Originally Posted by
jam0552@msn.com
I have an O-290D powered J5A which I used to fly in Seattle, Washington, where there is plenty of moisture and carb ice. On runup after mag drop and carb heat check, while finishing the rest of the items on my predeparture checklist and taxiiing into position for takeoff, I left my carb heat on full. Then just before takeoff roll started, I would shut off carb heat. It seemed to help - I never had carb ice on takeoff. I had it once at cruise at 2600 RPM. I also would get it at idle just after start while taxiing to the runup pad. Lycomings should be less susceptible to carb ice due to carb mount directly to oil sump. But the oil and sump need to be hot in order for that to work. Is your engine running too cold? My oil temp used to barely get above 160 degrees on cold winter days.
-Joel Marketello