Marine Diesel Engine Maintenance

Marine Diesel Engine Maintenance

In 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.

Newer engines use an electronic fuel injection system whereby fuel and air are mixed more thoroughly in the pre-combustion chamber before entering the cylinder. This system maximizes power and fuel economy and is also less polluting.

Every boater should have an understanding of how their engine works so let's start by explaining the mechanical cycles.

Most reciprocating piston internal combustion engines work on one of two mechanical cycles-either the four-stroke cycle or the two-stroke cycle. These cycles designate, in correct sequence, the mechanical actions by which the fuel and air gain access to the engine cylinder, the gas pressure - due to combustion - is converted to power and, finally, the burnt gas is expelled from the engine cylinder.

The Basic Four-Stroke Diesel Engine

From its name, it is obvious there are four strokes in one complete engine cycle. A stroke is the movement of the piston through the full length of the cylinder and - since one such movement causes the crankshaft to rotate half a turn - it follows that there are two crankshaft revolutions in one complete engine cycle.

The four strokes in the order they occur are:

1. Inlet stroke. With the inlet valve open and the exhaust valve closed, the piston moves from top dead center (TDC) to bottom dead center (BDC), creating a low-pressure area in the cylinder. Clean, filtered air rushes through the open inlet valve to relieve this low-pressure area, and the cylinder fills with air.

2. Compression stroke. With both valves closed, the piston moves from BDC to TDC, compressing the air. During this stroke the air becomes heated to a temperature sufficiently high to ignite the fuel.

3. Power stroke. At approximately TDC, the fuel is injected, or sprayed, into the hot, compressed air, where it ignites, burns and expands. Both valves remain closed, and the pressure acts on the piston crown, forcing it down the cylinder from TDC to BDC.

4. Exhaust stroke. At approximately BDC the exhaust valve opens and the piston starts to move from BDC to TDC, driving the burnt gas out of the cylinder through the open exhaust valve.

The Two-Stroke Diesel Engine

The two-stroke engine uses two piston strokes to complete one power stroke and, therefore, fire twice as often as a four-stroke engine. A two-stroke engine is smaller and simpler with fewer moving parts. A two-stroke engine has the potential to produce twice as much power as a four-stroke engine of the same size, however, because of the extra fitting required in a two-stroke diesel engine, for example blowers and governors, they become more expensive to produce. There has been a shift towards four stroke diesel engines which have become more efficient and smaller.

Protect Your Marine Diesel Engine

Protect your engine by avoiding long periods (more than 10 minutes) of idling in a "no-load" situation. This is often done to charge batteries or cool refrigeration but if done repeatedly it will glaze the bores of the engine and cause premature engine failure. If the vessel is in a berth the engine can be put in gear to create load at idle.

All boat owners should have an understanding of basic marine diesel engine maintenance to keep themselves and their families safe on the water.

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2011 Lexus LFA Engine Sound.flv

2011 Lexus LFA Engine Sound.flv On YouTube.

Not only does the Lexus LFA deliver thoroughbred supercar performance, the sound it makes is every bit as thrilling. The acoustic performance of the V-10 engine and exhaust system has been fine-tuned to create a unmistakeable soundtrack that rises from a rumbling note at idle to a nape-tingling red-line wail. Twitter: twitter.com Facebook: www.facebook.com Motor Authority is a High Gear Media website: www.highgearmedia.com

Keywords: Lexus, supercars, LFA, V-10, Engine, racing

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Understanding your car's engine control unit (ECU)

Understanding your car's engine control unit (ECU)

These days you are new cars equipped with the latest engine technology to find. The engine of the car is a huge change from the carburetor to the ancient right engine control unit (ECU) is submitted. In the 19 th Century, when the first single-cylinder gasoline engine driver of the vehicle entered into force, was the "carburetor" that has emerged. Later, several cylinders were considered to be a new thing. Finally, in the early '80s, we got a new car, consisting of control -Fuel supply, air and spark to the cylinders ICE. It 'was the injection system that was created to replace the old carburetor. In a multi-point fuel injection system, fuel is injected into the cylinders individually. The fuel injection according to the commands of '"on-board engine management" of the computer. This computer is known as the engine control unit or ECU.

