I am an engineer. Just not the right kind. Though I do work with electronics, for wireless chipsets not for cars.

A capacitor in the spark plug could increase the energy of the spark by a factor of ten. But it would do it by storing energy for some period and then generating a bigger spark. Depending on details (i.e. how many farads of capacitance) this could be a big delay. (Big in engineering terms -- micro to milliseconds.) Not being an engine designer I don't know if that size of delay would matter or not.

There was a link above to an article that showed a power increase for different spark plugs including this one. But I would be interested in seeing what the increase was after a longer period, they showed three runs (cold, warm, hot) with decreasing power for each. How long does this continue? Wast the hot run at steady state temperature or still warming up the engine? And does it vary based on engine? (i.e. is the best plug in an Evo the best plug in a Porsche?) Does the plug with the highest cold horse power still produce more power when steady state temperature is reached or are you better off with one with lower cold horse power? Like most horse power adders, a lot more objective testing is required to prove what is/isn't achieved.

Being a chicken $%^& I doubt I will be the one to find out. I'll let someone do a long term test before I'll try them. (Of course the first step is getting a CS, hopefully next spring.)

- Dan