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Old 08-30-2010, 04:56 PM   #1
BYRDMAN
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Anybody Index thier spark plugs?

Was talkin to a guy at work who does this to his Harley, he said ppl have been doing it for ages but I never heard of it till he explained what it was.

Anybody take the time to index thier spark plugs?

For those who have no clue like me earlier today, Indexing the spark plugs is facing the open side of the electrode towards the intake chamber so that the air/fuel is sprayed directly onto the open end of the spark plug to supposedly get full or more effecient ignition.....

Urban legend or does it work
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Old 08-30-2010, 04:59 PM   #2
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On a cylinder head with a large combustion chamber and only 2 valves there MAY be a benefit.
On any modern 4 valve head? No.
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Old 08-30-2010, 05:02 PM   #3
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I do it to my Harley every time I finish my weekend ride along with adding 3 quarts of oil.




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Old 08-30-2010, 05:02 PM   #4
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Quote:
Originally Posted by Patrick View Post
On a cylinder head with a large combustion chamber and only 2 valves there MAY be a benefit.
On any modern 4 valve head? No.
Werd I figured with the engineering of inline-4s and having 2 sets of injectors , the way air and fuel is mixed in the chamber for optimal combustion already

He did say it was a trick from back in the day (muscle car era) and he does it on his Harley (which should of been my first indication that its pointless)
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Old 08-30-2010, 05:05 PM   #5
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I agree with Patrick. And I run the EK plugs which don't need indexing.
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Old 08-30-2010, 07:17 PM   #6
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Split Fire plugs win win...Lol
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Old 09-06-2010, 11:27 AM   #7
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i always cut the ground strap back, but i never waste my time indexing them.
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Old 09-06-2010, 11:33 AM   #8
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eh we get that from customers trying to build up their BMWs and M3 owners...

My response is always "if the 4+ electrodes on a performance engine do not restrict the ignition of the cylinder, what is one little electrode gonna do?"

some of the sparkplugs built now have collars over the sides of the electrodes so the spark can only ignite mixtures directly below it.... Its an initiated burn so only takes one spark(and we're talking 100s of a second for the whole burn to take place.)
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