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- Compression_ratio abstract "The compression ratio of an internal-combustion engine or external combustion engine is a value that represents the ratio of the volume of its combustion chamber from its largest capacity to its smallest capacity. It is a fundamental specification for many common combustion engines.In a piston engine, it is the ratio between the volume of the cylinder and combustion chamber when the piston is at the bottom of its stroke, and the volume of the combustion chamber when the piston is at the top of its stroke.For example, a cylinder and its combustion chamber with the piston at the bottom of its stroke may contain 1000 cc of air (900 cc in the cylinder plus 100 cc in the combustion chamber). When the piston has moved up to the top of its stroke inside the cylinder, and the remaining volume inside the head or combustion chamber has been reduced to 100 cc, then the compression ratio would be proportionally described as 1000:100, or with fractional reduction, a 10:1 compression ratio.A high compression ratio is desirable because it allows an engine to extract more mechanical energy from a given mass of air-fuel mixture due to its higher thermal efficiency. This occurs because internal combustion engines are heat engines, and higher efficiency is created because higher compression ratios permit the same combustion temperature to be reached with less fuel, while giving a longer expansion cycle, creating more mechanical power output and lowering the exhaust temperature. It may be more helpful to think of it as an "expansion ratio", since more expansion reduces the temperature of the exhaust gases, and therefore the energy wasted to the atmosphere. Diesel engines actually have a higher peak combustion temperature than petrol engines, but the greater expansion means they reject less heat in their cooler exhaust.Higher compression ratios will however make gasoline engines subject to engine knocking if lower octane-rated fuel is used, also known as detonation. This can reduce efficiency or damage the engine if knock sensors are not present to retard the timing. However, knock sensors have been a requirement of the OBD-II specification used in 1996 model year vehicles and newer.On the other hand, Diesel engines operate on the principle of compression ignition, so that a fuel which resists autoignition will cause late ignition, which will also lead to engine knock.".
- Compression_ratio wikiPageExternalLink v=onepage&q&f=true.
- Compression_ratio wikiPageExternalLink s-cr.html.
- Compression_ratio wikiPageExternalLink cam-tech.htm.
- Compression_ratio wikiPageExternalLink SVC.
- Compression_ratio wikiPageID "6863".
- Compression_ratio wikiPageRevisionID "606659701".
- Compression_ratio hasPhotoCollection Compression_ratio.
- Compression_ratio subject Category:Engine_technology.
- Compression_ratio subject Category:Engineering_ratios.
- Compression_ratio subject Category:Piston_engines.
- Compression_ratio type Artifact100021939.
- Compression_ratio type Device103183080.
- Compression_ratio type Engine103287733.
- Compression_ratio type Instrumentality103575240.
- Compression_ratio type Machine103699975.
- Compression_ratio type Motor103789946.
- Compression_ratio type Object100002684.
- Compression_ratio type PhysicalEntity100001930.
- Compression_ratio type PistonEngines.
- Compression_ratio type Whole100003553.
- Compression_ratio comment "The compression ratio of an internal-combustion engine or external combustion engine is a value that represents the ratio of the volume of its combustion chamber from its largest capacity to its smallest capacity.".
- Compression_ratio label "Compressieverhouding".
- Compression_ratio label "Compression ratio".
- Compression_ratio label "Rapporto di compressione".
- Compression_ratio label "Relación de compresión (motores)".
- Compression_ratio label "Stopień sprężania".
- Compression_ratio label "Taux de compression".
- Compression_ratio label "Taxa de compressão".
- Compression_ratio label "Verdichtungsverhältnis".
- Compression_ratio label "Степень сжатия".
- Compression_ratio label "圧縮比".
- Compression_ratio label "壓縮比".
- Compression_ratio sameAs Kompresní_poměr.
- Compression_ratio sameAs Verdichtungsverhältnis.
- Compression_ratio sameAs Relación_de_compresión_(motores).
- Compression_ratio sameAs Taux_de_compression.
- Compression_ratio sameAs Rapporto_di_compressione.
- Compression_ratio sameAs 圧縮比.
- Compression_ratio sameAs Compressieverhouding.
- Compression_ratio sameAs Stopień_sprężania.
- Compression_ratio sameAs Taxa_de_compressão.
- Compression_ratio sameAs m.01_5y.
- Compression_ratio sameAs Q828137.
- Compression_ratio sameAs Q828137.
- Compression_ratio sameAs Compression_ratio.
- Compression_ratio wasDerivedFrom Compression_ratio?oldid=606659701.
- Compression_ratio isPrimaryTopicOf Compression_ratio.