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Straight-three engine
A straight-three engine, also known as an inline-triple,〔Let's Ride: Sonny Barger's Guide to Motorcycling. Sonny Barger, Darwin Holmstrom. HarperCollins, 8 Jun 2010〕〔Superbikes: The World's Top Performance Machines. Alan Dowds. Tangerine Press, 2004〕〔Cycle world, Volume 44. CBS Publications, 2005〕 or inline-three (abbreviated I3 or L3), is a reciprocating piston internal combustion engine with three cylinders arranged in a straight line or plane, side by side.
==Crankshaft angle==
Straight-three engines generally employ a crank angle of 120°. 120° cranks are rotationally balanced; however, since the cylinder fires "one after the other" 1-2-3 (or 1-3-2) the firing pulses have a tendency to induce an end-to end rocking motion. The use of a balance shaft reduces this undesirable effect.
An inline three-cylinder engine with 180° crankshaft can be found in early examples of the Laverda Jota motorcycle made by Italian manufacturer Laverda. In these engines, the outer pistons rise and fall together like a 360° straight-two engine. The inner cylinder is offset 180° from the outer cylinders. In these engines, cylinder number one fires, then 180° later cylinder number two fires, and then 180° later cylinder number three fires. There is no power stroke on the final 180° of rotation. This unusual crank angle came to be due to lack of proper tooling at the factory, which also made vertical twin engines which also utilizes a 180° crankshaft. After 1982, this engine had the regular 120° crank angle.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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