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Old 06-11-2013, 09:35 AM   #1
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indexing and filing spark plugs

Back in the day, we used to "index" the spark plugs so that the opening would face down toward the piston so that as much of the spark as possible would ignite the A/F. We would also"file" the sides of the electrode so that, assumably , some of the spark would fire around the electrode.

Do you think this would be worth the effort on our FoFo's? Below is a link to an article if you need more info.

http://dodgeram.info/Engine-Gas/Spar...0_indexing.htm


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Old 06-11-2013, 10:36 AM   #2
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Been there done that :P

Can't really index the plugs properly without inserts and an different plug length. I did file down my original plugs to be side firing and maybe it helped, but hard to tell. Seemed to fire about the same.
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Old 06-11-2013, 10:39 AM   #3
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Quote:
Originally Posted by TCOC rel1 View Post
Back in the day, we used to "index" the spark plugs so that the opening would face down toward the piston so that as much of the spark as possible would ignite the A/F. We would also"file" the sides of the electrode so that, assumably , some of the spark would fire around the electrode.

Do you think this would be worth the effort on our FoFo's? Below is a link to an article if you need more info.

http://dodgeram.info/Engine-Gas/Spar...0_indexing.htm
Not sure if it would be worth it since I don't think we have a 'squish' area and the plugs go straight into the center of combustion chamber like a Hemi, did anyone index plugs on the 426 Hemi?
Now then a gap-less plug like BRISK LGS or BOSH +4 might do a little.
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Old 06-11-2013, 10:41 AM   #4
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In the stratified fuel/air charge environment of a DI cylinder, it's not likely that indexing or profiling will help at all. And, obviously, you can't face the electrode toward the piston in a DOHC engine like this, since the plug is centered vertically at the top of the cylinder. I suppose you could try to index so the electrode faces the injector, but that's not likely to be worth the effort.
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Old 06-11-2013, 10:44 AM   #5
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Yeah, the gains for indexing on this type of engine might be null. I bought some new stock plugs but still have my cut ones I can take pics of.
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Old 06-11-2013, 11:52 AM   #6
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The reason for indexing Spk Plugs is to locate the wire of the plug so the dome on the piston would not hit it , then some one got the idea this should be done on all engines , like most things people put to much thought into turns out the only reason to index a plug is to keep it away from dome pistons

If you want to expose more of the kernal (which is the theory behind indexing) then us the Autolite AR series plugs these give you the fastest kernel growth and exposure then any other plugs

Tom
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