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What Spark Plugs are people using for Top/Bottom and what ig

 
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Ray.R.Doerr(at)sprint.com
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PostPosted: Tue Jul 31, 2007 7:36 am    Post subject: What Spark Plugs are people using for Top/Bottom and what ig Reply with quote

I now have almost 300 hours on my RV-10 and it was time to look into maybe a better plug to use for the bottom set. I talked to Unison at Osh and they had thought the Unison UREM37BY would be a good fit since it had the extended electrode for the bottom plugs. I then looked at an Service Instruction publication http://www.lycoming.textron.com/support/publications/service-instructions/pdfs/SI1042Y.pdf on Lycoming web site for Approved Spark Plugs and they did not list the 37BY as an approved plug. So now I have ordered the Unison UREM38S which are the uridium fine wire plugs at $44 each. They by the way were listed as approved plugs. Currently I have UREM38E on both top and bottom with Slick Mags on both sides, this is how it came from America’s Aircraft Engines.
Anyway I will try the new iridium plugs on the bottom and see how they perform. Does anyone have any idea on how long the dirrent plugs should last in our RV-10’s?

On a different note, I have also destroyed one EGT probe that came from Dynon. I have 6 EGT probes and my #2 cylinder was telling me it was > 1550 when the others were around 1400 while running LOP. I knew something was not right so I swapped the EGT probes in the #2 and #4 cylinders and went flying. Guess what, now the #4 cylinder was hotter than the rest by 150 degrees. So now I know that the EGT is faulty. Both probes look the same and I was wondering if cleaning them somehow will help. I posted a message on Dynon’s board and then thought that getting 200 – 300 hours on an EGT probe while running LOP was about right. They said they have always thought of EGT probes as consumables. First off, I would think that running LOP would be easier on the probe since the EGT are down because of reduced power. Can anyone share there experiences on EGT probes and there expected life?




Thank You
Ray Doerr
40250
N519RV (Hobbs 292)

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