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texastomeh
Samba Member
Joined: November 20, 2018
Posts: 302
Location: Dallas, TX
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 Posted: Sat Dec 05, 2020 12:02 pm Post subject: "Indexing" Spark Plugs???? |
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Guys,
While doing quite a bit of general internet searching in conjunction with threads here on the Forum re CHT sensor location, I ran across a lot of "information" about "Spark Plug Indexing" on other types of engines.
Out of curiosity, I did some searches here and didn't find anything.
Since several very knowledgeable and respected guys on here seem to have strong (and often/usually differing) opinions on anything and everything pertaining to an engine setup, I was wondering what the consensus is with regards to "Spark Plug Indexing" when it comes to VW engines.
Not trying to be a TROLL, but am curious as to what you guys think.
Thanx and stay well, my friends!! 
Tom
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A new engine build won't solve ALL of life's problems - only those THAT REALLY MATTER!!!
GETTING old was GREAT - BEING old SUCKS!!
Too bad that the guys that know how to solve all of the WORLD's problems are too busy working on old Volkswagens!! |
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UK Luke 72
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Joined: September 07, 2011
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 79739
Location: Sneaking up behind you
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| Posted: Sat Dec 05, 2020 12:06 pm Post subject: Re: "Indexing" Spark Plugs???? |
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Pretty hard to do on #1 and #3 on a engine with dual carbs.
And harder if the plug has multiple electrodes.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
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עַם יִשְׂרָאֵל חַי |
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vwracerdave
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Joined: November 11, 2004
Posts: 15601
Location: Deep in the 405
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| Posted: Sat Dec 05, 2020 12:50 pm Post subject: Re: "Indexing" Spark Plugs???? |
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Not worth the time for the very tiny fractional amount of difference it makes in horsepower or fuel economy.
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oprn
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Joined: November 13, 2016
Posts: 14890
Location: Western Canada
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| Posted: Sat Dec 05, 2020 12:58 pm Post subject: Re: "Indexing" Spark Plugs???? |
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| I would expect that multiple electrode plugs would not benefit at all from indexing but thier very nature. |
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Pruneman99
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Joined: February 22, 2012
Posts: 5013
Location: Oceanside
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| Posted: Sat Dec 05, 2020 1:08 pm Post subject: Re: "Indexing" Spark Plugs???? |
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| Unless you really need that 1 extra HP at the end of the track, I would not bother. But there would be no harm in it. I don't think the indexing washers are very expensive. |
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APPLEGREENVW
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Joined: November 30, 2003
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Howard 111
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APPLEGREENVW
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Joined: November 30, 2003
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texastomeh
Samba Member
Joined: November 20, 2018
Posts: 302
Location: Dallas, TX
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| Posted: Sat Dec 05, 2020 6:13 pm Post subject: Re: "Indexing" Spark Plugs???? |
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INTERESTING!!
www.youtube.com/watch?v=96ih4pdu1Nc
Thoughts??
Tom
_________________
A new engine build won't solve ALL of life's problems - only those THAT REALLY MATTER!!!
GETTING old was GREAT - BEING old SUCKS!!
Too bad that the guys that know how to solve all of the WORLD's problems are too busy working on old Volkswagens!! |
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 23225
Location: Oklahoma City
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| Posted: Sat Dec 05, 2020 7:19 pm Post subject: Re: "Indexing" Spark Plugs???? |
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Uh.....why not just buy a sparkplug that is set up for "side gapping"....there are many of them. The triple electrode plugs like the NGK BP6ET and Bosch W7DTC...are not only multiple electrode so dont care about index...they are already side gap plugs.
From what I have been told....for the most part....plug electrode index can come into play mainly on VERY high compression/high rpm engines.....where the AF swirl pattern is extreme....and ignition of the mixture at insane speeds can benefit from the electrode gap facing the AF charge in exactly the right way. Its more about reliability.
Think top fuel or any engine with very high boost forced induction....and its mainly about reliability.
As others have noted....nit really necessary for about 99.9% of VW's.
But the triple plugs are great for certain engine combos.
You can see close up pictures of the side gaps both new and used to see the wear pattern in this thread
https://www.thesamba.com/vw/forum/viewtopic.php?p=9244285&highlight=#9244285
Ray |
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oprn
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Location: Western Canada
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