Introduction To Automobile Engine
It’s has been an ever-growing debate over Engines. Undoubtedly auto makers are trying there level best to provide there vehicles with wide variety of engines. Also the buyers are all concerned about “which one is good for them ?” Both petrol engine and diesel engine have there specific pros and cons. Make sure you read this blog to know them all.
Technically these are also labelled as Spark Ignition (SI) Engine and Compression Ignition (CI) Engine. Their working, Efficiency and much more points are thoroughly discussed here. This blog will help you to differentiate the engine and make the right choice. So let us get started.
Also Read : Engine Nomenclature Explained | Labeling An Engine
1. Working Principle
Beginning with its working principle. It is the most fundamental differentiation among them. As the name suggests Spark Ignition engine uses a spark plug for the combustion of the fuel. Notably, SI engine works on Otto Cycle. In petrol engine the air-fuel mixture is introduced into the cylinder during the intake stroke. The piston compresses the fuel-air mixture. Further the spark ignites it, causing combustion.
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On the contrary, Compression Ignition (CI) engine uses hot air to ignite rather than Spark plug. CI engine are based on Diesel cycle which is consequently named after Rudolf Diesel. The fuel is injected at the end of the compression stroke and is ignited by the high temperature resulting from the compression.
Also Read : First Diesel Engine : Unfolding it’s History | Autobizz.in
2. Power
First thing first, a petrol engine will produce more power for same compression ratio. Although diesel engines produce more torque, the the engine speed is more dominant than torque. That is petrol engine have higher RPM as compared to their diesel counterparts. The higher speeds of petrol engines are mainly based on ignition technique. Other minor reason can be Petrol has higher calorific value (in simple : the heating value) than diesel fuel.
3. Torque
The torque is determines as the rotational force of the car. Torque equals force multiplied by distance. The more torque a car can produce the more load it can carry without losing performance. Thus it makes such vehicle idle choice for heavy loads.
In this case diesel engine produce more torque. Diesel engine have longer stroke length. As the piston can move to longer distance thus creating more force or pressure. The more the pressure is built in the cylinders the more torque the wheels get. In addition the diesel engine compresses air to combust the fuel. With higher compression rate the fuel burns faster thus adding to torque levels.
Read More: Top 10 Most Powerful Production Cars of The Last Decade
4. Efficiency
Diesel Engine are more effective compared to petrol engine. This is because of two reasons, firstly because of high compression ratio and secondly they are unthrottled. Infact, diesel engine also emits fewer greenhouse gases. In petrol engine due to low compression ratio the thermal efficiency that can be obtained is less.
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5. Final verdict
Although the final decision lies with you, we at Autobizz help you to get things sorted. Below we have summarised the Different advantages and disadvantages of these engines. Have a look.
| Sr. No. | Petrol Engine | Diesel Engine |
|---|---|---|
| 1. | Petrol Engine are more powerful | It is versatile in stop & go traffic |
| 2. | Petrol Engine are more responsive | Diesel engine is fun to drive |
| 3. | Major Auto Brands provide well refined petrol engine | Diesel powered cars are more efficient |
| 4. | Petrol engine cars are cheaper | Diesel fuel is cheaper than Petrol |
| 5. | With BS6 Petrol engine are less harmful for the environment (compartively) | Diesel engine emit fewer greenhouse gases |
| 6. | Petrol Engines are less noisy | Diesel engine produce more torque |
| 7. | In case, Petrol Can Be Easily Converted Into CNG | Diesel engines are best for hauling heavy loads |
| 8. | Petrol Engines Are Cheaper To Repair | Diesel is more reliable in the long run |
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