I too can't fly the 109 anywhere above 3000m without killing my engine. Even with less than 1.1 ata and 2000rpm and wide open radiators + oil cooler, there's no chance to prevent the engine from getting damaged. Below I've no problems expect some relatively rare "stutters" from the engine. Seems it's impossilbe to run it aboslutely calm, but at least it doesn't die down low. Can fly from Dover to London and back again without a single sign of a damaged engine at 2000m or below. The only thing that seems to be damaged is my crappy graphics card that can barely run CoD even at low settings where the landscape looks far worse than Il-2 on low
