[Spridgets] Iridium Plug Question

[CosmicMag1380]

On Thu, Apr 15, 2010 at 5:26 AM, Larry Daniels <ladaniels at sbcglobal.net>
wrote:
What do y'all think of Iridium spark plugs?  My brother asked me about
them for his airplane.

He has a flat six motor with a second, redundant ignition system.  So,
12 plugs at $7.40 ea. and he changes them every 100 hours.  It gets
costly.  Are iridium plugs worth the extra cash?

A couple of thoughts come to mind... My GM cars came with iridium
plugs and the service interval is "inspect at 100K, replace as
necessary". I have never "had" to replace them but I did at 50K just
because I wanted to. That being said, iridium plugs are reliable. A
good thing for an airplane. Because your brother's life depends on the
engine running well. the price of the plugs should not be a factor!

If I am correct, a redundant ignition system on an airplane engine
only fires one or the other system (6 at a time not all 12 plugs
firing) when the engine is running. If so, suggest to him to replace
the primary set with the iridium plugs and keep the standard plugs in
reserve as he always has...

--
Kent
1960 Bugeye
1967 Sprite - following in the 73's footsteps to the boneyard...
1969 Midget - just a shell of its former self