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Old 10-14-2009, 08:51 AM
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Tippy
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Originally Posted by RF5BPilot
The plugs on my airplane (and most of the ones I've seen) have two grounds that need to be gapped.
I researched Champion and Autolite, they have 4 ground strap plugs too for aviation.

Last edited by Tippy; 10-14-2009 at 03:29 PM.
Old 10-14-2009, 08:52 AM
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Oh and guys, its ground straps, not electrodes when it comes to single or multiples. Plugs only have one electrode.
Old 10-14-2009, 09:11 AM
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Originally Posted by Tippy
Oh and guys, its ground straps, not electrodes when it comes to single or multiples. Plugs only have one electrode.

An electrode is a conductor through which electric current is passed.

Therefore,, there is both a center electrode and ground electrode on a spark plug. If both were not electrodes, the plug would not work.
Old 10-14-2009, 10:23 AM
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Originally Posted by peavynation
I read some interesting things on multi-electrode plugs that bares mentioning here too:

1) Depending on the head design and sparkplug location, multielectrode plugs can actually disturb the combustion gas flow adversely degrading performance. Not sure if this would apply to the P-head design.

2) The extra metal of three more electrode can absorb and retain more heat, thus increasing chance of detonation.

Food for thought. I say use what P recommends.
Porsche recommends the Beru 4-conductor plugs, according to Loren, so that's what I ordered (@ $13 per)! Hopefully these plugs will work well - I would hate to have to replace them twice!
Old 10-14-2009, 11:32 AM
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Originally Posted by 1999Porsche911
An electrode is a conductor through which electric current is passed.

Therefore,, there is both a center electrode and ground electrode on a spark plug. If both were not electrodes, the plug would not work.
Yes, but when the term "electrode" is used, most would think the center in my circles.

That's where the companies focused the most attention to like the platinum plugs.
Old 10-14-2009, 11:39 AM
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Originally Posted by Tippy
Yes, but when the term "electrode" is used, most would think the center in my circles.

That's where the companies focused the most attention to like the platinum plugs.

The industry's official name of what you call the "grounding strap" is "ground electrode" From Champion to Bosch. You need to move outside your "circle" more often.
Old 10-14-2009, 12:15 PM
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Originally Posted by 1999Porsche911
The industry's official name of what you call the "grounding strap" is "ground electrode" From Champion to Bosch. You need to move outside your "circle" more often.
HAHA, gotta change all the other mechanics minds too in these parts.
Old 10-14-2009, 01:01 PM
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Have fun changing those plugs! It's close to time to change mine again and I'm not looking forward to it. Just make sure you have lots of patience and no place to drive the car for a least a few hours. Magnetic socket and extensions/swivels are a good idea also.
Old 10-14-2009, 01:09 PM
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Originally Posted by pat056
Have fun changing those plugs! It's close to time to change mine again and I'm not looking forward to it. Just make sure you have lots of patience and no place to drive the car for a least a few hours. Magnetic socket and extensions/swivels are a good idea also.
I bought the recommended KD swivel socket set w/ magnets - I'm ready!! I figure I'll do the plugs with the car in the garage, so it can be worked on in stages, even if it's night or raining outside.

Last edited by AndyK; 10-15-2009 at 07:40 AM.
Old 10-14-2009, 01:09 PM
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Originally Posted by 1999Porsche911
The industry's official name of what you call the "grounding strap" is "ground electrode" From Champion to Bosch. You need to move outside your "circle" more often.
Haa! You guys are pretty funny. I can see both sides of your stories, and being an EE, I should have been super specific and said "multi ground-electrode".

I need to do this soon too. What's this magnetic socket I keep hearing about? I assume Suncoast or Pelican has it?
Old 10-14-2009, 01:36 PM
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Originally Posted by peavynation
Haa! You guys are pretty funny. I can see both sides of your stories, and being an EE, I should have been super specific and said "multi ground-electrode".

I need to do this soon too. What's this magnetic socket I keep hearing about? I assume Suncoast or Pelican has it?
Check it out here:

http://www.tooltopia.com/index.asp?P...D&ProdID=28433
Old 10-14-2009, 03:06 PM
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Originally Posted by pat056
Have fun changing those plugs! It's close to time to change mine again and I'm not looking forward to it. Just make sure you have lots of patience and no place to drive the car for a least a few hours. Magnetic socket and extensions/swivels are a good idea also.
Drop the exhaust cans and the plugs are cake to change.
Old 10-14-2009, 03:07 PM
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Originally Posted by peavynation
Haa! You guys are pretty funny. I can see both sides of your stories, and being an EE, I should have been super specific and said "multi ground-electrode".
When I hear 4-electrode, I think of 4 center electodes.
Old 10-14-2009, 03:26 PM
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Originally Posted by RF5BPilot
The plugs on my airplane (and most of the ones I've seen) have two grounds that need to be gapped.
I checked with Champion who I saw mostly and they offer 4 ground strap plugs. Autolite makes 4 ground strap plugs too.
Old 10-14-2009, 05:58 PM
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Which takes longer, dropping the exhaust cans or fighting the plugs? As I remember, my problem was the extension wanted to let go of the socket, leaving me with the socket attached to the tightened spark plug. That was a real pain.
Once all the skin was off my elbows and knuckles, the physical pain wasn't that bad.


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