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Engine Mechanical / Electrical / Re: Gate valve install thoughts for cooling water?
« on: May 23, 2017, 12:56:38 AM »
That’s pretty good.
So with a [jet boat open fresh water cooled type system, the only pump is the jet] steam pockets can form at lower temperatures (160F) than say a closed cooling system because the water pressure is lower (at idle/low rpms) thus allowing the hotter areas of the [just the head?] to boil the cooling water which will drop out minerals (or worse). Also, there is less water flow which gives a decrease in cooling water distribution and more and/or hotter hot spots. Is all that right?
How do you know 160F is the temp? And at what pressure is that at? Any other factors that could bump that temperature up or down, aluminum vs. steel heads?
How do you know most marine manufacturers (I assume jet boat open cooling system, only pump is jet) design their engines around a 140-160F thermostats?
So with a [jet boat open fresh water cooled type system, the only pump is the jet] steam pockets can form at lower temperatures (160F) than say a closed cooling system because the water pressure is lower (at idle/low rpms) thus allowing the hotter areas of the [just the head?] to boil the cooling water which will drop out minerals (or worse). Also, there is less water flow which gives a decrease in cooling water distribution and more and/or hotter hot spots. Is all that right?
How do you know 160F is the temp? And at what pressure is that at? Any other factors that could bump that temperature up or down, aluminum vs. steel heads?
How do you know most marine manufacturers (I assume jet boat open cooling system, only pump is jet) design their engines around a 140-160F thermostats?