These are connected by a timing belt or chain, which you may have come across before. The camshaft pulley is one of the most important things connected to the crankshaft. These convert the reciprocal energy into rotational force, which powers the wheels and drives pulleys for running the engine’s other processes. The pistons are attached to the crankshaft by conrods (short for “connecting rods”). The exhaust valve thus opens, expelling them as the piston rises back up. Now that the piston is back at BDC, the burnt gases must go somewhere. The spark plug then fires, combusting the combined air and fuel and forcefully driving the piston downwards. The valve then closes as the piston rises, compressing the mixture into a tiny space between the piston head and the cylinder top. The piston is at or near the lowest point in its cycle, known as Bottom Dead Centre – BDC. How Do Internal Combustion Engine Strokes Work?ĭuring the intake stroke, a valve (again, using the simplest engine model available) opens to allow an air/fuel mixture into the cylinder. Colloquially, these are known as suck, squeeze, bang, and blow. The pistons go through four phases or strokes: intake, compression, power (or “combustion”), and exhaust. In an Inline-4 engine, the pistons travel up and down (“reciprocally”) within the cylinders in pairs, although each is doing something different. Specifically, this type is generally called an Inline-4 or I4. See the video above for a straightforward overview.Ī simple engine contains four cylinders and is known as an “inline” or “straight” model. Before exploring variable valve timing and how the oil control valve regulates it, it’s crucial to grasp how an engine works.
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