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Carburetors: what's the huff about?

August 28, 2015 6392 Views No comments

What is a carburetor and what does it do?

A carburetor controls the proportion of fuel to air going into an engine. It accomplishes this by regulating the airflow to the engine and adding the appropriate amount of fuel to the air. It's an important mechanism that helps your engine run smoothly by ensuring that the optimal ratio of fuel/air enters the engine. To reach this optimal ratio, the carburetor uses a vacuum. But how does a carburetor actually work? To better understand the basic functions, let's examine the different components that make up a carburetor.

Four-Stroke Engine

August 25, 2015 4236 Views No comments

What is a four-stroke engine and how does it work?

A four-stroke engine refers to the number of strokes a piston makes in one cycle, or in two rotations of the crankshaft. The four strokes are intake, compression, power, and exhaust. During the intake stroke, the piston travels down the cylinder to let fresh air/fuel in through the intake valve (Mechanical Booster). The air/fuel mixture is sucked into the cylinder because "the piston is an airtight seal inside the cylinder... " which "...creates a partial vacuum" (EpicPhysics.com). The compression stroke starts as the piston travels up the cylinder and compresses the fuel/air mixture (Jenkins). Then a "spark plug ignites the..." fuel/air mixture, forcing the piston down the cylinder during the power stroke (Jenkins). It is important to note that the power stroke "... is the only point at which the engine creates energy" (EpicPhysics.com). Moreover, "as the piston moves up and down in the cylinder it rotates the crankshaft" (AutoEducation). Lastly, once the piston completes the power stroke, "the exhaust valve opens" to expel the exhaust gasses (AutoEducation).

Two-Stroke Engine

August 20, 2015 3675 Views No comments

What is a two-stroke engine? And how does it work?

A two-stroke engine refers to the number of strokes the piston needs to complete in one cycle or one rotation of the crankshaft. A stroke is one up or down movement of the piston inside the cylinder. Thus, in a two-stroke cylinder, the piston moves up and down once in one cycle. More specifically, the cycle is comprised of two strokes: the "compression stroke" and the "combustion stroke" (Brain), also known as the power stroke.