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JPI EDM 900 Install in an M20J

0TreeLemur

By 0TreeLemur
in Engine Monitor Discussion

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ArtVandelay
ArtVandelay

I don’t think that’s true, you’re probably referring to this language: “The functions of Volts, Amps, and Horse Power were tested to DO-160D and DO-178B, but not TSO’d since no TSO exist for these fun

mhrivnak
mhrivnak

In my 1990 J, the circuit breaker panel and related enclosure was riveted in place, making that shunt a giant pain to access and replace. It was a slow exercise of blind contortions and patience. It m

0TreeLemur
0TreeLemur

It took my wife and I about 50 hours to install it.   Our C had the original windshield, so we had access to the backside of the panel through the top, which was awesome.  In our C, the ammeter shunt

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JayMatt Community Regular

JayMatt

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Reading through all this has thoroughly convinced me that I don't want to install one of these myself. What's it cost to buy and have the 900 installed typically? 

jetdriven Grand Master

jetdriven

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JPI doesn't really have a yellow arc for the oil pressure on the EDM 830, but I think the 900 has a yellow band so between 25 and 60 is yellow and then below 25 is red on the 900.

  • 3 weeks later...
0TreeLemur Grand Master

0TreeLemur

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Got the plane back from the shop with JPI EDM900 installed.   Went over last Saturday for a test flight and to help calibrate fuel senders.  Before startup everything seemed to be working.   All EGT and CHT's were about 70F.  On first test flight the EGT probes on cyl 2 & 4 both read about 600 degrees F less than cyls 1 & 3!   Weirdness.  When I tested the lean find function, they responded normally when displayed in normalized view.    Landed and they put two of the old EGT probes on those two cylinders and the problem disappeared!  What are the odds of 2/4 new EGT probes being "bad"?    I guess >0.

They installed the new JPI shunt on the firewall in the engine compartment and left the original shunt in place.   In fact they never saw the original shunt.  It's in there somewhere in the vicinity of the avionics cooling fan, way in the back.  Removing it would require a lot of disassembly.

Everything works!

 

N202Y_panel_after.jpg

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JayMatt Community Regular

JayMatt

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9 hours ago, 0TreeLemur said:

N202Y_panel_after.jpg

Very nice. I want one, but I want a lot of things and I'm trying to discipline my spending habits on this airplane.

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0TreeLemur Grand Master

0TreeLemur

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On 4/2/2023 at 2:08 PM, EricJ said:

.. my EDM was installed by my ridiculously-anal avionics shop (the reason I got my A&P).  

Really?  They must be horrible!

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0TreeLemur Grand Master

0TreeLemur

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6 hours ago, JayMatt said:

Very nice. I want one, but I want a lot of things and I'm trying to discipline my spending habits on this airplane.

Good luck.  Discipline is hard when you have Mooney Fever!

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