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Although carburetor technology in automobiles reached a very high degree of sophistication and precision, from the mid-1980s it lost out on cost and flexibility to fuel injection. Simple forms of carburetor remain in widespread use in small engines such as lawn mowers and more sophisticated forms are still used in small motorcycles.
The draught tube routes all blow-by gases back into the intake mixture and is usually located between the air filter and carburetor. Dry sump engines in some drag racing cars use scavenging pumps to extract oil and gases from the crankcase. [18] A separator removes the oil, then the gases are fed into the exhaust system via a venturi tube.
Most choke valves in engines are butterfly valves mounted upstream of the carburetor jet to produce a higher partial vacuum, which increases the fuel draw. [ 1 ] In heavy industrial or fluid engineering contexts, including oil and gas production, a choke valve or choke is a particular design of valve with a solid cylinder placed inside another ...
The term carburetor is derived from the verb carburet, which means "to combine with carbon", [6] or, in particular, "to enrich a gas by combining it with carbon or hydrocarbons". [7] Thus a carburetor mixes intake air with hydrocarbon-based fuel, such as petrol or autogas (LPG). [8]
The most basic carbureted engines, such as older small single cylinder Briggs & Stratton lawn-mower engines, feature a single throttle plate in a basic carburetor with a single venturi. The throttle can be varied and there is always a small hole or other bypass to allow a small amount of air to flow through so the engine can idle if the ...
The combustion cycle can be either two-stroke (which results in a lighter engine for a given power output) [3] [4] or four-stroke (which produce lower levels of exhaust gas emissions). [5] [6] The fuel is usually either petrol or diesel. [7] In 1973, a small Wankel (rotary) engine manufactured by NSU was used in a lawn mower. [8]
Spoiler alert! We're discussing the new Bob Dylan biopic "A Complete Unknown" (in theaters now). If you haven't seen it, don't think twice, bookmark our story for later. What's fact and what's ...
Animation of a two-stroke engine. A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston (one up and one down movement) in one revolution of the crankshaft in contrast to a four-stroke engine which requires four strokes of the piston in two crankshaft revolutions to complete a power cycle.