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Q:
I am considering replacing my massive electrode
plugs with fine wire electrode plugs. Do you have
any feedback from members or words of wisdom relating
to: performance increases, longevity of plugs, ability to
run lean of peak, etc.?
A:
The main difference between the massive and fine
wire plugs is the cost and longevity. The average
cost of the massive plug is $27 and the fine wire is $95,
which is approximately three times the cost.
In normal operation, massive plugs will last about 250 - 300
hours and fine wire will last about 750 - 800 hours, which
is not quite three times as long. From a cost point of view
they are approximately the same.
In the operational area, we are seeing some problems
after the fine wire plugs get some hours on them. They begin
to cause a high power miss when operating LOP. Most of
the time just a simple cleaning will correct the problem, but
on some occasions the plug will need to be replaced. We
don’t see this problem with the massive plugs.
As far as operating issues, they will provide the same
performance and if the engine is operating normally, the
www.bonanza.org
Fine-wire spark plugs
Mike Nickeson, Maquoketa, Iowa
fine wire will last somewhat longer. Sometimes the fine
wire plugs are a little harder to find if you need one replaced
due to the fact most shops do not keep them
in inventory due to the cost. —BR
Q:
Heat damage to wing panel
Gerald Casey, Anchorage, Alaska
While removing fuel from the right fuel drain to
defuel the aircraft a static spark started a fire. The
seven-gallon fuel jug fell over and ran under the left wing.
The aircraft was pulled from the fire. There is bubbled
paint under both wings near the wing root. There is also
some heat damage to the left fuselage skin above the
wing where the heat rose. How do you determine which
skins need to be replaced?
A:
Any skin that shows signs of heat damage needs
to be replaced since the strength of the metal
cannot be determined . —DH
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66 AMERICAN BONANZA SOCIETY JANUARY 2013