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A flat-four engine, also known as a horizontally opposed-four engine or boxer engine, [1] is a four-cylinder piston engine with two banks of cylinders lying on opposite sides of a common crankshaft. The most common type of flat-four engine is the boxer-four engine, each pair of opposed pistons moves inwards and outwards at the same time.
An opposed-piston engine is a piston engine in which each cylinder has a piston at both ends, and no cylinder head. Petrol and diesel opposed-piston engines have been used mostly in large applications such as ships, military tanks, and factories. Current manufacturers of opposed-piston engines include Cummins, Achates Power, and Fairbanks-Morse ...
The term opposed four engine may refer to: a flat-4 engine, with two pairs of cylinders diametrically opposed to each other on either side of a common crankshaft; a four-cylinder H engine in which two flat-twin engines are coupled together, one above the other; an opposed-piston engine with four cylinders, and consequently eight pistons
A flat-twelve engine was also produced by Porsche for the 1969-1973 Porsche 917 sports car. Chevrolet used a horizontally opposed air-cooled 6 cylinder engine in its Corvair line during its entire production run from 1960 to 1969 in various applications and power ratings, including one of the first uses of a turbocharger in a mass-produced ...
The horizontally opposed, four-cylinder engines in this family are all identical in appearance, bore, stroke, dry weight, and piston displacement. All feature a bottom-mounted updraft carburetor fuel delivery system. The higher power variants differ only in compression ratio and maximum allowable rpm, plus minor modifications.
The A-40-4 introduced an increase in power to 40 hp (30 kW). The engine later inspired the A-50 and subsequent engines. [1] [2] [4] The A40 featured single ignition until the A-40-5 version, which introduced dual ignition. All engines in this family have a 5.2:1 compression ratio and were designed to run on fuel with a minimum octane rating of ...
The Continental CD-230 is a four-cylinder, horizontally opposed aircraft Diesel engine produced by Continental Motors, Inc. The engine received its type certificate from the US Federal Aviation Administration on December 19, 2012, under the official TD-300-B designation. [1] A later revision adds the TD-300-C with a higher critical altitude. [2]
For aircraft use, a number of experimenters, who were seeking a small, two-cylinder, four-stroke engine, began cutting Type 1 VW engine blocks in half, creating a two-cylinder, horizontally opposed engine. The resulting engine produces 30 to 38 hp (22 to 28 kW). Plans and kits have been made available for these conversions. [20] [21]