Originally Posted by mmerlinn
The only problem with running without a thermostat is that you may be running with your coolant temperature too low as the role of the thermostat is to maintain a constant higher set temperature. No thermostat means variable lower temperatures dependent upon external ambient temperatures.
There is one other issue when running with no t-stat. If you look at a thermostat you'll notice that the valve is inside a ring. When open the size of the hole is smaller than the size of the housing. This difference in size creates some "back pressure" in the block. This back pressure makes the coolant circulate better in the block, especially in the back of the block. Running without a t-stat can actually cause coolant to seem like it "boils over" because of the uneven circulation and cooling between the front and rear of the block. Although not as noticeable in smaller engines it can still happen.
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