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The efficiency of a internal combustion engine varies with size, speed range, compression ratio etc.
Diesel engines use higher compression ratio and operate without throttle control, therefore their efficiency is higher than a equivalent Otto engine.
Large marine (read ship engines) or stationary diesel engine: 50%
Heavy duty diesel engines for marine, stationary and vehicle applications (trucks): 40%
Light duty diesel engines (cars): 30-35%
Gasoline engines: 20-25% + a few % for newer engines
The numbers mentioned above are maximum efficiency, not pedal to the metal efficiency.
Please note that the thermal efficiency of a engine will increase if the combustion chamber surface decrease(!). Higher revs leads to higher forces acting on the piston rings and therefore higher frictional losses, in other words: the mechanical efficiency decreases with increased speed.
What else can I help you with?
Is a combustion engine or a jet engine more efficient?
can't be sure, but i would definably say jet engine, or else they would use combustion engines with propellers on every airplane
What device mixes air and petrol for the internal combustion engine?
The device that mixes air and petrol for the internal combustion engine is the carburetor. It controls the air-fuel ratio to ensure efficient combustion in the engine.
Which are negative impacts that the internal combustion engine has had on society?
efficient travel and noise pollution
What is an example of a sentence using the word Combustion?
Combustion engines are very efficient. Combustion does not provide much energy.
What happens if petrol mix with engine oil in a 4 stroke engine?
If petrol mixes with engine oil in a 4 stroke engine then the mixture becomes thick and its combustion will not be efficient. The exhaust will be smoky due to this incomplete combustion. also this will reduce engine efficiency.
How many gallons of air to burn a gallon of gas in an internal combustion engine?
Approximately 5,000 gallons of air are needed to burn one gallon of gasoline in an internal combustion engine. This air combines with the fuel in a precise ratio for efficient combustion to power the engine.
Successful attempts to make the internal combustion engine more efficient in the 19th century resulted in an increase in the demand for?
Petroleum
What is the most important difference between and internal combustion engine and an external combustion engine?
in internal combustion engine combustion happens internally in cylinder and in external combustion engine combustion happens externally in boiler
What is the most important difference between an international combustion engine and an external combustion engine?
in internal combustion engine combustion happens internally in cylinder and in external combustion engine combustion happens externally in boiler
What type of combustion engine is the steam engine?
It is External-combustion engine.
Internal combustion engine of a gasoline engine?
a gasoline engine is an Internal combustion engine
Is steam power plant is internal combustion or external combustion engine?
A steam engine is an external combustion engine.
