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Two piston rings mounted on a two-stroke engine piston. The ring gap for the bottom ring is visible in the centre of the image. A piston ring is a metallic split ring that is attached to the outer diameter of a piston in an internal combustion engine or steam engine. The main functions of piston rings in engines are:
The main piston has a large piston rod extending downwards from the piston to what is effectively a second smaller-diameter piston. The main piston is responsible for gas sealing and carries the piston rings. The smaller piston is purely a mechanical guide. It runs within a small cylinder as a trunk guide and also carries the gudgeon pin.
Obturator ring being removed from a 100 hp Gnome Monosoupape rotary engine. An obturator ring was a type of piston ring used in the early rotary engines of some World War I fighter aircraft for improved sealing in the presence of cylinder distortion.
For piston engines, an engine's capacity is the engine displacement, in other words the volume swept by all the pistons of an engine in a single movement. It is generally measured in litres (l) or cubic inches (c.i.d., cu in, or in 3 ) for larger engines, and cubic centimetres (abbreviated cc) for smaller engines.
The $1.4 million scheme Dell and his accomplices carried out is only a drop in the bucket. Retailers suffered more than $112 billion in losses due to shrink last year alone, according to the ...
The 366 cu in (6.0 L) big-block V-8 gasoline engine was used in Chevrolet medium duty trucks and school buses. It had a bore and a stroke of 3.935 in × 3.76 in (99.9 mm × 95.5 mm). This engine was made from the 1960s until 2004. The 366 used 4 rings on the pistons, as it was designed from the very beginning as a truck engine.