What changes the enginesaffects an internal-combustion engine's efficiency?

For a givengasoline internal-combustion engine, that is used as perin accordance with the manufacturersmanufacturer's instructions (specified quality oil, fuel, etc. used), what changes the efficiency of the motor?

For example at higher RPM, the more heat generated due to friction would mean it isn't as efficient as at lower RPM, assince some energy is lost byas heat.

The enginesengine's alignment would also have an impact on the efficiency of the engine -– for example if a carscar's motor is mounted upside down, (ie 180 degi.e., 180° rotated from the camshaftscamshaft's axis of rotation) it won't be as efficient as it would be the right side up. - So So there is some relationship ofbetween engine tilt/misalignment vsand efficiency.

Another factor could be the temperature,: hot engine vs cold engine vs overheating engine. (Also Also does ambient temperature affect the efficiency – e.g., if the same engine is running atin Antarctica vs the Sahara desert, will the efficiency change?)

What other factors might have an influence on the engines efficencyengine's efficiency (disregarding fuel types E10, U95, U98, etc..) additionally, and are thesethey also valid for Dieseldiesel motors?

I've been looking for references with Google's aid, but I haven't found anything that is conclusive.

What changes the engines efficiency?

For a given engine, that is used as per the manufacturers instructions (specified quality oil, fuel etc used), what changes the efficiency of the motor?

For example at higher RPM, the more heat generated due to friction would mean it isn't as efficient at lower RPM, as some energy is lost by heat.

The engines alignment would also have an impact on the efficiency of the engine - for example if a cars motor is mounted upside down, (ie 180 deg rotated from the camshafts axis of rotation) it won't be as efficient as it would be the right side up. - So there is some relationship of engine tilt/misalignment vs efficiency.

Another factor could be the temperature, hot engine vs cold engine vs overheating engine. (Also if the same engine is running at Antarctica vs Sahara desert, will the efficiency change?)

What other factors might have an influence on the engines efficency (disregarding fuel types E10, U95, U98 etc..) additionally are these also valid for Diesel motors?

I've been looking for references with Google's aid, but I haven't found anything that is conclusive.

What affects an internal-combustion engine's efficiency?

For a gasoline internal-combustion engine, used in accordance with the manufacturer's instructions (specified quality oil, fuel, etc. used), what changes the efficiency of the motor?

For example at higher RPM, more heat generated due to friction would mean it isn't as efficient as at lower RPM, since some energy is lost as heat.

The engine's alignment would also have an impact on the efficiency of the engine – for example if a car's motor is mounted upside down (i.e., 180° rotated from the camshaft's axis of rotation) it won't be as efficient as it would be the right side up. So there is some relationship between engine tilt/misalignment and efficiency.

Another factor could be the temperature: hot engine vs cold engine vs overheating engine. Also does ambient temperature affect the efficiency – e.g., if the same engine is running in Antarctica vs the Sahara desert?

What other factors might have an influence on the engine's efficiency (disregarding fuel types E10, U95, U98, etc.), and are they also valid for diesel motors?

I've been looking for references with Google's aid, but I haven't found anything that is conclusive.

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edited Jul 3, 2015 at 2:12

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For a given engine, that is used as per the manufacturers instructions (goodspecified quality oil, fuel etc used), what changes the efficiency of the motor?

For example at higher RPM, due to friction the more heat generated due to friction would mean it isn't as efficient at lower RPM, as some energy is lost by heat.

Also theThe engines alignment would also have an impact on the efficiency of the engine - for example if a cars motor is mounted upside down, (ie 180 deg rotated from the camshafts axis of rotation) it won't be as efficient as it would be the right side up.

- So there is some relationship of engine tilt/misalignment vs misalignmentefficiency.

Another factor could be the temperature, hot engine vs cold engine vs overheating engine. (sameAlso if the same engine is running at antarticaAntarctica vs saharaSahara desert, will the efficiency change?)

What other factors might have an influence on the engines efficency (disregarding fuel types E10, U95, U98 etc..) additionally are these also valid for Diesel motors?

I've been looking for references with Google's aid, but I haven't found anything that is conclusive.

For a given engine, that is used as per the manufacturers instructions (good quality oil, fuel etc used), what changes the efficiency of the motor?

For example at higher RPM, due to friction the heat generated would mean it isn't as efficient at lower RPM.

Also the engines alignment would also have an impact on the efficiency of the engine - for example if a cars motor is mounted upside down, (ie 180 deg rotated from the camshafts axis of rotation) it won't be as efficient as it would the right side up.

So there is some relationship of engine tilt vs misalignment.

Another factor could be the temperature, hot engine vs cold engine vs overheating engine. (same engine running at antartica vs sahara desert, will the efficiency change)