The word petrol sound quite popular in terms of the usage in a vehicle. Most people don’t understand how and what it takes for an engine to move via petrol, thus it’s named “Petrol Engine”. This article will be exposing you to everything you need to know about petrol engine, like what is petrol engine, it history, types, working principle, efficiency etc. Previously, some articles was publish on automobile engine. Checkout!
- How automobile engine works
- Types of internal combustion engine
- Conventional and Non-conventional types of automobile chassis
What is a petrol engine?
A petrol engine is a type of internal combustion engine with spark-ignition (spark plug), which uses petrol and similar volatile fuel to run the engine.
Petrol engine which is known as gasoline engine in American English was invented in 1976 in Europe. It was first built in 1876 in Germany by Nikolaus August Otto, though there had been attempts by Etienne Lenoir, Siegfried Marcus, Julius Hock and George Brayton.
The earlier petrol engine is design to pre-mixed fuel and air before compressing, which occurs in the carburetor. However, it is now done by electronically controlled fuel injection. Well, the process differs in a small engine where the cost or complication of electronics does not suit the engine efficiency.
Gasoline engine run at higher rotation speeds than diesels, partially due to their lighter pistons, connecting rods and crankshaft (a design efficiency made possible by lower compression ratios) and due to petrol burning more quickly than diesel.
Because pistons in gasoline engines tend to have much shorter strokes than pistons in diesel engines, typically it takes less time for a piston in a petrol engine to complete its stroke than a piston in a diesel engine. However, the lower compression ratios of petrol engines give them lower efficiency than diesel engines.
Typically, most gasoline engines have approximately 20%(avg.) thermal efficiency, which is nearly half of diesel engines. However some newer engines are reported to be much more efficient (thermal efficiency up to 38%) than previous spark-ignition engines.
The process differs from a diesel engine in the method of mixing the fuel and air, and in using spark plugs to initiate the combustion process. In a diesel engine, only air is compressed, and the fuel is injected into very hot air at the end of the compression stroke, and self-ignites.
Before the widespread of diesel engine, gasoline engine were used on trucks, buses and on some railway locomotives. Finally, Petrol engines may run on the four-stroke cycle or the two-stroke cycle.
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