High O-360 CHT's
By reaching out on this Piper forum, I am hoping someone will have some information on an issue I am having with my 1973 Piper Challenger O-360 engine. I have about 900 hours on a remanufactured engine. I also recently installed a JPI EDM 830 engine monitor which is great by the way, but I recently have been experiencing some high CHT's on cylinders #1 & #4. I would like to keep my CHT's under 400 but actually these cylinders are not. They run 30-50 degree hotter than the rest & even hit 450 (Red Alert) at different times. Below are my scenarios: Cylinder #1: This cylinder will run hotter in cruise for some reason after I have leaned ROP, (around 9.5 GPH), using the EDM 830. It runs hotter continuously 30-50 degrees until I enrichen the mixture to around 10.5 - 11.0 GPH. Cylinder #4: #4 runs hotter at take-off 30-50 degrees even up to the Red Alert of 450. I think it got up to 454 degrees before I was able to lower the nose to increase airspeed during the climb to cool it off below the Alert Speed of 450. Here is a link to Savvy Aviation showing 62 of my flights & most recently the one I want to draw attention to is 10/15/22, Perryville, MO (K02), to Salem, MO (K33), that shows this phenomenon of high CHT's.
Here is more detail of the issue I was experiencing on this particular flight. During my recent trip to our Missouri farm, here is a fuel stop leg I took from Perryville, MO to Salem, MO and as I was taking off with full power & full mixture rich, I then got an EDM 830 alert at about 2000 feet that my cylinder #4 was blinking RED & was over 450 degrees, (454 to be exact), so I immediately lowered the nose & turned back towards the airport thinking I could be having a serious problem. However, once I lowered the nose & pickup'd airspeed, the CHT on #4 started to lower back into a more normal range so I decided to continue my trip which ended up as a non-event. Then on the other 2 legs back to Ohio, I noticed the same thing happening, but I lowered the nose, increased airspeed, just before it got to the Red-Line of 450 degrees. So, I am wondering if I have an engine problem especially that now I have 2 cylinders running extra hot! Any idea what I might do, or should I be worried? Thanks in advance for any input. Don