Eddie Cesnalis Posted January 25 Report Share Posted January 25 I'm looking on buth Aircraft Spruce and Dynon but don't see the sending unit Quote Link to comment Share on other sites More sharing options...
Anticept Posted January 25 Report Share Posted January 25 Part # 965 531 https://www.leadingedgeairfoils.com/cht-oil-temp-sender-for-rotax-reg-912-914.html You could try to find an alternative, they're just VDO thermistor type and you can look in the rotax manuals for their response curve. It's an M10 x 1.5 VAF guy claims these could replace the rotax ones: 323-801-010-001D, stamped 801/10/1 by VDO, 300F or 150C max https://vansairforce.net/threads/rotax-oil-water-temperature-sensors.156107/ That model seems to be discontinued and the replacement is VDO A2C1755400001 They're not the round terminals like we have though. Apparently the round tops are called "Bosch" or "56 Series Packard" terminals. https://www.vdo-instruments.com/instructions/A2C59519516 Temperature and Press Senders.pdf Quote Link to comment Share on other sites More sharing options...
Eddie Cesnalis Posted January 25 Author Report Share Posted January 25 Thank you CoreyLee Quote Link to comment Share on other sites More sharing options...
Anticept Posted January 25 Report Share Posted January 25 Still researching, and editing in more info. EDIT: 150c, M10 x 1.5 round top connector seems to be a very strange mix and difficult to find. Mainly its the x 1.5 part. VDO's website lists various sensors but none fitting ALL of these criteria. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted January 25 Report Share Posted January 25 Maybe give this a look. https://www.aircraftspruce.com/catalog/inpages/flightline13-16029.php Quote Link to comment Share on other sites More sharing options...
FredG Posted January 25 Report Share Posted January 25 The sensor is sold by Rotax (they are installed on new engines). See LEAF: https://www.leadingedgeairfoils.com/cht-oil-temp-sender-for-rotax-reg-912-914.html Unfortunately, it is crazy expensive. EDIT: It is entirely possible (I do not know) if the sensor that Tom directed you to is the same as the Rotax sensor sold by LEAF. The sensor Tom directed you to is about $150 cheaper (not a typo) than the Rotax part sold by LEAF. Quote Link to comment Share on other sites More sharing options...
Anticept Posted January 26 Report Share Posted January 26 The one tom linked will work. It's the correct range and thread size. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted January 26 Report Share Posted January 26 What is the temperature range of the Rotax supplied part? Quote Link to comment Share on other sites More sharing options...
FredG Posted January 26 Report Share Posted January 26 Tom, don't know. The LEAF site simply notes: "CHT/Oil Temp. Sender for ROTAX® 912/914 for Part No. G4152 and G4153" Quote Link to comment Share on other sites More sharing options...
Anticept Posted January 26 Report Share Posted January 26 50c-150c. When I was checking the other VDO parts I took their resistance response graphs and checked them against the rotax supplied ones and they matched. Thermistors are super simple devices, they just go down in resistance as they warm up, and there's not much else to them. There's still a tiny possibility they won't work, but like thermocouples... there's not a whole lot to actually change. They technically can respond outside of that range, but the bulk of operation is within those limited ranges and are the most sensitive there. When I checked against thermistors with other min/max values, their curves didn't match the graph rotax supplied. Quote Link to comment Share on other sites More sharing options...
Eddie Cesnalis Posted January 26 Author Report Share Posted January 26 Thanks everyone for all the help on this Quote Link to comment Share on other sites More sharing options...
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