mike.smith wrote:WesRagle wrote:
I've never cut into one of these but I assume (I'll do a lot of that in this post) that there is a thermistor connected between the terminal on top of the sensor and the sensor body.
Notice that there is no thermal barrier between the "nut and threads" portion of the sensor and the portion of the sensor that is immersed in oil.
While it's hard to find cut-aways of such a simple device as a temperature sensor, from the things I've found the outside only "looks" like it's a solid mass, but in fact there are separations between materials. These links may not be exactly what we have in our engines, but they are at least similar. And it looks like the engineers were smart enough to have thought to separate the actual probe element from the rest of the body:
https://www.youtube.com/watch?v=TC7iTRWZ0bM
https://www.slideshare.net/HardikRathod ... re-sensors
http://premierautotrade.com.au/news/exh ... rs-EGT.php (see EGT cut-away near bottom of page)
mike.smith wrote:We'll just agree to disagree.
WesRagle wrote:
Also, I think Mike Farley's post goes a long way toward proving the point that the sensor is sensing more than just the oil temperature.
MichaelFarley56 wrote:WesRagle wrote:
Also, I think Mike Farley's post goes a long way toward proving the point that the sensor is sensing more than just the oil temperature.
I have no real axe to grind in this discussion; even when my engine was indicating higher oil temps I never hit 240 degrees (regarded by many as being a standard for maximum oil temp) and my oil pressure was always solidly in the green.
Just to clear up any confusion on my post, I do want to make it clear that I did not install any sort of blast tube or direct air source onto my sensor; rather, all I did was notch a 1.5" slot in my pilot side baffling with the hope that some air flow over the front of the entire engine would help reduce the errors I was seeing in my indicated temperature. For whatever reason, it worked just fine on my setup and I'm happy with the results. As far as I'm concerned, I was reading inaccurately high readings which could be the result of radiant heat coming off the nearby exhaust pipe, and allowing some air movement solved the issue. I didn't have this issue with the vertical split cowling and I'm glad it's resolved with my new horizontal split cowling as well.
Just my two cents of course!!
all I did was notch a 1.5" slot in my pilot side baffling with the hope that some air flow over the front of the entire engine would help reduce the errors I was seeing in my indicated temperature.
Obviously, getting a little bit of air flowing over the sensor made a big difference on my engine readings!
If you're struggling with high indicated oil temps and you don't have the lower cowling opening, you can consider either adding the cowling opening or modifying your baffling (or adding a blast tube) by the temp sensor and see if that helps.
I was still getting good oil pressure (around 48-50 psi) and suspected I was having an issue with the oil temp sensor getting heat soaked by the exhaust and hot, stagnant air in the lower cowling.
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