Monday, January 24, 2011

Introduction

How does an engine works?
How does the engine start up in the first place?
How does the reciprocating motion of the piston converts to rotary motion of the propeller?
How does the piston gains its momentum from?
How? When? Where? What? Who?

Ever came across your mind before?
We'll provide you with the best, relevant answers as possible.

Firstly, if you want to know what is really going on inside the engine or
technically, the cylinder, click on the following image which will re-direct you
to an animation of a four-stroke engine cycle.
Note: Set the play speed to its minimal and just observe 1 cylinder will do!


What about 2-Stroke Engines?
    2-Stroke Engine cycle in comparison to 4-stroke Engine:

2-Stroke Engine
4-Stroke Engine
2 strokes to complete 1 working cycle
4 strokes to complete 1 working cycle
Air intake through scavenge ports
Air intake through suction valves
Low Speed Engines
High Speed Engines
Higher power
Lesser power
Expensive parts
Cheaper parts


Advantages of 2-stroke Engines in comparison to 4-stroke engines:

1.  No suction valves, hence simple construction.
2.  Have a high power-to-weight ratio (engine has twice as many combustions per second as a four stroke engine revolving at the same speed).
3.  Have the potential for about twice the power in the same size (twice as many power     strokes per revolution).
4.  Lighter, and cost less to manufacture.

Disadvantages of 2-Stroke Engines in comparison to 4-stroke engines:

1.  Shorter lifespan as compared to four-stroke engines (parts wears out faster due to the lack of a lubrication system).
2 . Require a mix of oil with the gas to lubricate the crankshaft, connecting rod and cylinder walls.
3.  Costly.
4.  Less fuel efficiency.
5.  Produce more pollution.

6 comments:

Lassia said...

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Unknown said...

This blog is really very informative and I would like to tell that I have recently found a site who is providing diesel engine parts.
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Unknown said...

n a conventional marine diesel engine the power is produced by hot compressed air igniting fuel sprayed under very high pressure into the cylinder head. A marine diesel engine does not use a carburetor to mix fuel and air or spark plugs to ignite the mixture. Instead it employs the pistons to compress the air to 3000 kPa which causes it to become extremely hot and the fuel is ignited as soon as it is injected into the cylinder.

Some marine diesel engines are fitted with a heater plug in the inlet manifold or a glow plug in the pre-combustion chamber of each cylinder to provide additional heat to the combustion air during starting.

Diesel engines are heavier and slower revving than petrol engines but they are also more reliable because they do not rely on external carburetion or an electrical spark for ignition.


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Strike Fuels said...

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It is interesting information about Marine Diesel Engine.
I am looking your another post on this topic.
Thanks for sharing !
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Abinesh M said...

nice it is really understandable
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Umer said...

nice blog but i want to know that is there any Preventive Maintenance Checklist for 2 stroke or 4 strock engine