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werner schneider
Joined: 24 May 2021
Posts: 58
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 Posted: Mon Jun 07, 2021 2:11 pm Post subject: EGT issues hwo to troubleshoot best |
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Hi there, I changed a few years ago from a Rocky Mountain engine monitor with selector switch to a Dynon EMS 10 engine monitor. The probes from the RM monitor have long leads back into the cockpit and a braided steel cover around the wires. The wires are crimped to D-sub pins and end in a DB25 plug. due the braided steel covers all is a bit tight at the d-sub plug. I had an erratic CHT at the begin but a reseat in the plug solved that mystery. But I had from the begin EGT4 acting up below 200 deg F it has very little differences from the 3 others (see pictures) but above the curve flatens significantly.
After all the years living with that error and trying with icebath, boiling water etc to no avail I would like to dig a bit deeper.
Does anybody have a good plan how to tackle this as the error shows up only on a running engine.
At 2 mins you see the runup, the departure is at about 9 minutes.
Many thanks for your ideas, due to the difficult access to the d-sup pins it is pretty difficult to swap 2 probes in the plug.
Cheers Werner
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cskelt
Joined: 11 May 2021
Posts: 7
Location: Houston, TX
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| Posted: Tue Jun 08, 2021 4:16 am Post subject: Re: EGT issues hwo to troubleshoot best |
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Werner,
It's not clear if you're using Dynon sensors although other brands should be compatible if they're the same standard.
I has a similar problem with my EMS-D10 five years ago when I first started the engine. This was already a few years since installation. The EGTs read accurate ambient temperature but settled about 530 F during the runup. Unlike your case I saw low temperature on all cylinders. After discussing with Dynon I sent it back and it turned out to be an internal hardware problem that they fixed. No problems during the subsequent 300 hours of operation. It's not troubleshooting, but calling Dynon worked for me.
Regards,
Chris.
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Chris Skelt
Lancair 320 N1990L at KIWS |
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werner schneider
Joined: 24 May 2021
Posts: 58
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| Posted: Tue Jun 08, 2021 1:21 pm Post subject: EGT issues hwo to troubleshoot best |
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Thanks Chris.
No this are the sensors from my Rocky Mountain engine monitor, all the
rest is working fine just EGT4 is to low and the temperature is also all
the time fluctuating up and down where all the others are stable.
Cheers Werner
On 08.06.2021 14:16, cskelt wrote:
| Quote: |
Werner,
It's not clear if you're using Dynon sensors although other brands should be compatible if they're the same standard.
I has a similar problem with my EMS-D10 five years ago when I first started the engine. This was already a few years since installation. The EGTs read accurate ambient temperature but settled about 530 F during the runup. Unlike your case I saw low temperature on all cylinders. After discussing with Dynon I sent it back and it turned out to be an internal hardware problem that they fixed. No problems during the subsequent 300 hours of operation. It's not troubleshooting, but calling Dynon worked for me.
Regards,
Chris.
--------
Chris Skelt
Lancair 320 N1990L at KIWS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502288#502288
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cskelt
Joined: 11 May 2021
Posts: 7
Location: Houston, TX
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| Posted: Thu Jun 10, 2021 3:46 pm Post subject: Re: EGT issues hwo to troubleshoot best |
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Werner,
Here's an example of an EGT probe failure. The duration of the flight is about 28 minutes.
The tip was badly eroded and the problem fixed by replacing the offending article. Shortly afterwards two more failed so I replaced the remaining three and it's all been good since. They lasted about 280 hours.
Other than the failure, all the EGT and CHT behavior correlates with manifold pressure, mixture etc. and EGTs are more stable than yours. Note that after the failure EGT 2 went back in line with the other probes when the power setting was reduced for descent to destination.
Your EGT 4 has some of the characteristics of the others, although the response is attenuated. I would argue that none of your EGTs are as stable as they should be, and EGT 4 is uniquely pathological. Can you make a plot showing correspondence between EGT and CHT, and add some engine parameters like manifold pressure, fuel flow etc. as these should all tie together.
Regards,
Chris.
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Chris Skelt
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