Question

Draw a sketch of petrol engine and label the parts:

Answer 1

Let us see in brief how a petrol engine works-
A fixed cylinder and a rotating piston are part of the engine. The piston, which in turn rotates the crankshaft, is pressed by expanding combustion gases. The spark ignites the fuel-air mixture after the piston compresses it, causing combustion. In the power stroke, the expansion of the combustion gases drives the piston.

Complete step by step answer:

PISTON- The part of the internal combustion engine is the piston. The key role of the piston is to convert; acting on the crankshaft, the pressure produced by the burning air-fuel mixture into power.
PISTON ROD- The part of a piston engine which connects the piston to the crankshaft is a connecting rod. The connecting rod, along with the crank, transforms the piston’s reciprocating motion into the crankshaft’s movement.
CRANKSHAFT- A moving portion of the combustion engine is the crankshaft. The key purpose is to turn the piston’s linear motion into rotational movement.
INLET VALVE- In opening the inlet valve is given a lead before the piston hits the top dead centre on the exhaust stroke so that when the piston continues its induction stroke, less resistance is provided to the incoming flow of air and fuel mixture.
OUTLET VALVE- The outlet valve rests on the head of a combustion chamber cylinder. In the cylinder head, the engine coolant solvent runs throughout the cylinder lining and the water pathways. In order to let the exhaust gases exit the combustion chamber, the valve pops up and down.
SPARK PLUG- Spark plugs are used to ignite the air fuel mixture in petrol engines, while the use of spark plugs is not expected in diesel engines.

Note:
Fuel and air are pre-mixed before compression in most petrol engines. Petrol engines tend to run faster and efficiently than diesel engines. the exhaust gases exit the combustion chamber, the valve pops up and down.