Straight-twin engine | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-07-05

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Straight-twin_engine


00:01:31 1 Advantages and disadvantages
00:02:10 2 Construction
00:02:20 2.1 Bearing configuration
00:03:09 3 Motorcycle use
00:03:19 3.1 Terminology
00:04:36 3.2 History
00:07:27 3.3 Comparison of twins in motorcycle use
00:08:16 4 Crankshaft angle
00:11:46 4.1 360° and 180°
00:15:03 4.2 270°
00:18:56 4.3 Two-stroke engines
00:19:44 4.4 Engine in line with frame
00:20:36 5 Automobile use
00:23:15 6 Marine engine use
00:24:27 7 Aviation use
00:25:16 8 Other uses
00:25:58 9 See also



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SUMMARY
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A straight-twin engine, also known as straight-two, inline-twin, vertical-twin, or parallel-twin is a two-cylinder piston engine which has its cylinders arranged side by side and its pistons connected to a common crankshaft.  Compared to V-twins and  flat-twins, straight-twins are more compact, simpler, and usually cheaper to make, but may generate more vibration during operation.
Straight-twin engines have been primarily used in motorcycles, but are also used in automobiles and in powersports applications.  Automobiles with straight-twin engines are usually very small and include city cars and kei cars.  Recent examples of cars with straight-twin engines include the Tata Nano and Fiat Group automobiles using the TwinAir engine. Powersports applications include use in outboard motors, personal water craft, all-terrain vehicles, snowmobiles, and ultralight aircraft.
Different crankshaft angles are used in four-stroke straight-twins to achieve different characteristics of firing intervals and engine balance,  affecting vibrations and power delivery.  The traditional British parallel twin (1937 onwards) had 360° crankshafts, while some larger Japanese twins of the 1960s adopted the 180° crankshaft.  In the 1990s, new engines appeared with a 270° crankshaft.