Displacement of the same type of engine is different, 1.4 and 1.6 at the start and the difference in fuel cons Related Questions

Displacement of the same type of engine is different, 1.4 and 1.6 at the start and the difference in fuel cons
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Displacement of the same type of engine is different, 1.4 and 1.6 at the start and the difference in fuel consumption and other aspects of

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What does auto engine displacement mean?
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Why have eight cylinders in an engine? Why not have one big cylinder of the same displacement of the eight cyl
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Look at how the engine works:

The piston in the cylinder on a car goes through four strokes:

1) Intake stroke: The piston moves down as the instake valve opens. This puts air into the cylinder. This is important for the....

2) Compression Stroke: The valves are closed as the piston moves up the cylinder - compressing the air. The fuel injector sprays fuel into the cylinder. When the spark plug goes off, we are at the.....

3) Power Stroke: The piston moves down the cylinder and this is where we get the power to turn the crankshaft. Then we have exhaust fumes in the cylinder, so we have the....

4) Exhaust Stroke: The piston moves back up in the cylinder while the exhaust valve is open, thus pushing the exhaust out into the exhaust system to get rid of it.

If you just had 1 piston doing that, you would only be getting power 1/4 of the time. The whole time, the power would not be smooth. In an 8 cylinder engine, one cylinder might be on it's exhaust stroke while another cylinder is on its power stroke. You can't do that in a 1 cylinder engine.

Matt

You really fuel-efficient small-displacement cars
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You really fuel-efficient small-displacement cars

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What makes the difference bw diesel engine and a petrol engine ?
Asked By niel,Last Answer By Eddie1983 At 2011.03,1 Answers

petrol and diesel are hydrocarbons

the most simple form of hydrocarbon is methane or natural gas it is one carbon atom to four hydrogen atoms

on a molecular level it is one carbon atom with two hydrogen atoms attached to make a hydrocarbon molecule there are a number of different hydrocarbons from gases, plastics, paint to bitumen or tar for the roads the longer the string of hydrocarbons that make up the molecule the thicker the product

petrol is also known as octane as it is eight carbon atoms with 16 hydrogen atoms in its molecular structure

kind of like this

H H H H H H
I I I I I I
H- C C C C C C C C - H
I I I I I I
H H H H H H

this is the molecular of octane that goes into petrol along with benzene and other componds which is why petrol has an octane of around 95/97 as it a % of how much octane there is in the petrol

diesel is similar but has a longer molecular structure usually around 12/13 carbon atoms and the corresponding hydrogen atoms

diesel is very different to petrol it will not ignite by flame or spark as petrol does because the bond holding the molecule together is stronger this is why gases react violently if a spark is present as they will give off their atoms much more readily

thats the science over now about the engines

because of the difference in composition of petrol to diesel the engines require different methods to cause the fuel to combust (explode) so as to provide power

in both petrol and diesel engines there are pistons and valves to control fuel and air into engine and harness the power that the explosion causes

in a petrol engine you have spark plugs, fuel injector/s (depends if single or multi point injection) or a carburetor (an older way of mixing fuel and air)

in a petrol engine you have a four stroke cycle also known as the otteman cycle induction (drawing of fuel and air mixture), compression (compressing the mixture allows it to be more combustive), ignition (spark plug ignites mixture and forces piston down giving power - ignition is also known as the power stroke), exhaust (bi-products of combustion mainly water, caron dioxide and carbon monoxide are sent through exhaust valve)

the petrol and air mixture needs to be a vapour other it won't explode but produce a fire inside the cyclinder which will produce a loss of power and a condition called knocking in the engine

in a diesel engine you don't have spark plugs but do have fuel injectors or pre combustion chambers (in older engines)

the diesel cycle is similar but there is no spark but instead the diesel is sent into cylinder at very high pressure to vapourise it and as the piston compresses the mixture it heats very rapidly until explodes this is why glow plugs are fitted on diesel engines as if the engine is too cold the diesel won't ignite


hope this helps : )

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