A FYI:
AutoLite Spark Plug discussion And.....The problem that Bosch has acknowledged when using their Platinum plugs in engines with waste spark ignition systems stems from the tendency of electrode metal to get transferred depending upon the polarity (direction
of current flow) of the spark. In waste spark ignition systems, 1/2 of the plugs always see reverse polarity sparks. Given the very narrow platinum center electrode of the Bosch Platinums, performance will be degraded more
significantly when reverse polarity sparks will cause material to be transferred from the large ground/outer electrode onto the narrow platinum center electrode's exposed end surface.
In cars with conventional (1 coil) ignition systems, every spark is of the same polarity, for which the Bosch Platinums are optimized, leaving them to deliver their designed-in advantages, which include:
o reaching self-cleaning temperature faster ("than any other plug")
o maintaining the spark gap and low firing voltage requirement throughout their service life. (even in my high-stress turbocharged application)
