Spark Plug Gasket CHT temp HIGH!

[Tommy]

Hi guys!

Went out and did a brief test on my newly installed EDM700.

Everything is working perfectly except CHT 3 reading is almost 60 to 80F higher than factoy in almost all phases of flight (tops at 460F). The spark plug gasket probe was installed on the bottom plug.

Is this normal? Should I use factory reading for that particular cylinder instead ? Would change to top spark plug makes any difference? Is there any way to change preset warning CHT on one single cylinder so the warning doesn't flash?

Thanks

[KSMooniac]

Normal for the spark plug probe...you should swap it for a piggy-back probe that will feed the factory CHT and the JPI and then the issue goes away.

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[Marauder]

Hi guys!

Went out and did a brief test on my newly installed EDM700.

Everything is working perfectly except CHT 3 reading is almost 60 to 80F higher than factoy in almost all phases of flight (tops at 460F). The spark plug gasket probe was installed on the bottom plug.

Is this normal? Should I use factory reading for that particular cylinder instead ? Would change to top spark plug makes any difference? Is there any way to change preset warning CHT on one single cylinder so the warning doesn't flash?

Thanks

It will run hotter. On my old GEM it was probably 40 to 50 degrees hotter until I went with the bayonet probe.

I think the warning is for all cylinders only.

[jetdriven]

I put a 3/8" CHT thermocouple under the factory CHT sender. It works and costs 12$.

It reads 40F low. But I can deal with that.

[DonMuncy]

I don't see a lot of difference between using a spark plug sensor you know reads x degrees high, and a piggy-back under a factory sensor that reads y degrees low. You just have to watch to see if the temperature goes above what you know is "normal" for that cylinder.

Ideally you would swap sensors for one cylinder to another to determine the baseline to call normal.

[Tommy]

The readings are consistently high. The only way I guess I can absolutely sure is to put a normal CHT probe in place of the factory one and run it to see...

It's just such a pain and not to mention not allowed to fly in this configuration as EDM 700 is not a primary.

Guess I will just go with the factory on that cylinder - not much choice as other cylinders will be running way too cool if I keep it under 380 - and work out the difference...

[BigTex]

Tommy mine reads 40 degrees cooler.  It's not a big deal... you learn what is normal and that's the profile you use.  cross check it with the planes primary cluster if you choose.

[garytex]

I Had same issue when I put so gasket sender on bottom plug. Per Jpi put SP gasket on 3 on upper plug. It will then approximate the bayonet. Work fine lasta longtime.