ,
which may vary as the gap erodes and conditions inside the combustion chamber change .

spark plugs with two and more electrodes were OEM specified by many , including VW Audi , Toyota - there was a difference in how the engines ran and overall emissions if the OEM recommendation / specification for spark plugs was not strictly adhered to .

on later current production VWs at least
the newest systems use only single electrodes , with multi strike spark

having said that
never use Bosch Platinum +4 or +2 spark plugs , they were never OEM specified for any system and do not perform as well as
the correct OEM specified part# for the system in question

Originally Posted by Piwoslaw View Post
I read about Denso's TT spark plugs in a mag the other day and the principle seemed OK: The spark jumps between two tips, both have smaller than usual diameter which supposedly allows lower voltage, etc. Then the claims: Increased power, 5% lower fuel consumption. Yeah, right.
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