rotorman Posted January 23, 2022 Report Posted January 23, 2022 I recently changed out my factory EGT gauge with a used one. The old one was jittery. This gauge shows my peek temp when leaning considerably higher than the old. What peeks do others see at 7 to 10k feet? My gauge is in centigrade.
N201MKTurbo Posted January 23, 2022 Report Posted January 23, 2022 (edited) You can check the accuracy using the method in the Alcor data sheet. Take out the probe and heat it up with a torch. When it just begins to turn red it should read 1600. Edited January 23, 2022 by N201MKTurbo 1
Brandt Posted January 23, 2022 Report Posted January 23, 2022 Just FYI https://resources.savvyaviation.com/wp-content/uploads/articles_eaa/EAA_2010-10_egt-myths-debunked.pdf
rotorman Posted January 23, 2022 Author Report Posted January 23, 2022 33 minutes ago, Brandt said: Just FYI https://resources.savvyaviation.com/wp-content/uploads/articles_eaa/EAA_2010-10_egt-myths-debunked.pdf Thanks for the article. I was aware of pretty much all the articles states and I am not concerned with the absolute number. I have the early GAMI on my panel. I just found it interesting how far apart the original analog EGT indicator is from the one I just installed. The one that I took out was jittery. The new one is stable but indicates much higher at peak. So I was wondering if the low indication from the old gauge was another symptom of the gauge going bad. 1
carusoam Posted January 24, 2022 Report Posted January 24, 2022 Many panels have the Alcor EGT gauge… where the microvolts generated at the TC actually drives the needle…. Laws of physics drive how many microvolts are generated based on the actual temp they are seeing…. There are two different thermocouple sensor types that are common in airplanes… K is most common in Mooneys…. If you got the wrong sensor type…. You would see a very different result…. Alcors don’t usually have any numbers on their face…. It gets calibrated by the user who aims the needle towards the * inflight…. Unless something changed, sensor type, or location… there isn’t much drift occurring in EGT indicators…. Of course… dirt can get in the system… and somebody could have calibrated the system with dirt in it…. Replacing parts cleaned the dirt…. And things are working correctly again… Not all Mooneys got calibrated EGT systems… Turbos did, and Long bodies did…. The sensors are at precise locations from the exhaust valve… not just holes drilled in the exhaust tube, where a thicker seal can result in a change of EGT… based on distance from the valve… PP thoughts about EGT changes in calibrated systems only, not an instrumentation guru… Best regards, -a-
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