EK,
I never really thought abou the thermos too much, other than it was a cool idea. However, you are clearly right, the engine will still cool down. I guess the thermos just helps the engine warm up a bit quicker.
I never really thought abou the thermos too much, other than it was a cool idea. However, you are clearly right, the engine will still cool down. I guess the thermos just helps the engine warm up a bit quicker.