Wing Engine Discussion

The only fly in that ointment is that suspended water or water in solution at levels less than around 500 ppm are impossible to detect with the probe type continuity devices like you see fitted to famous filter bowls. What level of contamination they figure is "problematic" I don't know and they aren't talking but I doubt if it is below a few thousand ppm, and that level is enough to destroy pumps and injectors.

I'm sure this was a slip,technically water and oil are not miscible or immicible, so suspended water in oil is a Emulsion, not water in solution. If water was "in solution" with the oil it would be much harder to seperate.

Hi,

There is no argument over that, but:

Two forms of water can be present in fuels: dissolved or suspended as tiny droplets that range in size between 0.1 µm to 10 µm in diameter. This size is so small that it cannot be visually detected except when a highly concentrated haze is formed. The free water is suspended as an emulsion. The more stable the emulsion, the more difficult it is to remove the water. Factors that affect water removal from a water/fuel mixture include interfacial tension, viscosity, relative density and temperature.

The fuel/water mixture's temperature can also affect separation efficiency. As temperature increases the IFT decreases, lowering the water droplets' size. In addition, fuels saturated with water at high temperatures can contain a high concentration of dissolved water, which cannot be removed by liquid/liquid coalescers. As the temperature decreases, the water falls out of solution into a suspended state and can then be removed by a liquid/liquid coalescer.

Above points extracted from: http://www.pall.com/Aerospace_3255.asp

If you are cooling your return fuel flow from the engines and the cooler leaks the fuel it comes into contact with is pretty warm having just come from cooling and lubricating the injectors, the volumes of return fuel varies with engine types but the old two stroke GM's and the bigger CATS pump about 60/70% of the fuel that goes to the engine back to the tank

No, just using industry standard terms to describe a common issue with marine and aircraft distillate fuels.

http://www.gewater.com/pdf/Fact%20Sheets_Cust/Americas/English/FS1677EN.pdf

http://www.jetfuelequipment.com/Shell%20Water%20Detector/Shell%20water%20detector%20test.pdf

Luger Engines

The basic engine comes from John Deere. Luger "marineizes" it with new parts such as intake and exhast headers, exhast, pullies, belts, etc.

Lugger is made by Northern Lights in Seattle, WA. They actually put the engines together, and I think it is a domestic block, but I am not positive on that.

Eric