Okay, some proven facts:
- Platinum is a superior electrode metal - it lasts longer and fires more efficiently.
- This applies to both electrodes - especially in a waste-fire system.
- Fine wire plugs provide better spark at less voltage, and increase performance and reduce wear.
So with fine-wire single plats, people get better performance than the double plats, with very near the same life. However, the same plug that fires through a second platinum electrode will last even longer, and should provide even better spark. The non-plat electrode on my fine-wire single-plats was worn .006 - .008 after 20k (on one bank only), and my double-plats after 20k were still .054. This is enough proof for me that if I want to keep a perfect gap for the life of the plug, double-plat is the way to go.
Life:
single plat < fine wire <(barely) double plat < double plat fine
Performance:
sinlge plat < double plat < fine wire < double plat fine
