Factory Mooney OAT sensor with JPI?

[Jeev]

Hey all - I need to relocate my OAT sensor from my pilot side air vent to the factory location on the passenger side wing on my 78 J.  I have a JPI 730 and the existing sensor is the JPI 3in stick probe.  I would rather install the mooney factory button sensor but not sure it will work with the JPI.  I called JPI and they said maybe but can't say for sure.  Is anyone running the mooney factory sensor with a JPI engine monitor? Thanks for your help!  

[jclemens]

I can't comment on whether the Mooney probe will read correct if hooked to the JPI (my gut feeling is no).  What is the reason for moving it from the air vent?  

[Jeev]

I was thinking no as well but just hoping someone has done it and it works so i don't have to look at a 3in ugly stick hanging off my wing :).  I am moving it because it is inaccurate mounted there, reads warm.  It definitely picks up some heat from the cowl and flying IFR I really want an accurate OAT reading.

Edited March 18, 2016 by Jeev

[jclemens]

I alway put the probe inside the copilot side NACA scoop when I installed them.  I drilled the hole from the inside on the bottom of the duct, so the sensor would be positioned vertically inside the scoop.  Never had anyone complain about accuracy.  But, you could just as easily route the wires out to the factory location.  If your JPI sensor is 3" long, then it might not be the correct probe.  I recall the JPI one being about one inch long.

[N601RX]

Jpi uses a K type thermal couple.  If Mooney used a K type they should read very similar.  If it is a J type or resistive them it will not work.  You can adjust the jpi value upon or down a few deg in their software. 

 

[N201MKTurbo]

I'm fairly certain the factory sensor is a thermistor.

[Loogie]

The JPI 730 does not work w the factory accurately, either piggy backed or using the factory sensor direct to JPI.   The JPI sensor also reads inaccurately inside the scoop on the right side of cowl, plus it looks horrible.  JPI's words...

Mine is installed below the right wing in place of the factory sensor; you can't really tell it's there and it reads accurately.  Accurate temp sensor will give you a more accurate level of performance of your engine.  Good compromise.

 

[Jeev]

Thank you for the reply guys.  

2 hours ago, jclemens said:

I alway put the probe inside the copilot side NACA scoop when I installed them.  I drilled the hole from the inside on the bottom of the duct, so the sensor would be positioned vertically inside the scoop.  Never had anyone complain about accuracy.  But, you could just as easily route the wires out to the factory location.  If your JPI sensor is 3" long, then it might not be the correct probe.  I recall the JPI one being about one inch long.

My probe is mounted inside the pilots side NACA scoop vertically.  It is reading about 8-10c high in flight and within 1C on the ground with the engine off, may be some weird airflow making the pilots side warmer?  I am going to verify that that probe / wiring is operating correctly then relocate to the factory location if everything checks out.  Thank you. 

[Jeev]

Thank you everyone for the replies I will stick with the JPI probe.

[carusoam]

My POH doesn't mention if it is J,K, or thermistor...

That may require reviewing the MM of the long body.  Let me know if you are interested...

Best regards,

-a-

[jclemens]

Mooney uses a thermistor probe for their CDT probe, which has a similar range.  Wouldn't surprise me if the OAT probe was as well.

[ArtVandelay]

Mine is in same location, it's hard to tell the temp from the factory analog gauge, but it might be a little warmer, but not 10, maybe 3-4C. This is with cowl flaps closed in level flight to insure cleanest air flow.

11 hours ago, Jeev said:

My probe is mounted inside the pilots side NACA scoop vertically.  It is reading about 8-10c high in flight and within 1C on the ground with the engine off, may be some weird airflow making the pilots side warmer?  I am going to verify that that probe / wiring is operating correctly then relocate to the factory location if everything checks out.  Thank you.