Ditto here. I replaced the bottom plugs with fine wire early last
summer. I have about 75 hrs on them, and fouling has totally
disappeared. No more burn-offs at mag check. When I had earlier put in
new massives on the bottom, they started fouling soon thereafter.

Bruce Cunningham
N30464 C177A


Peter R. wrote:
Google shows that this question last appeared here in 2001.
Therefore, I
wanted to pose it again in the event there might be more anecdotal
data
since then.

Are there benefits to replacing massive electrode spark plugs with
fine
wire spark plugs?

Background: I have a turbo-normalized IO-520 in the Bonanza that
runs lean
of peak at cruise, an operation recommended by the turbo system's
manufacturer, Tornado Alley. This type of operation requires
absolutely
clean spark plugs and a well-maintained ignition system, otherwise
engine
roughness will occur.

Since the TA Turbo was installed, both the previous owner and I have
had
the massive electrode spark plugs cleaned, gapped, and rotated every
100
hours. However, after reading the 2003 Aviation Consumer article I
am now
wondering if I would be better served by installing fine wire spark
plugs.

Given the large cost difference between the two types of plugs, I am
interested in reading others' experiences.

--
Peter