Diesel Vs Gasoline Engine: Difference, Advantage, Disadvantage

One of the main questions that arise when choosing and buying a car is what type of engine is better diesel Vs Gasoline Engine. 

Both engines use the same principle of internal combustion of fuel but differ in design and performance. It is important for a future car enthusiast to understand how a gasoline engine differs from a diesel one in order to choose the right car that meets specific operating conditions.

Diesel engine Vs Gasoline Engine

difference between diesel and gasoline engine

In general, the device of both engines is the same the crankshaft, which transmits force to the wheels of the car, and rotates by the translational movement of several pistons (the number is from 3 to 12 pieces). The latter are pushed by the energy of hot gases released as a result of the combustion of hydrocarbon fuels. At this point, the difference between a gasoline and a diesel engine appears the supply and combustion of the combustible mixture occur in different ways. we have also Types Of Gasoline For Engines comparison.

diesel engine vs petrol engine working

Both of them are classified as internal combustion engines, but there is some difference in the principle of operation. In gasoline, the air-fuel mixture is formed in the intake manifold. At the end of the compression stroke, air and fuel vapors are mixed. They diverge throughout the entire volume of the cylinder and are compressed, reaching a temperature of 500 ° C, but gasoline does not have enough temperature for combustion, therefore, the design of a gasoline engine has spark plugs – they form a spark and ignite the mixture.

In a diesel engine, air is compressed directly in the cylinder at pressures of 30–50 bar, the fuel is heated to 900 ° C, and at the same time diesel fuel is sprayed from the nozzle in front of the upper dead mark. Interacting with air and rising temperature, the fuel droplets evaporate and a fuel mixture is formed, which ignites on its own. That is, the diesel does not need spark plugs, which makes it insensitive to moisture and independent of electronics.

diesel or petrol engine more powerful

Gasoline engines tend to have more horsepower than diesel engines for the same displacement, but diesel engines have more torque. What is the benefit for the user? Gasoline engines accelerate faster, while diesel engines, like hardworking horses, can pull more weight without losing power. The diesel produces absolutely smooth traction at any speed, ensuring a smooth ride.

is diesel or gas better for cold weather?

The gasoline engine is less susceptible to negative temperatures. Diesel engines are more gentle in this regard, they are susceptible to changes or drops in temperature, but there are winter types of diesel fuel, they do not thicken and allow the use of a diesel engine even in very severe frosts.

Diesel is capricious in frost, but it is not afraid of moisture and condensation, since it does not use a spark during operation, it is only needed to start. Modern models of diesel engines are equipped with glow plugs, heating structures, powerful starters, and batteries, and the engine block is maintained at the desired temperature. In general, if a diesel can start problems with starting at -30°C, then for gasoline only be below -40°C.

gasoline vs diesel engine fuel efficiency

More recently, the cost of diesel was significantly lower than the cost of gasoline, but now there is almost no difference between the cost of the two types of fuel. But diesel consumption is much lower, as it has a high compression ratio of the air-fuel mixture. The efficiency of diesel internal combustion engines is 40% higher due to the doubly higher compression ratio. Diesel fuel consumption is lower by an average of 20%.

are diesel engines noisier than petrol?

No matter how hard automakers try to modify fresh models of diesel engines, they lose to gasoline engines in terms of noise and vibration, especially when idling. Gasoline internal combustion engines are less noisy and without sudden changes in volume. But some drivers find the louder diesel engine an advantage, finding the roar of the engine soothing and soothing.

is diesel worse than petrol for the environment?

If we talk about the purity of the exhaust, then here diesel engines are ahead. Automakers from generation to generation improve engines, bring them to EURO-4 and EURO-5 standards. The most modern engine models are equipped with particulate filters that clean the exhaust. Gasoline engines are far behind in terms of exhaust emissions.

The environmental friendliness of the exhaust is one of the reasons why diesel units are popular in Europe. For example, every third car on French roads is diesel. In Austria, this is every second car. Every year, the share of diesel engines in the European market is growing due to increasingly stringent requirements for the cleanliness of car exhaust.

diesel vs gas engine life expectancy

What lasts longer, diesel or petrol? The resource is higher for diesel engines, on average it is 300-350 thousand kilometers, and some engines can work up to half a million. For gasoline engines, this figure is more modest – 150-250 thousand, and then major repairs are often required.

In many ways, the long service life of diesel engines is possible due to the fact that diesel fuel is oily and provides additional lubrication of parts. A diesel engine has a stronger cylinder block, crankshaft, pistons, and cylinder head since when developing a diesel engine, parts are created taking into account a higher compression ratio than in gasoline engines.

diesel vs petrol engine maintenance cost

Another difference between diesel and gasoline is maintenance, it will cost more. The higher the cost of spare parts and consumables, the quality of diesel fuel should be at a high level. There are fewer craftsmen who can repair diesel engines, and the cost of their services is often higher. According to statistics, diesel engines account for 7-10% of the market. And therefore, there are much fewer masters serving them. Another reason is that the design of a diesel engine is more complicated, and not every minder undertakes to repair it.

Which engine is safer to pour low-quality fuel into?

