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SN95 Cobras
Can I run an inline thermostat in upper hose????????
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<blockquote data-quote="CJK440" data-source="post: 10807846" data-attributes="member: 43980"><p>I can see it removing clutter but am not sure how better cooling can be realized as mentioned in the quoted post. The stock Cobra stat not only works like any other, it also does another job. There is a spring loaded plate with a hole in it that allows bypass water to flow thru but when the stat opens to let radiator water thru, it blocks water flow from the bypass. Sure some may scoot by since the plate does not have a perfect seal but I've got to wonder much this matters since the coolant will flow the path of least resistance and the bulk will be going thru the rad now that the stat is opened.</p><p></p><p>One important thing that needs to be considered is that with a stat in the lower hose, it will regulate flow thru the radiator based on the temp of the cooled water. With a stat in the upper hose, it will regulate the rad coolant flow based on the hot water coming out of the motor. </p><p></p><p>For example, my car has a 180* stat in the lower hose. My coolant sensor is in the crossover pipe. It gets to 210 on the gauge so the coolant picks up about 30*F passing thru the motor.</p><p></p><p>If I put a 180* stat in an upper hose, my gauge which reads coolant temp just before the stat would most likely read very close to the stat rating. Of course my lower hose would be much cooler. If I moved my 180 stat out of the lower hose, in order to see the same hot running temp, I would need to install a 210 in the upper hose...... The point I'm trying to make is that that to maintain a desired cooling temp within the cooling jacket of the block, a 97 Cobra (with an OE lower hose stat design) would need a stat rated quite a bit lower than a 97 GT (stat in the manfold right at the upper hose).</p><p></p><p></p><p>In addition in my mind, I'd be very carefull with deleting the bypass. The bypass allows for some circulation from cold to the stat opening point. This helps keep the coolant in the motor at a consistant temperature. It also passes that coolant right by the stat in the lower hose. 2V motors and pushrod V8's put the stat in the intake manifold coolant passage. In both cases there is some water flow that moves past the stat so it can open on time.</p><p></p><p>I do not have experience with swapping stat locations and deleting the bypass, but I would think that by deleting the bypass and moving your stat away from the motor in the upper line, it is insulated from the engine coolant since you are simply blocking the line. The concern I would have is that the coolant in the block can become extremely hot well before the stat sees any of that temp required to open it. I would imagine that by drilling a series of holes around the outside of the stat would allow for some hot coolant from the engine to at least reach down the hose to the stat pill. Still I would imagine not as good as a design as the OE setup.</p></blockquote><p></p>
[QUOTE="CJK440, post: 10807846, member: 43980"] I can see it removing clutter but am not sure how better cooling can be realized as mentioned in the quoted post. The stock Cobra stat not only works like any other, it also does another job. There is a spring loaded plate with a hole in it that allows bypass water to flow thru but when the stat opens to let radiator water thru, it blocks water flow from the bypass. Sure some may scoot by since the plate does not have a perfect seal but I've got to wonder much this matters since the coolant will flow the path of least resistance and the bulk will be going thru the rad now that the stat is opened. One important thing that needs to be considered is that with a stat in the lower hose, it will regulate flow thru the radiator based on the temp of the cooled water. With a stat in the upper hose, it will regulate the rad coolant flow based on the hot water coming out of the motor. For example, my car has a 180* stat in the lower hose. My coolant sensor is in the crossover pipe. It gets to 210 on the gauge so the coolant picks up about 30*F passing thru the motor. If I put a 180* stat in an upper hose, my gauge which reads coolant temp just before the stat would most likely read very close to the stat rating. Of course my lower hose would be much cooler. If I moved my 180 stat out of the lower hose, in order to see the same hot running temp, I would need to install a 210 in the upper hose...... The point I'm trying to make is that that to maintain a desired cooling temp within the cooling jacket of the block, a 97 Cobra (with an OE lower hose stat design) would need a stat rated quite a bit lower than a 97 GT (stat in the manfold right at the upper hose). In addition in my mind, I'd be very carefull with deleting the bypass. The bypass allows for some circulation from cold to the stat opening point. This helps keep the coolant in the motor at a consistant temperature. It also passes that coolant right by the stat in the lower hose. 2V motors and pushrod V8's put the stat in the intake manifold coolant passage. In both cases there is some water flow that moves past the stat so it can open on time. I do not have experience with swapping stat locations and deleting the bypass, but I would think that by deleting the bypass and moving your stat away from the motor in the upper line, it is insulated from the engine coolant since you are simply blocking the line. The concern I would have is that the coolant in the block can become extremely hot well before the stat sees any of that temp required to open it. I would imagine that by drilling a series of holes around the outside of the stat would allow for some hot coolant from the engine to at least reach down the hose to the stat pill. Still I would imagine not as good as a design as the OE setup. [/QUOTE]
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Can I run an inline thermostat in upper hose????????
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