How can we prevent knocking in SI engine?
Table of Contents
- 1 How can we prevent knocking in SI engine?
- 2 How can I overcome knocking?
- 3 What causes knocking in an engine?
- 4 Will thicker oil stop engine knocking?
- 5 What do you mean by knocking in SI engines differentiate between knocking phenomenon in SI and CI engines?
- 6 Which factor in the design of combustion chamber to avoid detonation in SI engine is?
How can we prevent knocking in SI engine?
To prevent knock in SI engine the end gas should have low temperature, pressure and density, a long ignition delay and a non-reactive composition.
How can I overcome knocking?
5 Tips to Protect your Engine from Engine Knocking
- Fill up your tank only from reputable gas stations.
- However often you can afford, use fuel with higher octane ratings or be sure to follow your owner’s manual on recommended minimum octane ratings.
What is knocking in SI engine?
knocking, in an internal-combustion engine, sharp sounds caused by premature combustion of part of the compressed air-fuel mixture in the cylinder. Knocking can cause overheating of the spark-plug points, erosion of the combustion chamber surface, and rough, inefficient operation.
Which factor in the design of combustion chamber to avoid detonation in SI engine is not applicable Mcq?
| Q. | Which factor in the design of combustion chamber to avoid knocking and detonation in SI engine is not applicable |
|---|---|
| B. | exhaust valves away from end gas |
| C. | cooling of exhaust valve |
| D. | small bore |
| Answer» a. long flame travel |
What causes knocking in an engine?
Knocking occurs when fuel burns unevenly in your engine’s cylinders. When cylinders have the correct balance of air and fuel, fuel will burn in small, regulated pockets instead of all at once. Engine knocking happens when fuel burns unevenly and those shocks go off at the wrong time.
Will thicker oil stop engine knocking?
Quiet Rod Knock Noise Rod knock is usually the first signal that the end of your motor, as you know it, is coming. In this case, heavier oil should prolong engine life. Heavier oil is not a cure. It can reduce, or eliminate, the knocking for a time and prolong the life of your engine.
What are the factors affecting knocking in SI engines?
Factors affecting Detonation or Knocking in SI engine:
- Compression ratio: The pressure and temperature at the end of compression increases with increase in compression ratio.
- Supercharging:
- Increasing inlet temperature:
- Increase in load:
- Advancing the spark:
- Flame travel distance:
- Spark plug location:
- Engine size:
How detonation or knocking affects the performance of SI engine?
The usage of hydrogen in compression ignition engine leads to production of knocking or detonation because of its lower ignition energy, wider flammability range, and shorter quenching distance. Knocking combustion causes major engine damage, and also reduces the efficiency.
What do you mean by knocking in SI engines differentiate between knocking phenomenon in SI and CI engines?
In S.I. engines detonation is caused by the auto-ignition of end gas towards the end of combustion whereas knocking in CI engines is due to auto-ignition of the first charge at the start of combustion.
Which factor in the design of combustion chamber to avoid detonation in SI engine is?
In order to avoid or inhibit detonation, a high auto ignition temperature and a long ignition lag are the desirable qualities for SI engine fuel.