Fine wire plugs - pro & con?

I'll stick my neck out....

During our annual in July, many of our plugs showed signs of wear... oval
center electrodes and excessive gaps. We debated about what to do...
replace the worst ones with massive electrode plugs, replace all of them
with massives, or replace all of them with fine wire. We talked it over
with a couple GA A&P/IA's and a couple of our A&P/IA's in the crop dusting
business.

The GA mechanics said save the $$ and go with massives, rotate and clean
them often, we always have them in stock, we'd have to order the fine wires.

The aerial applicator mechanics said go with the Iridium fine wires and
you'll have less fouling, the gap will never change, keep them rotated,
they'll be the last plugs you ever buy. They run them in all of their
piston engines, very rairly foul them, and normally only change them at
overhauls. They also buy them in bulk and sold us a set of 24 for less than
1/2 the normally advertised price. Sold. Iridium's installed, saved and
cleaned the best of the massives.

Jim



"Paul kgyy" wrote in message
oups.com...
I'm possibly having to replace a set of plugs; what are the pros/cons
of using fine wire types? I know they are more expensive, but what do
you get in return for the cost?