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Unread 10-13-2009, 03:33 PM   #1
Diamond-x
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1991 XJ Cherokee 
 
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Spark plug indexing

I don't want to start a discussion about 'which' spark plug to use, just how to.

So......

I saw on Powerblock TV where they indexed the plugs so the curved tip was open to the piston. They did this by removing the plug, marking where the electrode connected to the threaded end and made sure that the mark pointed straight up when re-installed. Theoretically, this would allow a better spark to ignite the cylinder. Without interference from the plug itself.

It's little tricks like this that racers have been using for years.

It's my thought that this would probably have a positive effect on ignition, granted minimal at best.

Your thoughts?

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Unread 10-13-2009, 03:35 PM   #2
leftlanetruckin
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not worth nearly the effort involved on a regular motor.

Martin
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2000 4.7 4WD WJ with a rebuilt motor.
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http://www.jeepforum.com/forum/f12/swap-offically-underway-324622/

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Unread 10-13-2009, 04:09 PM   #3
Diamond-x
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Well I do run a stroker, that might be worth some extra effort. and we do own Jeeps so we're used to wrenching on them.
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Unread 10-13-2009, 04:12 PM   #4
leftlanetruckin
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Quote:
Originally Posted by Diamond-x View Post
Well I do run a stroker, that might be worth some extra effort. and we do own Jeeps so we're used to wrenching on them.
sorry, been there and done it.......3 frame off rebuilds on my last rig, along with motor swaps etc. now i just enjoy driving and wheeling them!
i still seriously doubt you will gain anything with indexing the plugs, but go ahead and try if it floats yer boat!

martin
__________________
1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.The Cherylkee....
2003 Range Rover HSE, 4.4 Quad Cam.
1998 Range Rover 4.6 HSE
2000 4.7 4WD WJ with a rebuilt motor.
4.3/700r4/new frame buildup (YJ)....
http://www.jeepforum.com/forum/showthread.php?t=324622

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Unread 10-13-2009, 05:27 PM   #5
Carves
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Quote:
Originally Posted by Diamond-x View Post
It's my thought that this would probably have a positive effect on ignition, granted minimal at best.

Your thoughts?

Its not something I would bother with either, however ... "minimal" improvements and a few of them together can add up to major improvements in a situation ... which might be handy for those lookng foe a little bit more.

One of the plug companies was making plugs without the electrode and the core was recessed so there was a 360' arcing area ... no aligning nescessary.
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Unread 10-13-2009, 08:17 PM   #6
dacotua
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I honestly believe indexing your plugs on a car with less than 500 horsepower is a waste of time. You won't even see 1 horsepower improvement. Its like the old K&N Filter ads... (Just install one of these and see up to 15 horsepower gain...) What they didn't tell you, is they stuck a paper filter on a engine that had over 500 horses, then the K&N, which on a highly modified motor, gained 15 horses.
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