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The Platinum 4+ have always fouled on me, or caused knocks/timing issues.

Thats in all 3 of my cars, the 525i's and the 635csi
 

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Bosch super 4 differ from platinum plus 4 in the construction of the center electrode. Super 4 has a silver plated center electrode whereas platinum plus 4 uses a sintered platinum rod. Electricity always follows the path of least resistance....they NEVER fire to multiple points. Both plugs use surface air-gap technology. This technology differs from air gap and surface gap technology of old in that the spark can "select" either an air gap or can "glide" over the insulator nose as it sparks. When conductive particles (carbon) exist on the insulator nose they become the path of least resistance. The four electrodes surrounding the center electrode allows the spark to occur wherever the least resistance is found. Should deposits start to build up, they are conductive, and therefore the spark is directed through them and thereby improving the cleaning of the plug. Surface air-gap "glide" is an advantage primarily during cold starts. All spark plugs given correct heat range are self-cleaning once the engine warms up. Surface air-gap technology is not a gimmick as evidence by its use in nearly all 2004 BMW models...ie FGR7DQP. Download the bosch plug catalog from this site for more info.

http://www.bosch.com.au/content/language1/html/2265.htm
 

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Originally posted by billB+Nov 24 2004, 04:33 PM--><div class='quotetop'>QUOTE(billB @ Nov 24 2004, 04:33 PM)</div><div class='quotemain'>Beelz
Since you saying So it in effect chooses the best electrode to arc from at that moment in time.   It means also they don't fire all at once (as some tend to believe)
My question is this: can one conclude based on the above that the +4 has some cleaning (self cleaning???) effect?? i.e. firing from one arc tends to prevent buildups on the idling/off arc in that moment of the cycle? or this is asking too much of a plug??
regards
billb
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<!--QuoteBegin-carguy
@Dec 7 2004, 03:48 AM
Bosch super 4 differ from platinum plus 4 in the construction of the center electrode.  Super 4 has a silver plated center electrode whereas platinum plus 4 uses a sintered platinum rod.  Electricity always follows the path of least resistance....they NEVER fire to multiple points.  Both plugs use surface air-gap technology.  This technology differs from air gap and surface gap technology of old in that the spark can "select" either an air gap or can "glide" over the insulator nose as it sparks.  When conductive particles (carbon) exist on the insulator nose they become the path of least resistance.  The four electrodes surrounding the center electrode allows the spark to occur wherever the least resistance is found.  Should deposits start to build up, they are conductive, and therefore the spark is directed through them and thereby improving the cleaning of the plug.  Surface air-gap "glide" is an advantage primarily during cold starts.  All spark plugs given correct heat range are self-cleaning once the engine warms up.  Surface air-gap technology is not a gimmick as evidence by its use in nearly all 2004 BMW models...ie FGR7DQP.  Download the bosch plug catalog from this site for more info.

http://www.bosch.com.au/content/language1/html/2265.htm
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Carguy you are more than :welcome :welcome to our forum and it seems someone answered the cleaning effect question above. Wonder if it is a Bosch marketing strategy? or in fact it does reflect reality?
Best regards
billb
 

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Not Self Cleaning

Beelz
Since you saying So it in effect chooses the best electrode to arc from at that moment in time. It means also they don't fire all at once (as some tend to believe)
My question is this: can one conclude based on the above that the +4 has some cleaning (self cleaning???) effect?? i.e. firing from one arc tends to prevent buildups on the idling/off arc in that moment of the cycle? or this is asking too much of a plug??
regards
billb
Merely it has 4 ground posts to toss the single spark at, if one of the posts gets carboned up it will choose the least path of resistance meaning it will always go to the cleaner post, and with 4 to pick from they last longer due to these extra posts carbon build up is created by deposits left by the sparks negative\positive contact points so the 4 post offer more area to toss a spark at. Its One Spark Only, But 4 receptors.
 
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