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Tuesday Engine class. Motor Vehicle At Level 2. Tutur D Speight.

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What is the difference between a diesel engine and petrol engine? Petrol engines uses spark plugs to ignite the fuel which is nothing but a mixture of air and petrol.

What is the difference between a diesel engine and petrol engine?

Whereas diesel engines compresses the air which creates a high temperature which in turn ignites the fuel. In brief petrol engine uses spark to ignite the fuel and diesel engines uses compression process to ignite the fuel. What causes smoke from exhaust when accelerating. Blue Smoke From Exhaust. Why you see Blue Smoke From Exhaust If you are seeing Blue Smoke From Your Exhaust this means that your car engine is burning oil.

Blue Smoke From Exhaust

It really does not smell very good and is not good for your health to breath in. This smoke should not be confused with White Smoke you will see when a car first starts up. That White Smoke is just water vapor(Steam) that has collected while the car was parked and will go away as the car engine warms up. Some self help web sites will state that your engine is worn but it may not be. Below are listed some of the reasons for the Blue Smoke. ©Sandor Jackal/Dollar Photo Club 1 - Lots of Exhaust Smoke when starting car - Valve Seals Gone Bad If Smoke from Exhaust appears after you car has been parked for a while this would suggest Bad Valve Seals.

Automotive Mechanics: Combustion chambers. Combustion chambers The combustion chamber is the space between the top of the piston and Cylinder-Head when the piston is on the top dead-center (TDC).

Automotive Mechanics: Combustion chambers

HowStuffWorks "HEMI Pros and Cons" There are many different parts of an engine's design that control the amount of power you can extract from each combustion stroke.

HowStuffWorks "HEMI Pros and Cons"

For example: You want to burn all of the gas in the cylinder. If the design leaves any of the gas unburned, that is untapped energy.You want the maximum cylinder pressure to occur when the crankshaft is at the right angle, so that you extract all of the energy from the pressure.You want to waste as little of the engine's energy as possible sucking air and fuel into the combustion chamber and pushing exhaust out.You want to lose as little heat as possible to the heads and the cylinder walls. Heat is one of the things creating pressure in the cylinder, so lost heat means lower peak pressures.

HEMI Advantages. Hemispherical combustion chamber. Power. The gasoline and spark (Otto cycle) engine's purpose is to make the car go by converting the chemical energy of fuel and air into energy of motion.


Torque and power are important measures of the engine's capability. Torque is rotational moment due to rotational force about a shaft. The pistons and crank turn reciprocating motion and force into torque at the crankshaft. Torque produces work through rotation (analogous to a force producing work through a distance). Power is the rate at which work (energy) is delivered. Power = Torque * angular velocity [note: this is a scalar product] = Torque * 2*pi * rotational speed When using the Imperial units foot-pounds for torque and horsepower for power, and using RPM (revolutions per minute) for rotational speed, the equation becomes: hp = ft-lbs * RPM/5252 In the SI units of Newton-meters for torque and kilowatts (kW) for power, this becomes: kW = N-m * RPM/9549 Other handy relationships are: Lose Weight, i.e., "Add Lightness"

Valve diagram. IMG 0803. IMG 0795. IMG 0792. IMG 0791. The electronic fuel injection system is controlled by com... Four stroke cycle bcmv. Rotary engines are a form of SI petrol engine that do not... Rotary engines are a form of SI petrol engine that do not use a conventional piston.


The type of rotary engine used in many modern cars is based on a design made by a german mechanical engineer, Felix Wankle, in the 1950s. A rotary engine is different from a standard reciprocating engine because it does not have a normal piston. Instead of a piston, it has a three-sided rotor sitting inside a sqashed oval-shaped cylinder called an 'epitrochoid'. Because the rotar has three sides, it is effectively three pistons in one.