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Old 12-30-2010, 09:07 PM
thechad66 thechad66 is offline
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Default Indexing spark plugs

I saw something on one of the Powerblock shows where they had a spark plug socket with a open space on the side (kind of like a O2 sensor socket.) They said that it makes it easier to index your plugs 'cause you can see the indexing mark. This got me thinking....

My question is, does anyone on here index their plugs?
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Old 12-31-2010, 10:06 AM
sgtsandman sgtsandman is offline
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Default Re: Indexing spark plugs

What the heck is indexing your plugs??? Never heard of such a thing.
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Old 12-31-2010, 10:13 AM
01_ranger_4x4 01_ranger_4x4 is offline
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Default

Some people index there spark plugs to direct the spark to a cirtain spot in the combustion chamber to increase performance. They do so using plug spacers and an o2 socket so they know where the plug is oriented. I highly doubt it would be worth the trouble of doing all that with our trucks but when engine builders are trying to squeeze every bit of power out of an engine that's one of the things that some of them do.

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Old 12-31-2010, 10:31 AM
pooleo pooleo is offline
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Default Re: Indexing spark plugs

so you could theoretically use the +4 plugs to eleminate any need to make the spark fire a certain way....?

Perhaps this is why the +4's are claimed to be more effecient/powerful, it basically automaticly index's your plugs....?
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Old 12-31-2010, 01:13 PM
Bird76Mojo Bird76Mojo is offline
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Default Re: Indexing spark plugs

Quote:
Originally Posted by pooleo View Post
so you could theoretically use the +4 plugs to eleminate any need to make the spark fire a certain way....?

Perhaps this is why the +4's are claimed to be more effecient/powerful, it basically automaticly index's your plugs....?

Not true because the spark is gonna jump to whichever electrode it wants to. Whichever is the path of least resistance.


Indexing the plugs wouldn't do anything to our trucks performance wise. As a previous poster explained, only racers do it to squeeze every last little bit of power out of a built engine.


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Old 12-31-2010, 03:29 PM
mickblock mickblock is offline
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Default Re: Indexing spark plugs

Quote:
Originally Posted by pooleo View Post
so you could theoretically use the +4 plugs to eleminate any need to make the spark fire a certain way....?

Perhaps this is why the +4's are claimed to be more effecient/powerful, it basically automaticly index's your plugs....?
Nah, these designs would actually be frowned upon by proponents of indexing. Their theory is that if the open side of the electrode faces the incoming air/fuel charge, the flame front will begin to spread before the it becomes slightly turbulated by the electrode post. practical in engines with machine work done if anything.

The air flow in today's engines has some real rocket science behind it without even getting into indexed plugs. Even the evaporation rate of the gas that hits the wall of the cylinders is taken into account.
If indexing had any merit in OE engines, I'd think it would be incorporated. That'd be my opinion of course.

I'm still gonna index the plugs in my truck so I can pretend to feel the difference though.
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