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Article Provides a Simple Explanation for 2-Stroke and 4-Stroke Engines

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Article Provides a Simple Explanation for 2-Stroke and 4-Stroke Engines More Create Blog Sign In Daily Dose of Air Pollution Air pollution is a growing problem in most cities (big and small). The "Daily Dose" aims to disseminate the best available information on air pollution and engage in discussions to better understand the process of air quality management. For more details on the program, please visit http://www.urbanemissions.info MONDAY, DECEMBER 14, 2009 INFORMATION PORTALS Urban Emissions 2-Stroke vs. 4-Stroke Engines India Air Quality Information Delhi Air Quality Information Article provides a simple explanation for 2-Stroke and 4-Stroke engines MOST VISITED IN 7 DAYS 2 Stroke & 4-Stroke Cycle Engines 2-Stroke vs. 4-Stroke Engines Article provides a simple explanation for 2-Stroke and 4-Stroke engines (Source: Columbia Encyclopedia) The Two-Stroke Cycle Th... An MS-Excel Based Calculator to Estimate Air Quality Index The Air Quality Index (AQI) is an "index" determined by calculating the degree of pollution in the city or at the monitoring po... Journal Article - Long-term historical trends in air pollutant emissions in (Source: Columbia Encyclopedia) Asia: Regional Emission inventory in ASia (REAS) version 3 The Two-Stroke Cycle Journal Article - A miniature Portable The two-stroke engine is simpler mechanically than the Emissions Measurement System (PEMS) for real-driving monitoring of four-stroke engine. The two-stroke engine delivers one motorcycles power stroke every two strokes instead of one every four; thus it develops more power with the same displacement, Whats the Difference or can be lighter and yet deliver the same power. For this Between Air Quality and reason it is used in lawn mowers, chain saws, small Air Quality Index? automobiles, motorcycles, and outboard marine engines. However, there are several disadvantages that restrict its Modeling Tools for Air use. Since there are twice as many power strokes during Pollution Analysis & the operation of a two-stroke engine as there are during Management the operation of a four-stroke engine, the engine tends to A number of tools have heat up more, and thus is likely to have a shorter life. been developed to analyze air pollution and estimate Also, in the two-stroke engine lubricating oil must be costs and benefits of an array of mixed with the fuel. This causes a very high level of management options. A number... hydrocarbons in its exhaust, unless the fuel-air mixture is computer calculated to maximize combustion. A highly Journal Article - Ozone a persistent efficient, pollution-free two-stroke automobile engine is currently being developed by Orbital challenge to food security in India: Current status and policy implications Engineering, under arrangements with all the U.S. auto makers. Journal Article - How can Indian The Four-Stroke Cycle power plants cost-effectively meet the new sulfur emission standards? Policy evaluation using marginal abatement cost-curves Journal Article - A framework for analyzing trade-offs in cost and emissions in power sector Journal Article - Implication of emission regulation on cost and tariffs of coal-based power plants in India: A system modelling approach WHAT'S NEW ON DAILY DOSE ► 2020 (55) ► 2019 (11) ► 2018 (44) ► 2017 (60) ► 2016 (303) ► 2015 (122) ► 2014 (170) In most engines a single cycle of operation (intake, compression, power, and exhaust) takes place ► 2013 (122) over four strokes of a piston, made in two engine revolutions. When an engine has more than one ► 2012 (110) cylinder the cycles are evenly staggered for smooth operation, but each cylinder will go through a ► 2011 (194) full cycle in any two engine revolutions. When the piston is at the top of the cylinder at the ► 2010 (133) beginning of the intake stroke, the intake valve opens and the descending piston draws in the air- fuel mixture. ▼ 2009 (192) ▼ December 2009 (21) At the bottom of the stroke the intake valve closes and the piston starts upward on the compression Climate Change Unexplained stroke, during which it squeezes the air-fuel mixture into a small space at the top of the cylinder. (Guardian) The ratio of the volume of the cylinder when the piston is at the bottom to the volume when the Air Pollution Alerts - December piston is at the top is called the compression ratio. The higher the compression ratio, the more 27th, 2009 powerful the engine and the higher its efficiency. However, in order to accommodate air pollution ATMoS-4.0: Simplified control devices, manufacturers have had to lower compression ratios. Atmospheric Transport Disper... Just before the piston reaches the top again, the spark plug fires, igniting the air-fuel mixture Delhi Experiences ~10,900 (alternatively, the heat of compression ignites the mixture). The mixture on burning becomes a hot, Premature Deaths Annuall... expanding gas forcing the piston down on its power stroke. Burning should be smooth and Air Pollution Alerts - December controlled. Faster, uncontrolled burning sometimes occurs when hot spots in the