A cold engine turns over slower. Battery only has half its power at 0 degrees F. Slower engine means the electrical system drops to 9 volts or less (if a 12 volt system) or drops so 4.5 volts or less (if a 6 volt system). That produces less maximum spark energy IF a battery-coil system. Possibly NO spark IF a breakerless/electronic conversion. If a magneto systems and the impulse coupler works - the cranking speed has no effect. If the impulse does not work - it has a huge effect.
A slower cranking engine also results in less compression and more chances for small leaks to seep past piston rings and engine valves.
A cold engine with a carburetor has trouble with atomized fuel sticking to the cold walls of the intake manifold and not making it all the way to the combustion chamber.
A cold gas engine with a properly working carb and choke winds up with an over-rich fuel mixture in the combustion chamber. That requires more voltage to fire. Sometimes 30,000 volts instead of 10- 15,000 volts. If the ignition is not perfect -it may not be up to the job.
A diesel? Since a diesel relies on compression to make enough heat for self-ignition - it's pretty easy to see why cold starting can be a huge problem. That why many have electric aux heaters like glow plugs or grid-heaters or intake-manifold heaters.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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