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> The reason the number 180 came into play is that at that temperature the > water in the oil boils off. Actually, the water boils off at 212 (at sea level). 180 is the temperature at which it will heat up to 212 as it passes through the engine. This all came from Shell Oil, and maybe elsewhere too. Problem is the water, if not boiled off, turns to acid in the presence of other combustion byproducts. Frequent oil changes is one way to deal with the problem. I see no reason not to partially block off the cowl intakes. Many aircraft manufacturers actually provide winterization kits that do just that. Most recommend blocking only the inner portions, in front of the cylinders, and leaving the portion in front of the cylinder heads open. Duct tape seems to be the material of choice. Block off enough to get the desired temperature and no more. No more than half in any case. Also, check the accuracy of your oil temperature indicator. Before blocking the cowl inlets though, install the oil sump cover and intake tube covers, available from Wag-Aero, block off the hole under the prop that blows cold air on the oil tank, and block off any blast tube you may have on the oil filter or oil screen housing. John ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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