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  2. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  3. Engine efficiency - Wikipedia

    en.wikipedia.org/wiki/Engine_efficiency

    The efficiency of internal combustion engines depends on several factors, the most important of which is the expansion ratio. For any heat engine the work which can be extracted from it is proportional to the difference between the starting pressure and the ending pressure during the expansion phase.

  4. Newcomen atmospheric engine - Wikipedia

    en.wikipedia.org/wiki/Newcomen_atmospheric_engine

    To the end of the piston rod was attached a cord passing over two pulleys and a weight hung down from the cord's end. Upon releasing the catch, the piston was sharply drawn down to the bottom of the cylinder by the pressure differential between the atmosphere and the created vacuum; enough force was thus generated to raise a 60 lb (27 kg) weight.

  5. Reciprocating engine - Wikipedia

    en.wikipedia.org/wiki/Reciprocating_engine

    The piston is moving down as air is being sucked in by the downward motion against the piston. Compression: This stroke begins at BDC, or just at the end of the suction stroke, and ends at TDC In this stroke the piston compresses the air-fuel mixture in preparation for ignition during the power stroke (below). Both the intake and exhaust valves ...

  6. Component parts of internal combustion engines - Wikipedia

    en.wikipedia.org/wiki/Component_parts_of...

    A piston is a component of reciprocating engines. It is located in a cylinder and is made gas-tight by piston rings. Its purpose is to transfer force from expanding gas in the cylinder to the crankshaft via a piston rod and/or connecting rod. In two-stroke engines the piston also acts as a valve by covering and uncovering ports in the cylinder ...

  7. Stirling engine - Wikipedia

    en.wikipedia.org/wiki/Stirling_engine

    A loose-fitting displacer shunts the air between the hot and cold ends of the cylinder. A power piston at the open end of the cylinder drives the flywheel. A beta Stirling has a single power piston arranged within the same cylinder on the same shaft as a displacer piston. The displacer piston is a loose fit and does not extract any power from ...

  8. Free-piston engine - Wikipedia

    en.wikipedia.org/wiki/Free-piston_engine

    Free-piston engine used as a gas generator to drive a turbine. A free-piston engine is a linear, 'crankless' internal combustion engine, in which the piston motion is not controlled by a crankshaft but determined by the interaction of forces from the combustion chamber gases, a rebound device (e.g., a piston in a closed cylinder) and a load device (e.g. a gas compressor or a linear alternator).

  9. Build the Earth - Wikipedia

    en.wikipedia.org/wiki/Build_the_Earth

    Minecraft developer Mojang Studios featured the project on their website on Earth Day 2020. [7] In July 2020, YouTuber MrBeast released a video where he and 50 other people built his hometown of Raleigh, North Carolina within the project. [8] In 2020, a full sized recreation of the Taj Mahal was completed on the server by Daniel Tan. [9]