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12-24-2011, 01:31 AM
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#1 |
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Registered User
Join Date: Aug 2009
Location: PA
Posts: 883
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spark plug indexing?
ive been hearing alot of mixed thoughts on this lately.
if indexing spark plugs makes a difference or not. so let me ask some of you before i think about about doing it or not. is it worth it? what gains are there, if any? should the ground strap be in the 12 oclock position or 6 oclock position? we index the plugs in the race car, but thats because it has big dome pistons... for clearance, not for performance gains... well at least thats what i thought. maybe im missing something. fill me in, id like to know more about this. thanks |
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12-24-2011, 01:58 AM
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#2 |
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Registered User
Join Date: Dec 2008
Location: NW-Ohio
Posts: 2,525
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Re: spark plug indexing?
You can index both plugs and cap n rotor
 
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12-24-2011, 09:22 AM
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#3 |
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Account Suspended
Join Date: Dec 2011
Location: ma
Posts: 278
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Re: spark plug indexing?
on a street car you'll never notice it.. but at the track you'll see it in e.t
I've always wonder what would happen if you cut the ground off and welded on a washer that the hole was the gap you wanted.. it have a larger area than the ground strap, and not need indexing.. |
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12-24-2011, 11:59 AM
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#4 |
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Registered Truck Offender
Join Date: May 2008
Location: hells training ground (aka Ariz)
Posts: 3,118
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Re: spark plug indexing?
I found nothing on the dyno or on the track with being overly anal about indexing on a small closed chamber head like a SBC AS LONG AS the spark kernel wasn't shouded by the ground strap. I mean there is about 180° there that is ALL WRONG for sure, but I havent found any measurable proof at the 797 n/a HP level that there is any 3HP in spark plug indexing,, and believe me,, we looked and looked for those last 3 HP
But that's just my combination,, your results may vary.
__________________
Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral. |
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12-25-2011, 02:06 AM
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#5 |
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Dino burner
Join Date: Nov 2002
Location: Calgary, Alberta, Canada
Posts: 602
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Re: spark plug indexing?
Like Marv, I haven't found any notable difference on the dyno or dragstrip to make indexing spark plugs worthwhile.
However, I do have to index my plugs because of the size and shape of the dome of my pistons and how close they come to the heads. In other words, if the ground straps are in the wrong position, the piston can kiss them and close up the gap. |
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12-25-2011, 05:01 AM
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#6 |
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Account Suspended
Join Date: Dec 2011
Location: ma
Posts: 278
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Re: spark plug indexing?
I've found when you spray.. it makes a diffence..
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12-25-2011, 11:36 AM
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#7 | |
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It's Better With Nitro
Join Date: Apr 2008
Location: Chino Hills, CA
Posts: 2,261
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Re: spark plug indexing?
Quote:
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1963 C-10: Deluxe-optioned cab, shortbed, fleetside Pontiac 462 ci, Kauffman D-Port alum. heads 4L80E, narrowed sheetmetal Ford 9-inch Tubular front and rear suspension Custom 6-piston front disc and 4-piston rear disc brakes |
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12-29-2011, 03:52 PM
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#8 |
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Registered User
Join Date: Aug 2009
Location: PA
Posts: 883
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Re: spark plug indexing?
does the ground strap go in the 6 o clock or 12 o clock position?
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