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The four-stroke engine is more efficient when running at full throttle, while the opposite is the case for the two-stroke engine. When a small car under heavy load runs at half speed, the engine automatically switches to the two-cycle mode, which is then more efficient. The research on this showed a 27% reduction in fuel consumption.
Polaris Inc. is an American automotive manufacturer headquartered in Medina, Minnesota, United States. Polaris was founded in Roseau, Minnesota, where it still has engineering and manufacturing facilities. [ 3] The company manufactured motorcycles through its Victory Motorcycles subsidiary until January 2017, and currently produces motorcycles ...
An illustration of several key components in a typical four-stroke engine. For a four-stroke engine, key parts of the engine include the crankshaft (purple), connecting rod (orange), one or more camshafts (red and blue), and valves. For a two-stroke engine, there may simply be an exhaust outlet and fuel inlet instead of a valve system.
Scavenging is the process of replacing the exhaust gas in a cylinder of an internal combustion engine with the fresh air/fuel mixture (or fresh air, in the case of direct-injection engines) for the next cycle. If scavenging is incomplete, the remaining exhaust gases can cause improper combustion for the next cycle, leading to reduced power ...
Four-stroke cycle used in gasoline/petrol engines: intake (1), compression (2), power (3), and exhaust (4). The right blue side is the intake port and the left brown side is the exhaust port. The cylinder wall is a thin sleeve surrounding the piston head which creates a space for the combustion of fuel and the genesis of mechanical energy.
While Sulzer was well known for its two-stroke engines, in 1931 there was a brief resume of their four stroke diesel engines which had been built alongside the two stroke engines. In 1903 they offered four stroke low speed A-frame style engines from 20 to 800 hp. Enquiries for lighter high-speed engines led by 1911 to forced lubrication four ...
The first person to build a working four-stroke engine, a stationary engine using a coal gas-air mixture for fuel (a gas engine), was German engineer Nicolaus Otto. [4] This is why the four-stroke principle today is commonly known as the Otto cycle and four-stroke engines using spark plugs often are called Otto engines.
Straight-three engine. A straight-three engine (also called an inline-triple or inline-three) [ 1][ 2][ 3] is a three-cylinder piston engine where cylinders are arranged in a line along a common crankshaft. Less common than straight-four engines, straight-three engines have nonetheless been used in various motorcycles, cars and agricultural ...
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