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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-621035@logan.com>
Subject: Re: [FlyRotary] FW: Re: Plugs and Mags
Date: Tue, 25 Jan 2005 11:02:35 -0500
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Mark,

I have not used the iridium plug - the reason is I am using Platinum plugs
and come nowhere  close to wearing them out before replacing them.  The
problem is not so much wear as SAG (SparkPlug Attention Getter), that
appears to be caused by fouling on the ceramic cone causing leakage of the
spark pulse before it builds sufficient voltage to jump the gap.  Using
100LL they will foul in 25-30 hour of running, using MoGas Tracy Crook gets
over 100hours.  Using 100LL the fouling is apparently caused by lead
deposits building up on the cone and with Mogas its carbon deposits.

I have save the plugs thinking I will clean them off and reuse them - but
the normally cleaning ( blasting) will probably cause more wear than usage.
Been looking for some solvent that would dissolve lead deposits without
eating the spark plug metal - have not found it yet.

Not certain that reciprocating engines have the same problems as their plugs
are not as shrouded as ours so combustion process probably help keeps
blowing off deposits on the ceramic center cone.

FWIW

Ed A

----- Original Message -----
From: "Mark R Steitle" <mark.steitle@austin.utexas.edu>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, January 25, 2005 10:18 AM
Subject: [FlyRotary] FW: Re: Plugs and Mags


I'm forwarding a message from the Lancair list concerning iridium spark
plugs.  They're saying that they last 2,000 hours in their certified
engines.  Has anyone tried these in the rotary?  Are they even available
for the rotary?

Mark S.

<snip>
Subject: [LML] Re: Plugs and Mags

I have been using iridium plugs for about 500 hours and they haven't
needed to be adjusted yet. I am told that they will last over 2,000
hours.
<snip>

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