Hello Dynon support,
My situation:
On my last few flights, the EGT reading on my #5 probe has been constantly fluctuating up and down by a few degrees Celsius every second or two, with occasional large swings (as much as 10-15 degrees) perhaps once every few minutes. Every other probe gives very stable readings. The #5 probe is also reading ever so slightly lower than the rest, but that could be normal variation in EGT.
Worryingly, every once in a while the #5 CHT also fluctuates sharply by a few degrees, then returns to a steady reading, within a second or two. On a half dozen occasions in the last 5hrs the CHT dropped almost instantly by 20 or 30 degrees Celsius then recovered to normal, all within one or two seconds. There was no corresponding change in EGT, other than the little swings I mentioned in the first paragraph. I struggle to believe the cylinder could really be changing temperature so quickly...
My engine is a new IO-540, running LOP most of the time, full Dynon EFIS / EMS and all Dynon supplied harnesses and probes. We have 285hrs on the whole set-up.
We experienced EGT measurement issues last summer, at exactly this time of year (the hottest month of the southern hemisphere summer) - exact same cylinder. Ambient temps have been very hot lately, and the engine has been running hotter than usual.
Throughout all this, the engine has never missed a beat, [noticeably] run rough, the noise and power output remain constant, nothing.
My questions are:
*Does any of this behaviour sound like a failing probe / bad crimp connection / something else you've seen before?
*Does the software which reports EGT and/or CHT include any time-delay or fluctuation-dampening algorithms, or are the measurements reported as soon as the probes measure a change in temperature?
*The fact both probes giving strange readings are on the same cylinder is concerning. Does this sound symptomatic of a well-known engine problem?
*Should EGT/CHT probes be thought of as consumable items, which will need to be replaced every few hundred hours?
Thanks very much for your help.
My situation:
On my last few flights, the EGT reading on my #5 probe has been constantly fluctuating up and down by a few degrees Celsius every second or two, with occasional large swings (as much as 10-15 degrees) perhaps once every few minutes. Every other probe gives very stable readings. The #5 probe is also reading ever so slightly lower than the rest, but that could be normal variation in EGT.
Worryingly, every once in a while the #5 CHT also fluctuates sharply by a few degrees, then returns to a steady reading, within a second or two. On a half dozen occasions in the last 5hrs the CHT dropped almost instantly by 20 or 30 degrees Celsius then recovered to normal, all within one or two seconds. There was no corresponding change in EGT, other than the little swings I mentioned in the first paragraph. I struggle to believe the cylinder could really be changing temperature so quickly...
My engine is a new IO-540, running LOP most of the time, full Dynon EFIS / EMS and all Dynon supplied harnesses and probes. We have 285hrs on the whole set-up.
We experienced EGT measurement issues last summer, at exactly this time of year (the hottest month of the southern hemisphere summer) - exact same cylinder. Ambient temps have been very hot lately, and the engine has been running hotter than usual.
Throughout all this, the engine has never missed a beat, [noticeably] run rough, the noise and power output remain constant, nothing.
My questions are:
*Does any of this behaviour sound like a failing probe / bad crimp connection / something else you've seen before?
*Does the software which reports EGT and/or CHT include any time-delay or fluctuation-dampening algorithms, or are the measurements reported as soon as the probes measure a change in temperature?
*The fact both probes giving strange readings are on the same cylinder is concerning. Does this sound symptomatic of a well-known engine problem?
*Should EGT/CHT probes be thought of as consumable items, which will need to be replaced every few hundred hours?
Thanks very much for your help.
)