UdoR wrote:
Now that’s not necessary, to my opinion, but an interesting addon. For example, you can easily check CHT temperatures on LOP side vs. ROP side and thus elaborate whether your injectors are well balanced or not. Something I am on right now. You don’t need RPM data for this.Now what additional information do you get if you correlate EGT/CHT with RPM?
That’s all nice but Mooney_Driver has a carbureted plane and rents it to other people. Are RPM limits observed? How rapid are power changes done? Chop and drop etc…
I had mine upgraded in size (first two threads here) and like the display.
The UI is crap (the 1975 two-button-do-everything video casette recorder thing) but there is no need to interact with it. After engine start, just press the LH button a few times to stop it scanning and fix it on a particular cylinder.
Data download is via an RS232 cable and a USB-RS232 adaptor (which we make at work) and works “okay”, with my major gripe being the very limited data storage of 10-20hrs. Plus the crappy JPI software, but hey most PC software has a crap UI because it is written using the latest fashionable paradigm. Google Maps, anyone? I download the data using a very old version of their software. Overall not a big enough fish to fry to change it.
Peter wrote:
Mine came with the EDM700 so never had the analog gauges.
How happy are you with the 700 and how do you read out the data from it?
I agree; it is usually obvious which phase of the flight the data is from, and during a flight the RPM is constant, or close to.
RPM is nice but I would not break the bank to get it. Things like this are much more important especially if you are using the engine monitor to collect data for GAMI injector ordering.
Snoopy wrote:
I don’t see any point in logging engine data such as EGT or CHT if there is no corresponding RPM data?!
Now that’s not necessary, to my opinion, but an interesting addon. For example, you can easily check CHT temperatures on LOP side vs. ROP side and thus elaborate whether your injectors are well balanced or not. Something I am on right now. You don’t need RPM data for this.
Now what additional information do you get if you correlate EGT/CHT with RPM?
I think the most expensive part of the bigger engine monitor installations is the cost of hacksaw blades needed to hack the holes in the panel 
Nearly all of the installations I have seen are horrible – like somebody threw the thing in. Panel design is an art, to do well.
Which aircraft has a primary instrument for EGT/CHT? I know some types that have a primary TIT, but have not seen a primary EGT/CHT yet…
The TB20 has a primary EGT+CHT analog gauge. The original EDM700 is factory-TC-certified to replace that, but not on the TB21 where the original gauges have to be left in (to be strictly legal). Mine came with the EDM700 so never had the analog gauges.
There is a separate requirement in Part 23 or some such for a CHT instrument, but not for an EGT instrument.
Snoopy wrote:
I don’t see any point in logging engine data such as EGT or CHT if there is no corresponding RPM data?!
ok, now I get it. And yes, of course you have a point.
Snoopy wrote:
The cost of EASA STC validation is around 300 Euro. Why “multitude of purchase price”?
Oh ok, that is different then. I thought you have to run through your own STC certification. Which would be prohibitive.
Snoopy wrote:
I also heard from an avionics tech that it’s possible to fit TSO’d engine monitors without any STC.
Yea but that unfortunately excludes Insight and the others are too expensive.
Well, better not think about such stuff in the first place.
Snoopy wrote:
Apart from this future improvement, is it possible – currently – to install TSO engine monitors (only as additional info and not to replace primary indications) without STC?
When it comes to JPI they already have EASA STCs available. So it should not be any issue installing a JPI monitor without the updated CS STAN
Airborne_Again wrote:
Multifunction engine displays will be covered by a coming addition to CS-STAN which is expected in the first quarter of 2022.
Apart from this future improvement, is it possible – currently – to install TSO engine monitors (only as additional info and not to replace primary indications) without STC?
Snoopy wrote:
I also heard from an avionics tech that it’s possible to fit TSO’d engine monitors without any STC. Not enough time to dig through EASA website for this so I never verified it.
Multifunction engine displays will be covered by a coming addition to CS-STAN which is expected in the first quarter of 2022.
