The Light Weight Engine Houtekietstraat 11
B-8540 Deerlijk, Belgium
EFFECTIVITY page 47
ALL 19-3-2019
The cooling system at 1.2 Bar does not have the same values as different pressure levels !!
D-Motor works with 1.2 bar water pressure.
About water and oil temperature
The D-Motor engines are not high temperature engines. (some new cars are operating with a
water temperature of 140°C). The optimal range is 80°C - 90°C for water and 90°C to 100°C
for oil. In a perfect situation the oil should be 10°C warmer then the water temperature. At
that point the engine is evenly warmed up. If the oil stays to cold, condensation can build up
in the engine. This condensation water in the oil can only be removed from that oil if the oil
temperature is high enough to evaporate the water and remove it.
If the cooling system is large enough to keep oil and water temperature within the limits, a
thermostatic valve for water must always be installed. Reason is that the engine does not
cool down to much during flight. The best practise is to have also a thermostatic valve for the
oil circuit.
About the colour codes ?
The green area is between 70°C (158°F) and 90°C (194°F)
The yellow area is between 90°C (194°F) and 100°C (212°F)
The red area is from 100°C (212°F) on
If the airplane or helicopter cooling system is not dimensioned big enough to keep the
temperature below 100°C (212°F) even at full throttle, then the temperature will continue to
rise during climbing eg. Most pilots do not monitor the displays continiously, but only at
certain intervals.
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