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Describe the working of a four stroke petrol engine

      

Describe the working of a four stroke petrol engine

  

Answers


john
Working of four stroke cycle in petrol engine.
(i) Induction stroke
- Piston moves downwards creating a partial vacuum on the upper part of the cylinder.

-The partial vacuum causes the inlet valve to open.

- The open inlet valve sucks in fuel and air into the cylinder.

- The exhaust valve remains closed.

(ii) Compression stroke
- The inlet and exhaust valve are closed.

- The piston moves up the cylinder.

-The air fuel mixture is compressed in the upper part of the cylinder.

(iii) Power stroke
-The piston reaches the upper most portion of the cylinder.

- At this point the air fuel mixture is fully compressed.

- The spark plug produces a spark igniting the fuel air mixture.

- The ignited mixture expands, generating pressure that forces the piston downwards thus generating power.

- The inlet and outlet valve remain closed.

(iv) Exhaust stroke

- The exhaust valve opens the inlet valve remains closed.

- The piston moves up the cylinder or forces out the exhaust gases.
john3 answered the question on December 15, 2017 at 14:38


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