Automobile with in high elevation

Khartz Di

@khartz-di-5entBw • Oct 25, 2024

Oct 25, 2024

1.2K

why do automobile suffer power loss with increase i n altitude???

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Ramani Aswath

@ramani-VR4O43 • Aug 19, 2012

Oxygen levels are less and the temperature is lower. Both cause problems with the engine performance.
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roon.mech

@roonmech-8faFof • Aug 19, 2012

Khartz Di
why do automobile suffer power loss with increase i n altitude???
hello khartz

Your hp depends upon the density of air in the combustion chamber. so an altitude/temperature rule applies only to naturally aspirated engines.

rule of thumb is for every 1000ft in elevation wt of air drops by 3%
and for every 6 deg increase in temp wt of air drops by 1%

that's because when temperatures increase then the volume of the fluid (air) increases with a decrease in its density
which means hp is going to be affected negatively.
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zaveri

@zaveri-5TD6Sk • Aug 20, 2012

Bioramani sir and roon.mech said it.

Secondly, when a vehicle climbs a slope, then something called the gradient resistance comes into play. it is the resistance offered to the motion of the vehicle by virtue of the angle of slope of the hill. In order to overcome this resistance, more engine torque is required, which consumes more fuel.
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sweet_honey

@sweet-honey-areuMs • Aug 22, 2012

roon.mech
when temperatures increase then the volume of the fluid (air) increases with a decrease in its density
which means hp is going to be affected negatively.
when the air gets hotter, it loses its density and can not expand as much during the explosion. this means that it can't create as much power when it's ignited by the spark plug.
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Ramani Aswath

@ramani-VR4O43 • Aug 22, 2012

sweet_honey
when the air gets hotter, it loses its density and can not expand as much during the explosion. this means that it can't create as much power when it's ignited by the spark plug.
Air does reduce in density. However, what this means is that when it enters the cylinder the initial pressure is less so at the end of compression the compressed pressure and the actual amount of fuel is less. This results in less power output.
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roon.mech

@roonmech-8faFof • Aug 23, 2012

bioramani
Air does reduce in density. However, what this means is that when it enters the cylinder the initial pressure is less so at the end of compression the compressed pressure and the actual amount of fuel is less. This results in less power output.
im not familiar with combustion principles but this made me think as to what would happen if instead of air which contains a mixture of gases, pure oxygen is fed into the combustion chamber (assuming this is a diesel engine). would that multiply its power output?
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Ramani Aswath

@ramani-VR4O43 • Aug 23, 2012

Whatever the fuel, using pure oxygen (with appropriate fuel ratio) will give more power from the same sized chamber.
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