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Mount Vernon, WA | 'fraid not. You missed my earlier point, and that is, the INTERNAL parts (e.g. pistons, valves, etc.) run at very similar temps in both air cooled and liquid cooled engines. Just because a wet liner is surrounded by 200 degree coolant, that does NOT mean that the cylinder wall is also 200 degrees. If combustion temps peak at over 1000 degrees, then cylinder wall temps are considerably higher than 200 degrees. Similar in a Deutz, the wall temps are higher than 300. As the heat radiates away from the walls and into the fins, the temps cool to 300.
Also, OIL is the primary cooling medium for internal engine parts (e.g. piston cooling jets). If both Cummins AND Deutz specify a 250ish maximum temperature, that tells me that the internal parts operate at very similar temps.
I remain convinced that liquid-cooled and air-cooled diesel engines enjoy similar combustion efficiencies (i.e. fuel economy). The only real advantage to a Deutz in my opinion are the elimination of cavitation erosion (virtually a non-issue in today's liquid engines), and the increased reliability due to fewer cooling system parts. Of course, liquid cooled engines have other advantages which I will not list here.
Again, if the fuel economy advantage was that great, you'd see an air-cooled something in a class 8 diesel truck. Truck makers will spend millions to get even a few percent increase in mileage. Haven't heard any rumors about air cooled engines being considered for a Kenworth. | |
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Deutz Air Cooled Irrigation Engines ?
