Four Stroke Engines and Cylinder Liners - Bright Hub Engineering PDF

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this course will make you know more about four stroke engines...

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2/22/2021

Four Stroke Engines and Cylinder Liners - Bright Hub Engineering

Four Stroke Engines and Cylinder Liners 2009-10-29

Marine Machinery, Engines & Controls

PAGE CONTENT Introduction Cylinder Liner of 4-S Engine Scavenging in 4-S Engine

Introduction The four stroke engine liners do not require any ports and are relatively simpler in construction as compared to cylinder liners for two stroke engines discussed previously. Instead of ports, a 4-S engine contains valves and the valve timing is controlled by the cams. The upper end of the liner forms a ange of sucient strength to support it. A ange is secured between the cylinder cover and the jacket or engine and the lower part of the liner is free for thermal expansion.

2/22/2021

Four Stroke Engines and Cylinder Liners - Bright Hub Engineering

The liner thickness gives adequate strength to resist the internal gas

Time to

load but at the same time another factor has to be kept in mind that is

Here's

the heat transfer capacity. If the liner is made too thick, it would hinder the smooth transfer of heat and hence it would to thermal stresses in the liner. So the thickness has to be kept at an optimum value which is

4 Most How to

neither too weak nor to thick for eective heat transfer. In four stroke engines the valves are used for scavenging and exhaust of the residual gases. Unlike two stroke engines, it requires four strokes of the engine to complete the four processes of the engine cycle namely scavenging, compression, power and exhaust. Thus the valve is placed on the cylinder head and no cut marks are made on the cylinder liner. The sketch below shows a pictorial description of such a cylinder liner and all the parts are clearly labeled

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therein. Just take a close look at the sketch before studying further, as that would help you to gain a better idea of what is being talked about.

Cylinder Liner of 4-S Engine Scavenging in 4-S Engine In an internal combustion engine, scavenging refers to the complete removal of exhaust gases from the cylinder. As you must have noticed that in four stroke engine cylinder liners, there are no scavenge ports. The scavenging is only done through the inlet valve, ecient scavenging is necessary for good combustion and it is required for the very rst working cycles of the engine. The arrangement for passage of the scavenging air should be such that it should assist cooling of the cylinder, piston and valves. This can be achieved in the most eective manner in the four stroke engines due to the presence of valves. Ad

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TAGS CIVIL EN ELECTRIC MARINE MECHAN

2/22/2021

Four Stroke Engines and Cylinder Liners - Bright Hub Engineering

valve are both open at the same time. Provided that the turbocharger supplies air at a pressure greater than that in the exhaust manifold, a ow of cooling air will pass through the cylinder during this period. In this type of liner design, the scavenging is positive and very ecient, even in very high speed four stroke engines.

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2/22/2021

Four Stroke Engines and Cylinder Liners - Bright Hub Engineering

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i am glade to explain more about the MARINE DIESEL ENGINE & its Design feature in my future article you can get the clear picture of how they are working . thank you • Reply • Share › Arun prakash • 11 years ago

helow sir , i am BE - marine engineering student. i wish to know more about the main engine design and its working . • Reply • Share ›

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