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Old 03-23-2007, 12:45 AM   #21
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Red -

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Originally Posted by Red View Post
The logic doesn't make sense, that one plug fires normally while the corresponding plug fires in reverse? Whats the point?

The Jeep uses a "waste spark" ignition as well with the coils wired in parallel not in series like that thread seems to suggest and I've noticed no difference in wear or drivability when I switched from copper plugs to double platinums.
I think this was a big debate over at saturnfans, but the "waste spark" argument seemed to prevail. I haven't experienced bad performance either, but my Densos start looking foul, I will swap some NGKs in and see what happens.

Just throwin' it out there,

CarloSW2
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Old 11-10-2007, 10:11 PM   #22
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HALO Plugs

I realize this is several months after the forum discussion, but I've recently been searching for new plug/products. I found an online source for HALO spark plugs. Apparently they've been around since the early 90's. Their design differs from that of a conventional plug in that instead of an "L" shaped electrode (or multiple ones on triple fires etc...) they have a circular "halo" which allows the combustion to shoot through instead of having what they term a quenching effect produced by the "L's." Have you read anything about them. Their website indicates increased performance in HP, mileage and especially emissions - but why wouldn't it?
Dan
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Old 11-12-2007, 06:29 PM   #23
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hefeled -

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Originally Posted by hefeled View Post
I realize this is several months after the forum discussion, but I've recently been searching for new plug/products. I found an online source for HALO spark plugs. Apparently they've been around since the early 90's. Their design differs from that of a conventional plug in that instead of an "L" shaped electrode (or multiple ones on triple fires etc...) they have a circular "halo" which allows the combustion to shoot through instead of having what they term a quenching effect produced by the "L's." Have you read anything about them. Their website indicates increased performance in HP, mileage and especially emissions - but why wouldn't it?
Dan
I don't know if they work, but here's two threads on Halo plugs :

Halo sparkplugs - 11-28-2005, 07:07 PM
http://www.gassavers.org/showthread.php?t=263

Halo Plugs - 08-31-2006, 10:56 PM
http://www.gassavers.org/showthread.php?t=1646

And here's some Halo's on ebay :

Halo Plug B-GR17YC-3 Save Gas/Fuel, Reduce Emissions!
http://cgi.ebay.com/ebaymotors/Halo-...spagenameZWD1V
... http://stores.ebay.com/Greenplugs

Here's the parent site, but they're not selling them anymore :

http://www.haloplug.com
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November 1, 2007

We have decided to cease selling the Halo Spark Plug as of November 1, 2007. For now, you may check out www.lsgbrisk.com to consider purchasing.

Thanks to all our thousands of former customers.

Roger Gibson
CarloSW2
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Old 11-21-2007, 04:46 PM   #24
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just a sidetrack note: i always thought their was 2 spark plug sizes. the 08 sentra uses super tiny plugs, i think 14mm. i can't fit my pinky finger in the hole spark plug hole. dam now i got to buy a 3rd spark plug socket to add to my collection.
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Old 08-06-2009, 06:33 AM   #25
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BUMP!!!

four years later, is there any clear-cut winner on spark plugs. i kinda fancy the idea of moving away from the traditional "L" shape electrode.
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Old 08-06-2009, 07:27 AM   #26
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I had sidegapped plugs in Marvin and I did notice more gap erosion. Check 'em yearly if you do that. Cold idle wasn't too good with them, but they seemed to give better torque.

I custom made a halo principle plug, but I couldn't seem to get it to fire any better than a normal plug so ditched that idea... involved bending up the electrode, hammering it flatter and wider, then drilling a large hole in it, then bending it back...

Might try the "magic plug mod", modified halo style or modified sidegap again, looking for something that throws spark forward more, because my plugs are stuck away at the side. If they don't seem to spark good outside the engine though, I don't even try installing them. Might make a simple test rig with a spare coil.

Got an idea for an "ion cannon" type plug but don't have a way to robustify it enough to survive combustion, which is the whole point...
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Old 03-13-2010, 08:14 AM   #27
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Sanity Check

I am mostly an arm chair technical type. I am contributing this from some actual scientific data & personal experience along with concept & conjecture.
So here goes.

1. It seems to me that one should not modify a premium plug like this as the electrodes have been plated/treated with precious metals. The exposed base metal may shorten plug life.

2. If it was so simple to gain this much benefit from a simple modification like this, would not the plug manufacturers save millions of $ in materials and produce "side gap" plugs ready to use?

3. How come most of the tests performed on spark plugs by the automotive experts indicate little or no benefit to various fancy gap designs? Could the plug makers be taking advantage of our neurosis?

4. How can focusing only on the spark be of benefit with OBDII computer controlled ignition systems? The computer analyses many engine parameters to optimize the combustion chamber efficiency. It will let you know what is not working with the help of an OBDII scan tool.

5. Would older non-computerized ignition systems perform better with fancy gap designs?

Finally. My theoretical knowledge of the sciences indicate that the spark you observe from fiddling with a test plug outside the combustion chamber is NOT the spark that actually occurs in the chamber. A combustion chamber is at an extremely high pressure with a mixture of fuel and air at spark time that may significantly quench the spark.

OK - So here is the little experience I have with plugs as follows:
My vehicles range in age and engine capacities from late 80's/6 cylinder to late 90's/8 cylinder. For all my vehicles, regular gapped premium plugs sold in supermarkets were consistently better performing & lasted longer than the exotic gapped plugs from various plug makers.

Gentlemen - Start your computers!
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Old 06-11-2010, 09:08 PM   #28
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Is there any chance that diamondlarry could put his research data back up? They are missing and I would like to study them.
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Old 06-12-2010, 01:22 PM   #29
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send him a PM. he's a great guy, and enjoys helping others!
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