ctspain

How did you notice carb ice? Engine dropping revs and running unbalanced? Last year I had a problem, flying 7ºC raining a little , cloudy, humidity nearly 100%, I didnt use carb heat and after 1h, engine started to do really weird things, about 2 seconds misfire, later fine again, 20minutes later, same happened, It repeated 4 or 5 times, I landed in the nearest field and talk to my mecanics, they asked me to check I had water in the bowls and there it was, a drop of water there. Some people thinks ice in carb when melted went to bowl and others think I had water in the fuel. (I have a gascolator and check it before every flight, never found water.

Thank you Roger. You're always really helpfull.

Thank you Roger. I balanced carbs few hours ago, about 10h. But it was summer and quite hot, not sure if it affects. I am affraid mix is should be a little bit richer. That could explain my usual high egts. My Dynon shows an alarm over 800°C (it is not going higher than that) sometimes. If I apply more throttle, more fuel, it goes down a little to green arc.

I know that this thread has 5 year but I hope in all that time someone found any reason for it. Today I flew about 1.5h quite nice weather, 14°C. I changed few months ago my oem filter to a K&N. Exactly same facts that original question. I wanted to test any rpm drop when heating on so at 5000 rpm, 210km/h, i set the autopilot, hold altitude and pulled carb heat, my surprise was exactly the same happened, heat off, 4990 rpm, heat on 5010 rpm and the most weird thing, smoother engine. I did it 4 times, always same results. Any idea about happens? KN filter has original oil, no extra oil added.