I have heard of engines overheating when thermostat was missing, but it is not due to the coolant flow going through the radiator so fast it cannot cool down. It is because the block and head and or head gasket have restrictions built into them to equally distribute the coolant. When you run an engine at high rpm's you sure have a lot more coolant flow than you do at low rpm's so it has to have a resistance to control the flow into all the parts that need cooling. The small engines that used thermo syphon cooling take a different head gasket than the same engine with a water pump added and it is the port size in different places that is different . With out a thermostat you would most likely push a lot of coolant through the front part of the engine and very little through the rear . If the heat sensor is in the part with poor flow it will read high. Not an engineers explanation but it should get some points across as to why you always want to have a proper thermostat installed in an engine designed for one.
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Today's Featured Article - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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