Replaced Quick Connect

[evilunclegrimace]

Oh for ***** sake! You are really reaching Apples and oranges, You are now talking about a positive displacement pump that take a GAS and compresses it into a liquid state in a HIGH pressure system that then uses an orifice to cause a pressure drop to turn it back into a gas. Some thing that does not even remotely occur in a cooling system.

 

[PlayingWithTBI]

Consider an air conditioning system: the thing won't work unless there's a restriction (expansion valve, orifice tube, or something else) that creates a restriction downstream from the pump (compressor). The restriction drops the pressure, it's the "dividing line" between the high-pressure side and the low-pressure side of the refrigeration system. The "low side" is cool/cold, the high-pressure side is warm/hot. Don't tell me that restrictions don't drop pressure, 'cause you can see it with a manifold gauge set. The "high side" can be over 200 psi; and at the same time in the same system, the low-pressure side is going to be 35--45 psi. Shut the engine off, and eventually the pressure equalizes to perhaps 70 or 100 psi (pressure higher or lower depending on ambient temperature.)

Different situation, you're talking about converting liquid into gas (compressible fluid) through an orifice or, expansion valve. As mentioned before, refer to Pascal's Law - with an "INCOMPRESSIBLE" fluid, the pressure has to stay the same. Once the water pump starts moving fluid, unless there's air pockets (or hoses expand which isn't much), immediately converse pressure is generated through the system to the intake of the pump. I know this sounds wrong but it's the law and has been that way longer than SBCs have been in existence. BTW, the only way you can get cavitation is when you're sucking air.

 

[Awest623]

Different situation, you're talking about converting liquid into gas (compressible fluid) through an orifice or, expansion valve. As mentioned before, refer to Pascal's Law - with an "INCOMPRESSIBLE" fluid, the pressure has to stay the same. Once the water pump starts moving fluid, unless there's air pockets (or hoses expand which isn't much), immediately converse pressure is generated through the system to the intake of the pump. I know this sounds wrong but it's the law and has been that way longer than SBCs have been in existence. BTW, the only way you can get cavitation is when you're sucking air.

You are 100% correct. Just took an aircraft hydraulics class covering this not long ago. The only affect a constriction will have on an incompressible fluid is an increase in velocity and parasitic loss. The pressure will remain constant when measured before, during, and after a constriction. Compressible and incompressible fluids behave differently. Technically the bigger hole will result in more hp, not enough to matter at all but whatever

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[evilunclegrimace]

Well, It looks like we have 3 people that understand cooling system basics.

 

[PlayingWithTBI]

The only affect a constriction will have on an incompressible fluid is an increase in velocity and parasitic loss.

And don't forget the smaller the orifice and/or bypass in rings/valves, the more heat is generated. We calculated cooling loads in hydraulic systems based on horsepower (which is directly converted to BTUs) generated plus 10% bypass. We tried to keep velocities under 15ft/sec in piping. Anyway it's all called "Fluid Power" which includes hydraulic, compressed air, and vacuum systems.

 

[PlayingWithTBI]

Well, It looks like we have 3 people that understand cooling system basics.

And you're always admonishing me for giving people ****, ha ha!

 

[90halfton]

 

[Schurkey]

Why is the high-pressure hose on a power steering system expensive, factory-crimped to the metal tubes, and designed for that high pressure, yet the return hose is inexpensive, and attached to the metal tubes with plain ol' cheap clamps?

Power steering fluid is compressible??? Or is the pump output high pressure, and the restriction at the steering gear drops that pressure low enough that a cheap hose can reliably handle the reduced pressure?

 

[evilunclegrimace]

And you're always admonishing me for giving people ****, ha ha!

 

[PlayingWithTBI]

Why is the high-pressure hose on a power steering system expensive, factory-crimped to the metal tubes, and designed for that high pressure, yet the return hose is inexpensive, and attached to the metal tubes with plain ol' cheap clamps?

Because the high pressure side is turning the wheels requiring pressure to develop HP/Torque (hydraulics). The coolant pump doesn't. Damn, I was really trying to stay out of this conversation.