Original Posted By: del magsam
Subject: Pietenpol-List: Carb ice & mogas linkhttp://www.magma.ca/~ggrabe/carbice.htmlI found the below text in the above link. Some folks only believe that 100LL is less susceptible to vapor lock, which it is, but it also is less prone to helping chill-down your carb. After WW2, my old man dusted cotton in the summerin a Champ, powered with a Continental 65. He mainly dusted cotton in the Rio Grande area here in Texas and in irrigated fields. The humidity levels are obviously higher over a wet cotton field on a warm summer day than what one might expect in a West Texas desert. These old pilots soon discovered that carbice was a BIG problem when using MOGAS and was less of a problem when using avgas. (Sidebar... when Uncle Sam started selling off Stearman airplanes a fewyears after the war, these old cotton dusters switched to the bigger airplanesand abandoned airplanes powered by a 65 Continental.)Conditions conducive to carb-ice formation can occur without any prior warning and in situations that may seem inappropriate, creating a very hazardouscondition that could leave the aircraft and pilot vulnerable to engine failure.This results in an extremely unreliable hit-and-miss diagnosis of the problem.This situation is further amplified when using MOGAS which is more susceptibleto the formation of carb-ice due to its higher volatility (ice may form at OATs up to 68F or 20C higher than with AVGAS)SterlingKnot-2-Shabby Airport & Texas Longhorn Cattle Ranch5TA6, San Antonio Sectional ________________________________________________________________________________Date: Tue, 30 Nov 2004 05:47:21 -0800 (PST)