360° vs 180° vs 270° Parallel Twin: Crankshaft Angles | Explained
A straight-twin engine, also known as an inline-twin, vertical-twin, or parallel-twin, is a two-cylinder piston engine with cylinders arranged in a line along with a common crankshaft. Straight-twin engines are primarily used in motorcycles; other uses include marine vessels, snowmobiles, Jet Skis and all-terrain vehicles.
The term "parallel-twin", "vertical-twin," and "inline-twin" originally had specific meanings relating to the crankshaft angle or engine orientation; however, they are often also used interchangeably.
Various crankshaft configurations have been used for straight-twin engines, the most common being 360 degrees, 180 degrees, and 270 degrees.
So in this video, we are looking at different crankshaft configurations and how they are used in the automotive industry.
Time Stamp 00:00 Introduction
01:19 How does a 4-Stroke Engine work?
02:10 Difference between Inline & Parallel Twin
03:02 360° Crankshaft Angle 04:52 180° Crankshaft Angle
07:35 270° Crankshaft Angle 10:59 Wrap Up
All images used in this video are under a creative commons license.
External Sources: Wikipedia Creative Common
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In the United Kingdom, the term "parallel-twin" is traditionally used for engines with a crankshaft angle of 360 degrees since the two pistons are in the same direction (i.e., parallel to each other).
"Vertical-twin" was used to describe engines with a crankshaft angle of 180 degrees, which causes the pistons to travel in opposite directions.