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#1
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Rad hose?
Picked up a Dart bracket car with a 440. The lower rad hose was a flex type that was collapsing when the rpm's were raised up. I replaced it with a good preformed hose with a spring inside. It still collapses. Any ideas?
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#2
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It may just have too sharp a bend in it or may be too weak and soft. Once it starts to collapse even a spring may not help it later. I'd try a new hose with a spring and see how it does.
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#3
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be sure the rad cap is working properly, it has to hold pressure and vent when necessary......djs
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#4
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The molded hose is brand new. I'll try a new cap.
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#5
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if radiator is plugged up, then water pump suction pressure may cause hose to collapse. Hard to believe a new hose with spring would collapse otherwise.
Does the water pump have a thermostat in it? |
#6
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From another website:
"The second part of the story that has led to the "I need a spring" myth is that some people have observed their lower hose collapsing when they rev the engine. This is the result of a clogged radiator or a cooling system that has not been brought up to standard operating temperature. If an engine is revved up while still cool, there is only atmospheric pressure in the system. It is possible for the lower hose to collapse slightly due to the water pump drawing water out of the lower hose faster than the gravity-fed water from the radiator replaces it. Once the engine has been warmed up, the coolant system operates under pressure and this condition doesn't exist in a properly maintained cooling system. However, if the radiator tubes have restrictions, as the engine is revved, the water pump pulls coolant from the lower hose faster than water can trickle past the clogged tubes. This can result in a reduction in internal pressure that would cause the hose to collapse." |
#7
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The other problem with that is that if a pump is sucking in a circular system, there must be pressure going somewhere...
A closed thermostat would prevent flow, of course, but pressures should be equalised to at least some degree. |
#8
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if there is no thermostat, then it may allow the waterpump to push more water, and draw a larger suction pressure, to help collapse the hose.
also, may need to make sure system is vented of the air. I drilled a tiny 1/16 inch hole in my TS, which allows the air to vent from beneath the TS when filling with water. Car ran cooler quicker when I hit the street. |
#9
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I don't understand that...
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#10
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#11
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i usually run a gutted thermostat in alot of my modded up cars, try that.
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#12
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T-stat was gutted by P.O. I flushed the system when I first got the car. Not a lot of crud came out. I took the car out for a bit of a drive, it didn't get hot. Hmmm.
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#13
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Maybe when warms up, the increase in coolant pressure keeps the hose from collapsing.
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