Re: 1962 340 hp thermostat
I basically have the same question.
Recently I replaced the fan-clutch system on my 1998 S10 pickup (4.3L eng., 5-spd. M.T.) with a dual electric fan assembly made for a 1998-2004 Dodge Intrepid and some modifications to my fan shroud. At the same time I replaced the 195 degree thermostat with a "Murray Ultra Premium" thermostat (part # 15119, 195 degrees) that I bought at O'Reilly Auto Parts that has a "Larger than OEM opening allowing for up to 50% increase in coolant flow". During normal driving this summer my temperature gauge stays at about 195 degrees except when I am in stop and go traffic on a hot day which then kicks on the dual electric fans when the gauge reaches about 205 to 210 degrees. Prior to the fan assembly conversion the temperature gauge was always at about 195 degrees in the summer (highway driving as well as stop and go driving). How does "an increase in coolant flow" at the Murray Ultra Premium thermostat help while the temperature remains the same? The coolant flow rate varies with the rpm's of the engine water pump assuming the thermostat is operating correctly and is not stuck in the closed position. The coolant flow rate (Q (in gpm) = AV) before the thermostat would be the same as the coolant flow rate after the thermostat (assuming the same RPM) since it is a closed sysyem. In my opinion the only change using the Murray thermostat with the 50% larger opening (A = x-sect. area) would be a decrease in the velocity (V) at that point.
Q = (A1) x (V1) = (A2) x (V2) where A2 = 1.5 x (V2)
therefore, V2 = 0.667 x (V1)
I basically have the same question.
Recently I replaced the fan-clutch system on my 1998 S10 pickup (4.3L eng., 5-spd. M.T.) with a dual electric fan assembly made for a 1998-2004 Dodge Intrepid and some modifications to my fan shroud. At the same time I replaced the 195 degree thermostat with a "Murray Ultra Premium" thermostat (part # 15119, 195 degrees) that I bought at O'Reilly Auto Parts that has a "Larger than OEM opening allowing for up to 50% increase in coolant flow". During normal driving this summer my temperature gauge stays at about 195 degrees except when I am in stop and go traffic on a hot day which then kicks on the dual electric fans when the gauge reaches about 205 to 210 degrees. Prior to the fan assembly conversion the temperature gauge was always at about 195 degrees in the summer (highway driving as well as stop and go driving). How does "an increase in coolant flow" at the Murray Ultra Premium thermostat help while the temperature remains the same? The coolant flow rate varies with the rpm's of the engine water pump assuming the thermostat is operating correctly and is not stuck in the closed position. The coolant flow rate (Q (in gpm) = AV) before the thermostat would be the same as the coolant flow rate after the thermostat (assuming the same RPM) since it is a closed sysyem. In my opinion the only change using the Murray thermostat with the 50% larger opening (A = x-sect. area) would be a decrease in the velocity (V) at that point.
Q = (A1) x (V1) = (A2) x (V2) where A2 = 1.5 x (V2)
therefore, V2 = 0.667 x (V1)
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