Volvo VNM Manuel de l'opérateur télécharger pdf (Page 292)

Engine Start and Operation 285

High Altitude Operation

Engines lose power when operated at high

altitude because the air is too thin to allow

burning as much fuel as at sea level. For

naturally aspirated engines, this loss is about

3 percent per 1000 feet (300 m) increase in

altitude above sea level. Most turbocharged

engines are rated for higher altitudes and

will not lose as much power as a naturally

aspirated engine.

An engine will produce excessive exhaust

smoke at high altitude unless a lower gear

is used. Shift gears as needed to avoid

excessive exhaust smoke.

Closely monitor the gauges during high

altitude operation. The thinner ambient air

reduces the efficiency of the engine cooling

system. Engine overheat or cylinder damage

could occur if the engine is operated at full

load for extended periods at high altitudes in

hot weather. Downshift and reduce vehicle

speed to reduce engine load when driving on

long grades in these conditions. This will

help keep engine air intake manifold and

coolant temperatures within safe limits.

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