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  #1  
Old 06-07-2017, 06:52 AM
High_Flyer's Avatar
High_Flyer High_Flyer is offline
 
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Location: Saint-Jorioz, France.
Posts: 199
Default Dynon EMS: EGT and CHT "limlited" values

Hello everyone.

I made my 1st flight last sunday and one of the problems I had was that I noticed that my EGT readings were all very low, around 470-475°F.

My setup is a full Dynon Skyview, including the Dynon EMS 220, aerosport IO-375-M1S engine.

I did some troubleshooting and dicovered that all 4 EGT do not go over 475°F and all 4 CHT do not go over 375°F, as if the probes were "maxed out" at those values. No further flight before this is resolved because I won't see if my temps are over the above values...

I started a thread on the Dynon forum, here is the link:
http://dynonavionics.com/cgi-bin/yab...num=1496658840
Not too many replies so far.
I have also talked to Dynon support by phone, and they don't have an answer either...

Here is what I did so far:
- Checked proper probes model installed: OK
- Checked proper EMS installed (EMS 220): OK
- Checked continuity of the wires to the correct EMS pins : OK
- Checked "polarity" of the wires: OK
- Checked Gounds: OK
- Added a ground wire direct from EMS to engine block
- Verified Debug page parameters as told by Dynon support:
Volt Ref around 5V: OK
TC Offest around 0.4V : OK
Clod J around room temp : OK

So far I couldn't find the cause.
I've ordered a new EMS today, should arrive tomorrow. If it is not the EMS that's faulty then I don't know what else to do...?

Maybe one of the electronics Guru here will have a solution??
Has anyone seen this problem before??

Thank you.

Alain.
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RV7 (F-PRVZ), Tip Up, Aerosport IO-375, Dynon Skyview, VP-X, Day VFR.

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Last edited by High_Flyer : 06-07-2017 at 09:39 AM. Reason: Correction °C to °F
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  #2  
Old 06-07-2017, 07:51 AM
smash smash is offline
 
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Location: Fair Oaks,CA
Posts: 58
Default

Quote:
all 4 EGT do not go over 475?C and all 4 CHT do not go over 375?F
Are you measuring in Fahrenheit or Centigrade (F or C)?
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  #3  
Old 06-07-2017, 08:58 AM
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High_Flyer High_Flyer is offline
 
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Location: Saint-Jorioz, France.
Posts: 199
Default

Quote:
Originally Posted by smash View Post
Are you measuring in Fahrenheit or Centigrade (F or C)?
Fahrenheit...

Sorry about the mistake in my 1st post.
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Last edited by High_Flyer : 06-07-2017 at 09:37 AM.
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  #4  
Old 06-07-2017, 09:56 AM
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dynonsupport dynonsupport is offline
 
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As an FYI, Dynon is handling this over on our forum:

http://dynonavionics.com/cgi-bin/yab...num=1496658840
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  #5  
Old 06-07-2017, 09:57 AM
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Toobuilder Toobuilder is offline
 
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Location: Mojave
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What were your EGT's during your engine testing? Even at idle they should have been well north of 475. Is this a new issue?
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  #6  
Old 06-07-2017, 03:16 PM
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High_Flyer High_Flyer is offline
 
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Quote:
Originally Posted by Toobuilder View Post
What were your EGT's during your engine testing? Even at idle they should have been well north of 475. Is this a new issue?
I didn't really pay attention during 1st engine start t be honest. I thought that on the ground at low power it was normal for the EGT to be low...
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  #7  
Old 06-07-2017, 03:35 PM
CGameProgrammer CGameProgrammer is offline
 
Join Date: Jan 2014
Location: San Diego, CA
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Cylinder head temperature starts cold and slowly warms up, but exhaust gas temperature should be hot instantly.
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