cylinder preignite 20th, 2009 the mixture; these explosions are called engine knock and cause loss of power. As the piston Copenhagen's Carbon Debt = reaches the bottom, the exhaust valve opens, allowing the piston to force the combustion products GHG's of 100,000 Ethiop... —mainly carbon dioxide, carbon monoxide, nitrogen oxides, and unburned hydrocarbons—out of Space-Time Exposure Modelling the cylinder during the upward exhaust stroke. System in London Cooling and Lubrication of Engines Bye Bye Bajaj, Scooter In News.. China: Air Quality, Most small two-stroke engines are air-cooled. Air flows over cooling fins around the outside of the Energy & Transport cylinder and head, either by the natural motion of the vehicle or from a fan. Many aircraft four- Monitoring What We Want to stroke engines are also air-cooled; larger engines have the cylinders arranged radially so that all Manage & Mapping Urban ... cylinders are directly in the airstream. Most four-stroke engines, however, are water-cooled. A 2-Stroke vs. 4-Stroke Engines water jacket encloses the cylinders; a water pump forces water through the jacket, where it draws Air Pollution Alerts - December heat from the engine. Next, the water flows into a radiator where the heat is given off to the air; it 13th, 2009 then moves back into the jacket to repeat the cycle. During warm-up a thermostatic valve keeps Climate Change: What's the water from passing to the radiator until optimum operating temperatures are attained. Final Answer? Four-stroke engines are lubricated by oil from a separate oil reservoir, either in the crankcase, Beijing Cars = Four Million in December 2009 which is a pan attached to the underside of the engine, or in an external tank. In an automobile engine a gear pump delivers the oil at low pressure to the bearings. Some bearings may depend on A Climate Change Reading for oil splashed from the bottom of the crankcase by the turning crankshaft. In a two-stroke engine the Lay People (NPR) lubricating oil is mixed with the fuel. Air Pollution Alerts - December 6th, 2009 ******* Population, Energy, & Climate Change - An Interact... A case study from Dhaka, Bangladesh - Reducing Emissions from Baby-Taxis An Animated Journey Through Earth's Climate Histor... Emission factors for various vehicles SIM-air Paper No.28 - Measuring Autorickshaw Emiss... Posted by Sarath Guttikunda at 8:03 AM Public Awareness of Air Labels: Motorcycles, Pollution Impacts, Urban Emissions Pollution in Seoul, Korea The First Cuts (Indian Express) - No comments: Think Local & Si... Post a Comment ► November 2009 (10) ► October 2009 (12) ► September 2009 (21) Newer Post Home Older Post ► August 2009 (7) ► July 2009 (10) Subscribe to: Post Comments (Atom) ► June 2009 (19) ► May 2009 (28) ► April 2009 (16) ► March 2009 (14) ► February 2009 (16) ► January 2009 (18) ► 2008 (34) AIR POLLUTION TODAY IN Abu Dhabi, Saudi Arabia Bangkok, Thailand Beijing, China Beijing, China (US Emb. Twitter) Bruxelles, Belgium Cyprus Czech Republic Delhi, India (CPCB) Delhi, India (DPCC) Finland and Baltic Region Hong Kong Kolkata, India Kuala Lumpur, Malaysia Lombardia, Italy London, UK Madrid, Spain Mexico City, Mexico Milano, Italy Multiple Cities, Austria Multiple Cities, Belgium Multiple Cities, Canada Multiple Cities, China Multiple Cities, Cyprus Multiple Cities, Europe Multiple Cities, Germany Multiple Cities, Norway Multiple Cities, South Korea Multiple Cities, USA Multiple Regions, Italy Mumbai, India Netherlands Oslo, Norway Paris, France Pune, India Quebec, Canada Roma, Italy Sao Paulo, Brazil Shanghai, China Singapore Starsborg, Germany Switzerland Sydney, Australia Taiwan Tokyo, Japan Toronto, Canada Turino, Italy Victoria, Australia REVELANT LINKS Clean Air Asia (CAI-Asia before) Climate Daily Debate Climate Revolution (India) Daily Dump Green Essentials Green Idea Factory Health Effects Institute In These Times India Together Live from Beijing Peak Energy Pollution Free Cities Rapid Uplift Reinventing Parking Roger Pielke Jr. Roger Pielke Sr. Scientific American TED The City Fix The Daily Climate The Delhi Walla Watts Up With That World Change Cafe World-O-Meters AIR POLLUTION JOURNALS Atmospheric Chemistry and Physics Atmospheric Environment Atmospheric Pollution Research Economic and Political Weekly Energy Policy Environmental Modeling and Software Environmental Science and Policy Environmental Science and Technology Evironmental Development Journal of Atmospheric Sciences Journal of Geophysical Research Transportation and Research - Part D MORE ON URBANEMISSIONS Sarath Guttikunda Sudhir Gota FOLLOW BY EMAIL Email address... Submit FOLLOW ME @ Posts Comments Picture Window theme. Powered by Blogger. HowStuffWorks / Science / Transportation / Engines & Equipment How Two-stroke Engines Work BY MARSHALL BRAIN Disadvantages of the Two-stroke PREV UP NEXT You can now see that two-stroke engines have two important advantages over four-stroke engines: They are simpler and lighter, and they produce about twice as much power. So why do cars and trucks use four-stroke engines? There are four main reasons: Two-stroke engines don't last nearly as long as four-stroke engines.
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