I'm trying to understand the pattern of EGT changes in my IO360/airflow performance FM200/dual pmags engine when I reduce the throttle while maintaining altitude. Diagram attached, and I've manually added the values at "interesting" times.
![EGT HB-YMM 20201213.png EGT HB-YMM 20201213.png](https://vansairforce.net/data/attachments/3/3291-c5e2b0d5dc186754ef83ab84cb91f543.jpg)
When I'm flying along with full throttle all the EGTs are about the same, with only 27 degrees spread. When I reduce throttle and maintain altitude, two EGTs (3&4) start going up quickly, the other two a bit later. Continuing to reduce throttle, they all reverse, start dropping, but 3&4 stay together, and the other two change at different rates, eventually with #2 and #1 at very different EGTs. Adding throttle again gets them all together as before. Performance and smoothness are excellent. Without the engine monitor I would not suspect anything is wrong.
Does this indicate something that I can improve? I recently installed Ross's intakes as I suspected a leak, but that didn't seem to change anything. Injectors are clean. Plugs look very good. Thanks in advance for any hints or ideas.
![EGT HB-YMM 20201213.png EGT HB-YMM 20201213.png](https://vansairforce.net/data/attachments/3/3291-c5e2b0d5dc186754ef83ab84cb91f543.jpg)
When I'm flying along with full throttle all the EGTs are about the same, with only 27 degrees spread. When I reduce throttle and maintain altitude, two EGTs (3&4) start going up quickly, the other two a bit later. Continuing to reduce throttle, they all reverse, start dropping, but 3&4 stay together, and the other two change at different rates, eventually with #2 and #1 at very different EGTs. Adding throttle again gets them all together as before. Performance and smoothness are excellent. Without the engine monitor I would not suspect anything is wrong.
Does this indicate something that I can improve? I recently installed Ross's intakes as I suspected a leak, but that didn't seem to change anything. Injectors are clean. Plugs look very good. Thanks in advance for any hints or ideas.