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.
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.
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.