We see advertisements everywhere trying to sell us different types of spark plugs that all look different but claim the same thing, better fuel economy and more power. These are the faces of those plugs.
We start at the copper plug. The original spark plug.
Copper is an excellent conductor of electricity but doesn't offer the life of most other plugs and needs changed every 15k miles. From what I've seen in my plug comparison photos of the plugs working under pressure, this plug doesn't offer any bigger spark than other metals with less conductivity.
A few copper variants have hit our market, the Chinese didn't like the low lifespan of copper and they created a plug that I don't think ever made it to mass production but looks interesting enough.
We've all seen the splitfire.
Not many of us have seen the Halo plug though.
Or the E3 plug.
A few designs have taken the idea of getting a nice and open path to the combustion chamber just a little bit further.
A company in Mexico makes(made) this Technica plug. I've been unable to find them for sale online.
The Torquemaster Plug is available online at a few places. This type of plug uses the surface-gap discharge method. Surface-gap gets its benefits because the spark takes less voltage to travel a long distance over the surface of the plug then it does to go through the air. This gives you more spark exposure area.
A surface-gap discharge plug that is also long life is the Bosch Platinum +2 and 4 plugs.
Then you have your typical Platinum plug.
And your Iridium.
Finally, you have the Pulstar plug. This plug differs from the plugs above by incorporating a peaking capacitor into the plug.
dkjones96 
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