In the
automotive industry
The automotive industry comprises a wide range of company, companies and organizations involved in the design, Business development, development, manufacturing, marketing, and selling of motor vehicles. It is one of the world's largest industry ...
, engine downsizing is the practice of utilizing smaller
combustion engines
An internal combustion engine (ICE or IC engine) is a heat engine in which the combustion of a fuel occurs with an oxidizer (usually air) in a combustion chamber that is an integral part of the working fluid flow circuit. In an internal combus ...
over larger ones of the same
power
Power most often refers to:
* Power (physics), meaning "rate of doing work"
** Engine power, the power put out by an engine
** Electric power
* Power (social and political), the ability to influence people or events
** Abusive power
Power may a ...
capacity when manufacturing
vehicle
A vehicle (from la, vehiculum) is a machine that transports people or cargo. Vehicles include wagons, bicycles, motor vehicles (motorcycles, cars, trucks, buses, mobility scooters for disabled people), railed vehicles (trains, trams), wa ...
s. It is the result of
car manufacturer
This is a list of notable automobile manufacturers with articles on Wikipedia by country. It includes companies that are in business as well as defunct manufacturers. Only companies that have articles here are included.
A
Algeria
* SNVI
...
s attempting to provide more efficient vehicles that emit fewer
emissions
Emission may refer to:
Chemical products
* Emission of air pollutants, notably:
**Flue gas, gas exiting to the atmosphere via a flue
** Exhaust gas, flue gas generated by fuel combustion
** Emission of greenhouse gases, which absorb and emit rad ...
, often mandated by legislative
standards Standard may refer to:
Symbols
* Colours, standards and guidons, kinds of military signs
* Standard (emblem), a type of a large symbol or emblem used for identification
Norms, conventions or requirements
* Standard (metrology), an object th ...
. The term generally relates to traditional internal combustion engines powered by
petrol
Gasoline (; ) or petrol (; ) (see ) is a transparent, petroleum-derived flammable liquid that is used primarily as a fuel in most spark-ignited internal combustion engines (also known as petrol engines). It consists mostly of organic co ...
or
diesel
Diesel may refer to:
* Diesel engine, an internal combustion engine where ignition is caused by compression
* Diesel fuel, a liquid fuel used in diesel engines
* Diesel locomotive, a railway locomotive in which the prime mover is a diesel engin ...
.
Many manufacturers are reducing engine
displacement
Displacement may refer to:
Physical sciences
Mathematics and Physics
*Displacement (geometry), is the difference between the final and initial position of a point trajectory (for instance, the center of mass of a moving object). The actual path ...
and the number of
cylinders
A cylinder (from ) has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a prism with a circle as its base.
A cylinder may also be defined as an infini ...
. By adding a forced aspiration device (
turbocharger
In an internal combustion engine, a turbocharger (often called a turbo) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake gas, forcing more air into the engine in order to pro ...
or
supercharger
In an internal combustion engine, a supercharger compresses the intake gas, forcing more air into the engine in order to produce more power for a given displacement.
The current categorisation is that a supercharger is a form of forced induct ...
) and
direct injection technology, they provide a powerful engine with similar performance to a much larger engine, but with much improved efficiency and reduced
carbon emissions
Greenhouse gas emissions from human activities strengthen the greenhouse effect, contributing to climate change. Most is carbon dioxide from burning fossil fuels: coal, oil, and natural gas. The largest emitters include coal in China and larg ...
. A smaller engine is also often lighter, so less overall energy is expended while driving. Reducing the number of cylinders also reduces the amount of friction in the engine, increasing the efficiency.
Some observers have not been convinced by manufacturer's claims that reducing engine size provides a more efficient car. Some tests have shown that some downsize engines have lower
fuel economy in everyday driving than the larger engines they replace.
Recent research and progress
The
University of Bath
(Virgil, Georgics II)
, mottoeng = Learn the culture proper to each after its kind
, established = 1886 (Merchant Venturers Technical College) 1960 (Bristol College of Science and Technology) 1966 (Bath University of Technology) 1971 (univ ...
published research carried out by its Powertrain and Vehicle Research Centre which demonstrated that it is possible to reduce engine capacity by 60% and still achieve the torque curve of a modern, large-capacity naturally-aspirated engine, while encompassing the attributes necessary to employ such a concept in premium vehicles.
Reliability
In an
Auto Bild
''Auto Bild'' is a leading German automobile magazine based in Hamburg, Germany.
History and profile
''Auto Bild'' was first published on the last week of February 1986. The magazine is published by Axel Springer AG on a weekly basis. The websit ...
investigation of a 1.0
EcoBoost
EcoBoost is a series of turbocharged, direct-injection gasoline engines produced by Ford and originally co-developed by FEV Inc. (now named FEV North America Inc.). EcoBoost engines are designed to deliver power and torque consistent with thos ...
