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EMS reading oddities (Read 444 times)
Jul 16th, 2018 at 10:48am

RV6-KPTW   Offline
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Hey guys,

I am noticing an increasing number of instrumentation oddities. A couple of things:
- a while back, I saw that my CHTs were reading low - seem normal in climb, up to 350F but 270F in cruise, 250F in long descents even with power on. This has been a constant for about 2 or 3 years
- several months back amps went very negative and then rapidly changed but usually stayed negative - voltage stayed constant so I thought...hmmmm.... instrument error.
- yesterday, Oil temp was in the normal range (180-190) then gradually crept down to 150 with same power setting. Now I think, hmmm... more than 1 instrument?? Maybe the EMS unit?

What do you all think? A series of connections going bad, the coincidence of a series of sensors going bad, the EMS doing something interesting, or d). none of the above?

Am I seeing a trend here? Maybe. But of what?

Thanks for listening.

Dennis
 
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Reply #1 - Jul 16th, 2018 at 11:05am

RayInGA   Offline
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Richmond Hill, GA

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Make sure the EMS has a good ground to the engine.
 

Ray Eaker
RV-7A flying since 27 Jan 2017
Dual Skyview 1000T with all available Dynon VFR goodies
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Reply #2 - Jul 16th, 2018 at 5:12pm

jakej   Offline
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Australia

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Where is the ems mounted ?
Is it an RV with tip up canopy ?
 
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Reply #3 - Jul 17th, 2018 at 4:08am

RV6-KPTW   Offline
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I will check the grounding. This is a slider RV6 and the panel is about 4 or 5 years old. The EMS is mounted behind the panel. Not a lot of room and it might be pretty hot back there - we are seeing over 30C temps here in our summer. Makes some of the temps I noted even odder.

I am finishing up an RV14 so have not been spending as much time as Id like with the 6. Maybe she is acting out?
 
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Reply #4 - Jul 17th, 2018 at 4:42am

jakej   Offline
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Australia

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As Ray says, check your grounds for the EMS thoroughly.

Are you using a forest of tabs ? & , if yes, the push on terminals from the same source ?  Other cheap low quality terminals can cause grief.  I always make sure that I use the grounds out of the ems ( sometimes splitting them if necessary) & a ground almost directly to the battery.  It actually is connected directly to the ground strap bolt on the firewall - never had any issues doing it that way  Wink
 
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