The main occupation of the method is based engine control unit (ECU) is the controlthe different functions of an internal combustion engine. Previously, the ECU, which was installed in most cars and sets the parameters of the engine. In addition, the carburetor should determine the amount of fuel per cylinder / per engine cycle. Injected in other words, the simple version of the controller to control only the quantity of fuel into each cylinder is, for each engine cycle. The progressive nature of the engine control unit (ECU), which are installed on most modern cars are able toControl of ignition timing, variable value timing (VVT) and other peripheral devices.

The ECU (engine control unit) controls the engine through sensors, so that it can obtain information about the amount of car fuel, ignition timing and other parameters to be collected. The controller uses the input data received from sensors located in the engine. The various types of sensors that are mounted above the engine, MAP sensor, position sensor, throttle, airTemperature sensor, oxygen sensor and many others. The sensors are integrated into the engine, in principle, the purpose of determining the various "conditions of engine operation and performance. These sensors monitor the various aspects, such as ambient air temperature, engine / coolant temperature , exhaust / main fold-temperature, exhaust O2 content, throttle position, using the engine speed, vehicle speed and engine. The ECU (Engine Control Unit) control method,where you control the output of a system to control the inputs of a system. Since the ECU (engine control unit) collects data from various sensors, he knows all about the temperature of the coolant, the amount of oxygen in the exhaust gases. Based on these existing data, start the ECU (Engine Control Unit) implementing the massive computing per second. Based on the interpretation of all the programmed input data available, the ECU (engine control unit) to the desired positioncontrols used to throttle the engine and power, and thus to help achieve a satisfactory performance of the motor car.

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Combustion System Model - How to improve engine efficiency

Combustion System Model - How to improve engine efficiency

You smoke your car beyond its efficiency? Now, in a way that you are the problem existing pollution, which in turn affect our health when it added. You need to burn your model of vehicle so that the pump efficiency of the engine.

A reduction in the combustion of fuel is not only the motor vehicle efficiency, but also help save fuel and pollution control to a large extent. With the government and customerspaying more attention to engine efficiency and pollution, car makers are under enormous stress. The car's engineers are now opting for a new software to design and test ideas before finalizing the engine type.

Low emissions are what customers started demanding car manufacturers try to match their list of requirements. Building an engine with low emissions and combustion requires a fundamental understanding of kinetics.

We must first understand what we mean by the engineEfficiency. And 'the amount of electricity generated when the energy supply in comparison. This is measured in terms of burning, the total amount of fuel through the vehicle. The average combustion engine, it creates only 20 percent of the fuel into electrical energy. The rest is thrown from the vehicle emissions.

With more and more people interested in energy efficiency and not only seek to reduce emissions, engineers, engines, which are the high efficiency design andissue. Obtained with bio-fuels, liquefied natural gas, synthetic gas from coal and hydrogen instead of gasoline or diesel fuel helps to reduce emissions and, in turn, increases the vehicle.

Hydrogen car fuel cell shown compatible efficient than regular gasoline powered cars. This is mainly because these fuel cells have no moving parts and are therefore more reliable and less likely to fail. Even car hydrogen fuel cells have a low burn rateand high efficiency of the engine.

Similarly, zero-emission vehicles is also a good way to reduce prices and thereby increase the combustion efficiency of your vehicle. These models work with the help of electricity and running with a range of over 250 miles. They are also easy to maintain and can also reduce fuel costs.

BMW came up with a way to recycle waste heat to drive a car. He developed a system that has been used to produce the waste heatHigh-pressure steam. Heat is then extracted from the exhaust and the steam produced was used to keep the engine.

According to BMW, this system helps improve the overall efficiency of over 15 percent. The result of an efficient engine performance is good, a lot of savings with regard to the monetary aspects involved ... and yes lucky you are!

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