You asked: Why do petrol engines need a spark plug?

Spark plugs are used in the petrol engines to ignite the air fuel mixture whereas in diesel engines the presence of spark plugs is not necessary. … This proves that in petrol engines the compression alone doesn’t makes the fuel to burn.

Why do diesel engines not need spark plugs?

The higher the ratio, the more air is compressed, and more of the injected fuel is ignited during combustion. The result is a more powerful explosion and better performance. While compression ignition means that diesels don’t require spark plugs, they can come fitted with components called glow plugs.

Why spark plug is not used in CI?

Spark plugs are used in the petrol engines to ignite the air fuel mixture whereas in diesel engines the presence of spark plugs is not necessary. … Normally the compression ratio of SI engines will in the range 6 – 8 . This proves that in petrol engines the compression alone doesn’t makes the fuel to burn.

What is the difference between a 4 stroke spark plug and a 2 stroke spark plug?

The differences between two-stroke and four-stroke engines

The first difference is the fact that the spark plugs fire once every revolution in a two-stroke engine, while firing is once every other revolution in a four-stroke engine. … A four-stroke engine has a separate compartment for the oil and doesn’t require mixing.

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What if petrol is used in diesel engine?

Putting petrol in a diesel car can cause serious damage to the fuel injection system and engine. … When petrol is added to diesel it reduces its lubrication properties, which can damage the fuel pump through metal-to-metal contact and create metal particles causing significant damage to the rest of the fuel system.

Can I drive with a faulty spark plug?

Continuing to drive with worn out or damaged spark plugs can ultimately cause engine damage, so don’t put it off.

How do I know if my spark plugs need changing?

8 Signs the Spark Plugs or Spark Plug Wires Need Replacing:

  1. Regular Maintenance. Check the owner’s manual for the replacement interval. …
  2. Spark Plug Wires. …
  3. Fuel Economy Degradation. …
  4. Slower Acceleration. …
  5. Rough Idling. …
  6. Engine Misfires. …
  7. Difficulty Starting. …
  8. Warning Lights.

Which is not used in CI engine?

Explanation: Alcohols have high self-ignition temperature and low latent heat of vaporization. That is why they cannot be used in CI engines. … Explanation: Methanol is not used in CI engines because of its high octane number and low cetane number.

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