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Encyclopedia > Square engine

The square engine is an engine configuration used on some 4-cylinder motorcycles like the Ariel Square Four. Its easiest to think of a square-four engine as a pair of straight-twin (AKA parallel-twin) engines with their crankshafts mated together using gears to give a common output. Engine configuration is an engineering term for the layout of the major components of an internal combustion engine. ... Ariel etymologically derives from (אֲרִיאֵל, Standard Hebrew Ariʾel, Tiberian Hebrew ʾĂrîʾēl) a unisex name meaning lion of God. ... A straight-twin engine is a two cylinder piston engine that has its cylinders arranged in a single row. ... Crankshaft Continental engine marine crankshafts, 1942 Crankshaft is also the name of a comic strip about an old, curmudgeonly bus driver. ... Spur gears found on a piece of farm equipment. ...


This design was revived as a two-stroke version on some racing Suzukis, and their subsequent road-going version the Suzuki RG500. Although some racing success was achieved, the road bikes didn't sell in great numbers, and the design was phased out in favour of in-line, four-stroke designs, as at the time two stroke engines were quickly being superseded by more economical and reliable four strokes. The two-stroke cycle of an internal combustion engine differs from the more common four-stroke cycle by having only two strokes (linear movements of the piston) instead of four, although the same four operations (intake, compression, power, exhaust) still occur. ... This article needs to be cleaned up to conform to a higher standard of quality. ... The four-stroke cycle of an internal combustion engine is the cycle most commonly used for automotive and industrial purposes today (cars and trucks, generators, etc). ...


The engine is only referred to as "square" when four cylinders are utilised, otherwise the engine is a U engine. A U engine is a piston engine made up of two separate straight engine engines (complete with separate crankshafts) joined by gears. ...


An engine can also be referred to as "square" when the bore and stroke are exactly equal. See Oversquare and Undersquare articles for comparison. A piston engine is oversquare or shortstroke if its cylinders have a greater bore (width, diameter) than stroke (length of piston travel). ... A piston engine is undersquare or longstroke if its cylinders have a smaller bore (width, diameter) than stroke (length of piston travel). ...

Piston engine configurations
Straight 2, 3, 4, 5, 6, 8, 10, 12, 14
V 2, 4, 6, 8, 10, 12, 16, 20, 24
Flat 2, 4, 6, 8, 12, 16
W 8, 12, 16, 18
Other inline H, VR6, Opposed, U (Square)
Other Radial, Rotary, Pistonless (Wankel)

  Results from FactBites:
 
Oversquare - Wikipedia, the free encyclopedia (240 words)
An oversquare engine is generally more reliable, wears less, and can be run at a higher speed; though with the aid of modern technology, the disadvantages of undersquare or longstroke engines have been overcome.
In oversquare engines power does not suffer, but low-speed torque does to some degree, since torque is relative to crank throw (distance from the crank center to the crankpin)—the leverage, essentially.
An oversquare engine cannot have as high a compression ratio as a similar engine with a much higher stroke ratio, and using the same octane fuel.
  More results at FactBites »


 

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