Honda G100K2 Applications Manual page 61

TEMPERATURE
COOLING AIR INTAKE
The engine must be provided with a cooling duct so that fresh air can be drawn directly from outside the
enclosure cover; preventing that cooling air is mixed with the hot air inside the engine enclosure.
Install the cooling air duct with the intake port in a place free from dust and dirt.
A flexible seal should be used to make a tight connection between air duct and engine.
For intake noise emission reduction, it is best that the air duct includes a right angle turn.
The air duct should have a minimum cross-sectional area, as given in the technical data, for unrestricted airflow.
A rule of thumb for the duct size is to divide the engine capacity by factor 1.4 for a single cylinder engine and by
1.7 for a twin cylinder engine.
E.g: twin cylinder GCV 530 divided by 1.7 = 310 cm² air duct surface.
When the engine is operated in dusty areas, install a fixed screen at the intake port of the cooling air duct.
If the screen reduces the opening area, increase the size of the area by an equal percentage.
Air intake
AIRCLEANER AIR INTAKE
In order for the engine to develop the recommended
power and to keep the air cleaner element maintenance
interval, the intake air must be cool and clean.
If the air cleaner does not take its air from the blower
housing, than a air cleaner intake duct should be
provided in the enclosure.
Hot air discharge
HOT AIR DISCHARGE
Hot cooling air must be collected and discharged directly outside the enclosure. Adequate discharge ducts should
be provided.
The minimum cross section of the hot air discharge opening must be larger than the cooling air duct opening.
Position the discharge port and direction so that the hot discharge air does not flow into the intake duct of the
cooling system.
EXHAUST SYSTEM
The exhaust system becomes hot during operation and remains hot for a while after operation.
Separate the exhaust system from the engine compartment and position the exhaust system in the flow route of
the discharged cooling air.
Be sure the exhaust gas is directly discharged outside the enclosure without being blocked or restricted by any
obstacle. The exhaust gas must not flow into the cooling air duct (no re-circulation).
Provide the engine with an exhaust deflector or exhaust pipe extension if necessary.
The direction of the discharged exhaust gas and heated cooling air is important, as it can lead to hot spots on the
frame or equipment and is a potential risk for fire.
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