Diesel is very capricious to low-quality fuel, this is another difference from gasoline. Diesel fuel is divided into summer and winter types, gasoline does not have such a division. Summer diesel fuel begins to thicken already at -15 ° C, and the engine simply will not start, at a lower temperature it is necessary to refuel with a winter type of fuel. In addition, a diesel engine requires clean fuel, it does not tolerate diluted diesel fuel, or low-quality additives, and the engine life decreases from this. It is sometimes possible to fill gasoline engines with low-octane fuel, diluted and with low-quality additives without damage to the engine. Here is a detailed guide on which fuel is better Natural Gas Vs Gasoline Fuel.

gas vs diesel engines advantages and disadvantages

Here we will discuss separate advantages and disadvantages of gasoline and diesel engines.

gas vs diesel engines advantages and disadvantages

advantages and disadvantages of gasoline engines

Combustion of high-octane hydrocarbon fuel – gasoline – allows the engine to develop more power and high speeds. A car equipped with such an engine has better acceleration dynamics than a diesel engine. One condition: the crankshaft must be spun up to 2500–3000 rpm in order to achieve maximum torque.

The advantages gasoline engines aspects of the operation look like this:

  • the sound of the Engine is quiet compared to a diesel engine;
  • reliability of the fuel supply system, acceptable repair cost;
  • the unit calmly tolerates a long increase in crankshaft speed up to 5000 rpm on atmospheric versions and 8000 rpm on turbocharged ones;
  • no cold start problem;
  • the exhaust contains fewer harmful substances and soot.

Note. Diesel differs from gasoline in a high content of sulfur, paraffin and lead compounds. Therefore, the combustion of diesel fuel releases much more harmful substances into the environment than the combustion of light hydrocarbons.

An additional advantage of gasoline Engines is versatility. If you equip the car with an additional installation and a separate fuel tank, you can drive on liquefied gas (propane-butane mixture) and even on methane. Modernization saves money since gas is significantly cheaper than liquid fuel

disadvantages of gasoline engines:

  1. The gasoline engine weakly “pulls” at low revs, there is not enough torque. Powerful “pickup” starts from 3000 rpm of the crankshaft.
  2. High fuel consumption, including liquefied gas.
  3. The presence of an ignition system, whose elements often fail due to wear or water ingress.

The pros and cons inherent in gasoline engines give them advantages for installation in cars and sports cars. Where decent power, comfort, and speed are needed, these engine are indispensable.

advantages and disadvantages of diesel engine

The main plus of the Engine is a powerful traction force in the entire range of crankshaft speeds. Since diesel fuel is ignited by high compression and burns inside the small volume of the chamber, the expanding gases push the piston much harder regardless of the speed. Therefore, the engine “pulls” well even at idle.

advantages of diesel engines:

  • higher efficiency of fuel combustion;
  • efficiency up to 20% in comparison with gasoline “brothers”;
  • due to the absence of an ignition system, the reliability of operation is increased;
  • for the same reason, the car is able to overcome deep fords without fear of water getting on the candles;
  • diesel fuel is cheaper than gasoline.

Diesel engines are installed in all commercial and commercial vehicles. They are also indispensable on real off-road vehicles operated in difficult conditions

In Western Europe, diesel engines have become very popular due to their efficiency. Manufacturers began to equip cars of all classes with similar engines, including small cars. The introduction of new technical solutions made it possible to get rid of the characteristic “tractor” sound inherent in old foreign cars, although the Engine still loses to a gasoline engine in terms of the noise level.

disadvantages of diesel engines:

  • the unit cannot be constantly operated at high speeds;
  • sensitivity to low-quality diesel fuel;
  • noise at work;
  • expensive repair of injectors and high-pressure fuel pumps;
  • difficult start-up during severe frosts;
  • a large amount of harmful emissions.

Note. In order to increase environmental friendliness, a special particulate filter is placed on the exhaust tract of modern cars. One problem the “strangled” engine loses some power.

A new diesel made after 2000 is really quiet. But as the timing parts, valves and cylinder-piston group wear out, the sound intensifies, a familiar rattling appears. And in order not to lose power, drivers of the countries of the former USSR often throw away particulate filters.

which is better gas or diesel engine?

which is better gas or diesel engine?

There is no single answer to this question, much depends on the scope of the car. A comparison of the petrol and diesel versions shows that the latter is more economical in the short term. That is, during operation, fuel costs are significantly lower, but when the issue of repairing high-pressure fuel pumps or injectors becomes an edge, you will have to immediately pay a tidy sum.

When to choose a diesel engine:

  • if you profess a calm driving style and prefer daily cost savings;
  • for the transportation of goods, including over long distances;
  • when you pick up a frame SUV for driving on difficult routes and unpaved surfaces;
  • you just love how the engine pulls at low rpm.

If none of the above items suits you, feel free to buy a car with a gasoline version of the Engine. With this engine, you can also save money – add a gas installation or drive quieter, without sharp dynamic accelerations.

The operational life of a diesel and gasoline engine is approximately the same, as is the cost of repairs. But the first one is more afraid of the water hammer: it is worth literally a drop of water to enter the combustion chamber (for example, through an air filter), and a crack in the cylinder head is guaranteed. In the gasoline version, the compression ratio is lower and the chamber is larger, so the likelihood of damage from water ingress is much lower.

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