Quote:
Originally Posted by secondchance
When I dug up the thermostat I realized I had drilled 4 holes and not 3. I believe this is a 180 degree stat.
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So...you always have a bit of flow through the radiator......... say four 1/8 inch holes or .0123 square inch additional opening total. It is amazing that the heater (hot side at the thermostat) is only a 1/4 inch diameter port or about .049 square inches total port area. That is about 4 times what you have with the 1/8 inch holes if you turn your heater on full blast.
The bit of flow you have all the time will run the coolant just a tad cooler so the thermostat will open just a bit later. Then as the thermostat approaches fully open the total flow is just a bit more adding in the .0123 square inches with the 1/8 inch holes (.0123 + 1.17 =1.18 square inches).
I am not seeing exactly what the benefit of the 1/8 inch holes gives you given the total flow area of an open thermostat may be over 1.17 square inches and with your four 1/8 inch holes now 1.18 square inches
I can see the thermostat opening a bit more smoothly having the 1/8 inch holes and not opening and closing as rather cold coolant is mixing with hot coolant as the thermostat initially starts to open
