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dlm34077
Joined: 10 Feb 2007
Posts: 115
Location: AZ
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 Posted: Sat Aug 21, 2010 2:38 pm Post subject: Egt probes (GRT) |
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Another probe failed this morning. That makes 5 failures in 310 hours TTSN. This cylinder has not failed earlier so it was probably the lower quality probe. I will swap it out next week with an Electronics International to determine whether they are a better solution. They claim that the probe will last 2000 hours. My EGTS are operated usually between 1200-1420 F. For brief moments during leaning, some may range from 1420-1450 but are immediately brought under 1420 with mixture control. My usual cruise provides EGT range from 1375-1420. Yet probes have failed five times: cylinders 1(once), 2(twice), 6 (once) and now 3. Four failures occurred between 200-300 hours TTSN. I am installing an EI P-110; I had EI engine instrumentation for my Glastar and in 530 hours had no failures of either EGT or CHT probes.
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Sat Aug 21, 2010 4:08 pm Post subject: Egt probes (GRT) |
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I don't recall the exact hours in service, but have had no failures on
the fast response EI EGT probes on my 200hp Mooney running cruise EGTs
in the 1350-1500 range, mounted exactly 1.5" from the cylinder flange of
exhaust stack. Installed them several years ago. Only failures have been
a couple leads/connections from the probes, easily fixed with new
connector and crimper.
On 8/21/2010 3:34 PM, DLM wrote:
| Quote: | Another probe failed this morning. That makes 5 failures in 310 hours
TTSN. This cylinder has not failed earlier so it was probably the
lower quality probe. I will swap it out next week with an Electronics
International to determine whether they are a better solution. They
claim that the probe will last 2000 hours. My EGTS are operated
usually between 1200-1420 F. For brief moments during leaning, some
may range from 1420-1450 but are immediately brought under 1420 with
mixture control. My usual cruise provides EGT range from 1375-1420.
Yet probes have failed five times: cylinders 1(once), 2(twice), 6
(once) and now 3. Four failures occurred between 200-300 hours TTSN. I
am installing an EI P-110; I had EI engine instrumentation for my
Glastar and in 530 hours had no failures of either EGT or CHT probes.
*
*
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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