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1. 08:04 PM - Re: Spark Plugs - Fine Wire Safety Warning (Brock Windsor)
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| Subject: | Re: Spark Plugs - Fine Wire Safety Warning |
io-550.
------------------------------
On Sat, Dec 24, 2011 11:42 AM CST Gary Vogt wrote:
>what engine is in the SR-22?
>
>I think the change to RHB29E is a guess. Plug runs cooler. I don't think they
know the failure mode.
>
>If the SR-22 has angle valves, well, it's an entirely different animal.
>
>
>________________________________
> From: 923te <923te@att.net>
>To: teamgrumman-list@matronics.com
>Sent: Saturday, December 24, 2011 8:48 AM
>Subject: TeamGrumman-List: Spark Plugs - Fine Wire Safety Warning
>
>
>
>I've been looking for reasons why my plane isn't as fast as it used to be.
>Maybe I found something.
>
>I found a MSB concerning fine wire plug failures from Tornado Alley
>turbo:
>http://www.taturbo.com/TATSR22-SB11-05%20fine%20wire%20spark%20plugs%20initial%20release%20sept%2023%202011.pdf
>
>Beechtalk has a thread on this issue where they mention that NA or Normally
>aspirated engines have the same failure with fine wire plugs.
>http://www.beechtalk.com/forums/viewtopic.php?f=37&t=59668&hilit=fine+wire
>
>In addition, Tempests' new advertising campaign lists acceptable resistance
>of spark plugs as :
>
>500 - 3000 ohms = New - Good
>500 - 5000 ohms = Used - Good
>>=5000
>ohms = No Good-Hard Starting-Misfire-Poor Combustion
>ref.: http://www.electroair.net/pdf/SparkPlugCard.pdf
>
>So I pulled my Champion REM38S fine wires to look for broken
>ceramicand measured resistance:
>No broken ceramic but resistance was very high.
>
>Plug Resistance k-ohms
>
>Cyl
>Top
>Bottom Bottom
>1
>29.8
>68.9
>Oily
>2 No
>Continuity
>2.8
>Dry
>3
>5.75.9Oily
>412.933.7
>Oily
>
>Spare 19.16 Spare was removed becaused it kept fouling
>
>If Tempest resistance values apply to Champion plugs then all my plugs are
>bad One plug had no continuity at all. Resistance measured while cold ~ 35 deg
>F.
>The engine used to bust right off, starting first blade. Last year or so of
>flying it was hard to start and would misfire when loading up, ie when keeping
>WOT and lowering RPM
>all pointing to a possible igniton problem.
>
>New plugs going in. Hope to be flying again next week and we'll see how it
>does with new plugs....and a straight=======================
>=====
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