Ford Focus
The Ford Focus is a compact car (C-segment in Europe) manufactured by Ford Motor Company since 1998. It was created under Alexander Trotman's Ford 2000 plan, which aimed to globalize model development and sell one compact vehicle worldwide. The ...
having driven , no major issues were found surrounding the engine, with only 'minimal oil sweating between cylinder and block' being noticed. However, the turbocharged
Audi
Audi AG () is a German automotive manufacturer of luxury vehicles headquartered in Ingolstadt, Bavaria, Germany. As a subsidiary of its parent company, the Volkswagen Group, Audi produces vehicles in nine production facilities worldwide.
Th ...
2.0
TFSI petrol engine has frequently been reported to suffer from more severe oil leakage around the cylinder seals, with up to 1 liter of oil consumed per . Similar issues have been reported for
Volkswagen Group
Volkswagen AG (), known internationally as the Volkswagen Group, is a German multinational automotive manufacturer headquartered in Wolfsburg, Lower Saxony, Germany. The company designs, manufactures and distributes passenger and commercial ...
1.4 and 1.8 TFSI engines. According to a
J.D. Power
J.D. Power is an American consumer research, data, and analytics firm based in Troy, Michigan. The company was founded in 1968 by James David Power III. It conducts surveys of customer satisfaction, product quality, and buyer behavior for the aut ...
survey, downsize engines scored significantly lower in reliability than older engines.
Examples
* The
Volkswagen Group
Volkswagen AG (), known internationally as the Volkswagen Group, is a German multinational automotive manufacturer headquartered in Wolfsburg, Lower Saxony, Germany. The company designs, manufactures and distributes passenger and commercial ...
replaced their 1.6 and 2.0 litre gasoline engines in the late 2000s with the
1.4 TSI unit. It was launched at the 2005
Frankfurt Motor Show
The International Motor Show Germany or International Mobility Show Germany, in German known as the ''Internationale Automobil-Ausstellung'' (''IAA'' – International Automobile Exhibition), is one of the world's largest mobility shows. It cons ...
in a 125 kW (170 PS) version using both a
turbocharger
In an internal combustion engine, a turbocharger (often called a turbo) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake gas, forcing more air into the engine in order to pro ...
and a
supercharger
In an internal combustion engine, a supercharger compresses the intake gas, forcing more air into the engine in order to produce more power for a given displacement.
The current categorisation is that a supercharger is a form of forced induct ...
. Its fuel consumption was 5% lower than the previous 2.0 FSI, despite the increased horsepower throughout the revving range. Later the engine was sold in several versions from 122 to 180 PS, some of them with only the turbocharger.
* In Europe and later in North America
Ford
Ford commonly refers to:
* Ford Motor Company, an automobile manufacturer founded by Henry Ford
* Ford (crossing), a shallow crossing on a river
Ford may also refer to:
Ford Motor Company
* Henry Ford, founder of the Ford Motor Company
* Ford F ...
launched their new
EcoBoost
EcoBoost is a series of turbocharged, direct-injection gasoline engines produced by Ford and originally co-developed by FEV Inc. (now named FEV North America Inc.). EcoBoost engines are designed to deliver power and torque consistent with thos ...
three-cylinder 1-litre engine to the
Ford Focus
The Ford Focus is a compact car (C-segment in Europe) manufactured by Ford Motor Company since 1998. It was created under Alexander Trotman's Ford 2000 plan, which aimed to globalize model development and sell one compact vehicle worldwide. The ...
in 2012, to replace the 1.6-litre and producing the same .
* Since 2011,
BMW has started using 2.0 litre four-cylinder engines instead of 3.0-litre six-cylinder engines, such as the
N20 replacing the
N52 and
N53 engines.
*
Mercedes-Benz
Mercedes-Benz (), commonly referred to as Mercedes and sometimes as Benz, is a German luxury and commercial vehicle automotive brand established in 1926. Mercedes-Benz AG (a Mercedes-Benz Group subsidiary established in 2019) is headquartere ...
has equipped several models with small 1.8-litre four-cylinder engines in lieu of larger V6 engines.
* The
Renault
Groupe Renault ( , , , also known as the Renault Group in English; legally Renault S.A.) is a French multinational automobile manufacturer established in 1899. The company produces a range of cars and vans, and in the past has manufactured ...
R-Type engine is a turbo-charged 1.6 liter
diesel engine
The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to mechanical compression; thus, the diesel engine is a so-call ...
replacing a 1.9 liter engine with similar performance characteristics.
References
{{reflist
Engine technology