Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Compression_ratio> ?p ?o }
- 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 wikiPageLength "18873".
- Compression_ratio wikiPageOutDegree "78".
- Compression_ratio wikiPageRevisionID "707575874".
- Compression_ratio wikiPageWikiLink Adiabatic_process.
- Compression_ratio wikiPageWikiLink Air–fuel_ratio.
- Compression_ratio wikiPageWikiLink Atkinson_cycle.
- Compression_ratio wikiPageWikiLink Autogas.
- Compression_ratio wikiPageWikiLink Autoignition_temperature.
- Compression_ratio wikiPageWikiLink Bar_(unit).
- Compression_ratio wikiPageWikiLink Bore_(engine).
- Compression_ratio wikiPageWikiLink Category:Engine_technology.
- Compression_ratio wikiPageWikiLink Category:Engineering_ratios.
- Compression_ratio wikiPageWikiLink Category:Piston_engines.
- Compression_ratio wikiPageWikiLink Combustion_chamber.
- Compression_ratio wikiPageWikiLink Compressed_natural_gas.
- Compression_ratio wikiPageWikiLink Connecting_rod.
- Compression_ratio wikiPageWikiLink Cylinder_(engine).
- Compression_ratio wikiPageWikiLink Cylinder_block.
- Compression_ratio wikiPageWikiLink Cylinder_head.
- Compression_ratio wikiPageWikiLink Dead_centre_(engineering).
- Compression_ratio wikiPageWikiLink Diesel_engine.
- Compression_ratio wikiPageWikiLink Electronic_control_unit.
- Compression_ratio wikiPageWikiLink Engine_knocking.
- Compression_ratio wikiPageWikiLink Ethanol_fuel.
- Compression_ratio wikiPageWikiLink Experiment.
- Compression_ratio wikiPageWikiLink External_combustion_engine.
- Compression_ratio wikiPageWikiLink Ferguson_TE20.
- Compression_ratio wikiPageWikiLink Fuel_injection.
- Compression_ratio wikiPageWikiLink Gas_compressor.
- Compression_ratio wikiPageWikiLink Gasket.
- Compression_ratio wikiPageWikiLink Gasoline.
- Compression_ratio wikiPageWikiLink Head_gasket.
- Compression_ratio wikiPageWikiLink Heat_capacity_ratio.
- Compression_ratio wikiPageWikiLink Heat_engine.
- Compression_ratio wikiPageWikiLink Indirect_injection.
- Compression_ratio wikiPageWikiLink Internal_combustion_engine.
- Compression_ratio wikiPageWikiLink LaFerrari.
- Compression_ratio wikiPageWikiLink Leak-down_tester.
- Compression_ratio wikiPageWikiLink Mazda.
- Compression_ratio wikiPageWikiLink Mean_effective_pressure.
- Compression_ratio wikiPageWikiLink Methanol.
- Compression_ratio wikiPageWikiLink Michael_May_(racing_driver).
- Compression_ratio wikiPageWikiLink Octane_rating.
- Compression_ratio wikiPageWikiLink Oil_pump_(internal_combustion_engine).
- Compression_ratio wikiPageWikiLink On-board_diagnostics.
- Compression_ratio wikiPageWikiLink Operating_temperature.
- Compression_ratio wikiPageWikiLink Overall_pressure_ratio.
- Compression_ratio wikiPageWikiLink Petrol-paraffin_engine.
- Compression_ratio wikiPageWikiLink Piston.
- Compression_ratio wikiPageWikiLink Piston_ring.
- Compression_ratio wikiPageWikiLink Poppet_valve.
- Compression_ratio wikiPageWikiLink Pounds_per_square_inch.
- Compression_ratio wikiPageWikiLink Pressure.
- Compression_ratio wikiPageWikiLink Pressure_measurement.
- Compression_ratio wikiPageWikiLink Ratio.
- Compression_ratio wikiPageWikiLink Saab_Automobile.
- Compression_ratio wikiPageWikiLink Saab_Variable_Compression_engine.
- Compression_ratio wikiPageWikiLink Sensor.
- Compression_ratio wikiPageWikiLink SkyActiv.
- Compression_ratio wikiPageWikiLink Spark_plug.
- Compression_ratio wikiPageWikiLink Stroke_(engine).
- Compression_ratio wikiPageWikiLink Supercharger.
- Compression_ratio wikiPageWikiLink Tetraethyllead.
- Compression_ratio wikiPageWikiLink Thermal_efficiency.
- Compression_ratio wikiPageWikiLink Tractor_vaporising_oil.
- Compression_ratio wikiPageWikiLink Turbocharger.
- Compression_ratio wikiPageWikiLink Variable_compression_ratio.
- Compression_ratio wikiPageWikiLinkText "CR".
- Compression_ratio wikiPageWikiLinkText "Compr. ratio".
- Compression_ratio wikiPageWikiLinkText "Compression Ratio".
- Compression_ratio wikiPageWikiLinkText "Compression ratio".
- Compression_ratio wikiPageWikiLinkText "Compression".
- Compression_ratio wikiPageWikiLinkText "compression rate".
- Compression_ratio wikiPageWikiLinkText "compression ratio".
- Compression_ratio wikiPageWikiLinkText "compression ratios".
- Compression_ratio wikiPageWikiLinkText "compression".
- Compression_ratio wikiPageWikiLinkText "engine compression".
- Compression_ratio wikiPageWikiLinkText "high compression".
- Compression_ratio wikiPageWikiLinkText "high-compression".
- Compression_ratio wikiPageWikiLinkText "higher-compression".
- Compression_ratio wikiPageWikiLinkText "low-compression".
- Compression_ratio wikiPageWikiLinkText "overall pressure ratio".
- Compression_ratio wikiPageWikiLinkText "variable-compression".
- Compression_ratio wikiPageUsesTemplate Template:Aircraft_piston_engine_components.
- Compression_ratio wikiPageUsesTemplate Template:Automotive_engine.
- Compression_ratio wikiPageUsesTemplate Template:Citation_needed.
- Compression_ratio wikiPageUsesTemplate Template:For.
- Compression_ratio wikiPageUsesTemplate Template:Refimprove.
- Compression_ratio wikiPageUsesTemplate Template:Reflist.
- Compression_ratio subject Category:Engine_technology.
- Compression_ratio subject Category:Engineering_ratios.
- Compression_ratio subject Category:Piston_engines.
- Compression_ratio hypernym Value.
- Compression_ratio type Company.