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 - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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