peevee Posted July 30, 2016 Report Posted July 30, 2016 We use the ei ring style cht probes for our ei analyzer. We are replacing these probes like it's our freaking job, one about every 20 hours it seems. Is there either a better alternative to these things or possibly something the mechanic is doing that's killing them? They're really not cheap either! Quote
carusoam Posted July 30, 2016 Report Posted July 30, 2016 There are two styles of ring probe. The one that goes under the spark plug, and the one that goes piggy backs the CHT probe. The one that piggies with the CHT probe is a better read and it doesn't get removed when looking at spark plugs annually. Which one do you have? The spark plug one? Best regards, -a- Quote
peevee Posted July 30, 2016 Author Report Posted July 30, 2016 (edited) Just now, carusoam said: There are two styles of ring probe. The one that goes under the spark plug, and the one that goes piggy backs the CHT probe. The one that piggies with the CHT probe is a better read and it doesn't get removed when looking at spark plugs annually. Which one do you have? The spark plug one? Best regards, -a- The spark plug ring style. My ASSumption is we can't use the cannon plug style because our reiff engine heater is occupying the slots. They break when the plugs are removed sometimes as you eluded to, but mostly ours just quit for no real reason without anyone touching the plugs. As they're something like 200 bucks to replace I'm hoping someone makes a compatible unit that's a little more robust. It's a tsio-360lb fwiw. Edited July 30, 2016 by peevee Quote
carusoam Posted July 30, 2016 Report Posted July 30, 2016 Then... It Might take a conscientious mechanic to help fit one under the reiff hardware the same way. It has a high likelihood of working because it is the standard threaded hole..? No real threat to be over heated by the reiff device. check with reiff, they may have a solution for that, since CHT is pretty much their business! Best regards, -a- Quote
peevee Posted July 30, 2016 Author Report Posted July 30, 2016 Just now, carusoam said: Then... It Might take a conscientious mechanic to help fit one under the reiff hardware the same way. It has a high likelihood of working because it is the standard threaded hole..? No real threat to be over heated by the reiff device. Best regards, -a- Thanks, didn't know it was an option, I'll ask about it! Quote
carusoam Posted July 30, 2016 Report Posted July 30, 2016 I finished my thread a bit later... You may want to check with reiff as I outlined above... Best regards, -a- Quote
M20F Posted July 30, 2016 Report Posted July 30, 2016 I have a Reif Heater and EI Bayonet plugs so shouldn't be anything on it blocking you. Quote
Yetti Posted July 30, 2016 Report Posted July 30, 2016 18 hours ago, peevee said: They're really not cheap either! Maybe a new supplier? https://www.amazon.com/Thermocouple-Temperature-Sensors-Washer-Cylinder/dp/B015LXMJPY/ref=sr_1_3?ie=UTF8&qid=1469914109&sr=8-3&keywords=cht+thermocouple Quote
Yetti Posted July 30, 2016 Report Posted July 30, 2016 https://www.amazon.com/Thermocouple-Temperature-Sensors-Cylinder-Measurement/dp/B010BTSQSC/ref=sr_1_5?ie=UTF8&qid=1469914306&sr=8-5&keywords=cht+thermocouple Quote
Yetti Posted July 30, 2016 Report Posted July 30, 2016 Oh lookey non aircraft pricing on EGT CHT thermocouple and digital monitors http://thesensorconnection.com/category/cht-sensors/all-cht-sensors Quote
Aerodon Posted July 30, 2016 Report Posted July 30, 2016 20 hours ago, peevee said: We use the ei ring style cht probes for our ei analyzer. We are replacing these probes like it's our freaking job, one about every 20 hours it seems. Is there either a better alternative to these things or possibly something the mechanic is doing that's killing them? They're really not cheap either! Peewee, I've used JPI gasket probes for years, they have a little diagonal support for the wire. The last set lasted 800 hours, the support breaks first, then the wires break off. I'll go compare them to the EI probe. Where are yours failing? I have some new surplus GEM CHT probes for you, send me an email to supercub180@gmail.com Don Quote
peevee Posted July 31, 2016 Author Report Posted July 31, 2016 (edited) 21 hours ago, carusoam said: I finished my thread a bit later... You may want to check with reiff as I outlined above... Best regards, -a- I'm really not sure. One broke at annual, I assume the ring broke when they removed the plug. This same one (#3 again) is intermittent 3 months later. The previous ones have just gone open loop but I never thought to ask the mechanic if they broke physically or what. I suspect this one might be a bad solder, something about #3 is a bear for him to wire. Maybe it's the fact that he tests them with a propane torch... Since I posted this the flaps and fuel flow transducer crapped out so I got bigger fish to fry temporarily haha Edited July 31, 2016 by peevee Quote
Piloto Posted July 31, 2016 Report Posted July 31, 2016 23 hours ago, carusoam said: There are two styles of ring probe. The one that goes under the spark plug, and the one that goes piggy backs the CHT probe. The one that piggies with the CHT probe is a better read and it doesn't get removed when looking at spark plugs annually. Which one do you have? The spark plug one? Best regards, -a- I have the one with the ring for the bayonet CHT probe. So far after five years never had a problem and it correlates right on with the factory probe. José 1 Quote
bradp Posted July 31, 2016 Report Posted July 31, 2016 The spark plug washers read 20-40 degrees higher than the bayonet or piggyback probes, fwiw. Quote
kortopates Posted July 31, 2016 Report Posted July 31, 2016 7 hours ago, bradp said: The spark plug washers read 20-40 degrees higher than the bayonet or piggyback probes, fwiw. We see them both ways, higher and lower. I would never have them on my aircraft since with these you never know what the real CHT temperatures are. This problem of co-locating a heater element in the cylinder bayonet hole with a CHT probe has been solved by Tanis, which is what I use. But I don't know if they are compatible with your Reif but they just need 120v for the heater portion and Tanis makes them for all kinds of engine monitors and power sources. Here is an example of one of there threaded heater elemts with dual probe in K type probe http://www.tanisaircraft.com/tt02633-uk-115-50.html 1 Quote
peevee Posted July 31, 2016 Author Report Posted July 31, 2016 7 minutes ago, kortopates said: We see them both ways, higher and lower. I would never have them on my aircraft since with these you never know what the real CHT temperatures are. This problem of co-locating a heater element in the cylinder bayonet hole with a CHT probe has been solved by Tanis, which is what I use. But I don't know if they are compatible with your Reif but they just need 120v for the heater portion and Tanis makes them for all kinds of engine monitors and power sources. Here is an example of one of there threaded heater elemts with dual probe in K type probe http://www.tanisaircraft.com/tt02633-uk-115-50.html Those are slick. I'm betting they would work. I'll check into it. Quote
Yetti Posted July 31, 2016 Report Posted July 31, 2016 Tempco which Grainger distributes some product for has some of the heater and thermocouple http://www.tempco.com/Catalog/Section 5-pdf/Tempco-Pak.pdf Grainger has the silicone heater pad https://www.grainger.com/product/GRAINGER-APPROVED-Silicon-Rubber-Heater-WP5076666/_/N-/Ntt-silicon+heater?NLSCM=46&optOut=0&sst=subset&s_pp=false&picUrl=//static.grainger.com/rp/s/is/image/Grainger/3CDD1_AS01?$smthumb$ Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.