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The engine should be mounted so that the moment transmitted from the engine to the mount
can be on the broadest base as possible [?]. The shock mounts used should be as stiff as
possible, because the engine vibration can result in a mounting that is not secure. This leads
to problems with the fuel mixture (i.e. foaming of the fuel, uncontrolled flapping of the fuel
pump membrane) and with that to unsafe operation of the engine.
-Recommendation:
The engine is bolted to a plate which is about twice the size as the underside of the engine (the
wider the better). On the two outsides of the plates, there should be six or more rubber
dampeners, three on each side, in line. This entire assembly will be fastened through the
rubber dampener elements onto another plate which in turn is tightly connected to the
apparatus.
1.2.2 Airflow to the Engine
The engine has to be installed in such a way that the fresh air stream supplied is sufficient to
insure its cooling and adequate for the supply of air to the carburetor.
For a cooled installation it is necessary to take care that the outgoing hot cool air stream is not
allowed into the carburetors, since that will lead to a drastic reduction in performance. At the
same time, the outgoing hot cool air stream must be able to exit the cowling without blockage,
since this will force the engine to overheat and lead to its destruction.
The engine's forced air cooling system is designed so that if enough fresh air flows in, the
satisfactory cooling of the engine is insured in any type of operation. No changes may be
made in the cooling system.
It is absolutely imperative to have a sufficient supply of fresh air.
1.2.3 Fuel System Layout
The fuel supply of the engine is supported by a diaphragm pump (Illus. 1.2.3-1), operated by
pressure from the crankcase.
Illustration 1.2.3-1 (Diaphragm Fuel Pump)
Impuls connection
This fuel pump is situated in the fuel line between the fuel tank and carburetor. A fuel filter
should always be installed between the diaphragm pump and fuel tank. The diaphragm pump
should be installed at a place with the least influence of vibration or heat.
Take care to insure that, with an upright installation of the diaphragm pump, the fuel exit is on
top. The placement of the connecting pieces can be recognized by arrows on the casing.
The central connection of the fuel pump is the impulse connector. The impulse line from the
crank case to the diaphram pump should be as short as possible, straight and inclining toward
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