There used to be a gravel pit near my house when I was growing up. They had an old Cat diesel bulldozer down in the pit, and it started with a gasoline pup motor. Winter nights averaged -30 Fahrenheit, so the starting went like this. First spray ether down the carb throat of the gasoline pup motor and get it running. After it had ran for 10 minutes to warm up, let the clutch out to start turning over the diesel engine. (There was always a tin can over the diesel stack). After 15 or 20 minutes of turning over, the diesel would fire--sounded like a bomb going off, and a great belch of black smoke come out of the stack. I firmly believe that if the guys whizzing around the earth in the space station looked out their window at the right time, they would probably see some of those tin cans whizzing around with them.