What is the most common cause of detonation in an engine?

Detonation is generally caused by excessive heat, excessive cylinder pressure, improper ignition timing, inadequate fuel octane or a combination of these. Of the previous, excessive heat is usually the culprit. As an engine is modified to generate more power, additional heat is produced.

Which of the following factors contribute towards detonation in an engine?

Knocking or detonation is due to the auto-ignition of the end portion of the unburned charge in the combustion chamber. Cause of detonation: Compression ratio: Increasing the compression ratio increases both the temperature and pressure.

Which of the following factors will increase the tendency of engine to knock?

Compression ratio:- Higher compression ratio will result in the higher temperature of the charge, the tendency to knock will increase. Inlet air temperature:- The effect of inlet air temp is the same as the compression ratio. The high inlet temp of the air-fuel mixture will increase knocking.

What is detonation mention the factors which cause detonation?

The following are the certain factors which causes detonation. (1) The shape of the combustion chamber. (2) The relative position of the sparking plugs in case of petrol engines. (3) The chemical nature of the fuel.

What factors reduce the occurrence of detonation in petrol engine?

Detonation can be prevented by any or all of the following techniques:

• retarding ignition timing.
• the use of a fuel with high octane rating, which increases the combustion temperature of the fuel and reduces the proclivity to detonate.

What causes detonation in a two stroke engine?

Detonation, unlike a normal engine combustion process, is a condition where the fuel and air inside of the combustion chamber spontaneously combusts or “explodes” rather than burning at a very specific c rate. This spontaneous combustion occurs as a result of having a combination of excessive heat and pressure.

Which of the following factors decrease the detonation in SI engine?

Explanation: In SI engine, due to the increment of the initial temperature and pressure are ignition lag is reduced.

What are the major factors involved in preventing knock in SI engines?

From the above discussion on knock, it may be seen that four major factors are involved in either producing or preventing knock. These are the temperature, pressure, density of the unburned charge and the time factors.

What is the effect of detonation occurs in diesel engine?

When detonation happens, some of the air/fuel ignites before the normal burn can get to it. This causes a brief, but intense, spike in cylinder pressure. Detonation is also called an “Engine Knock”, “Knocking”, or “Pinging” because of the sound it makes.

How do you prevent engine detonation?

Detonation Elimination: 9 Ways to Prevent Engine Detonation

1. #1. Up Your Octane.
2. #2. Keep Compression Reasonable.
3. #3. Check Your Timing.
4. #4. Manage Your Boost.
5. #5. Monitor the Mixture.
6. #6. Blow out the Carbon.
7. #7. Examine Your Knock Sensor.
8. #8. Read Your Spark Plugs.

What causes detonation in a diesel engine?

Detonation is spontaneous combustion inside the cylinder AFTER the spark plug fires. The flame travels across the combustion chamber igniting the Air/Fuel Mixture. This causes a steady increase in cylinder pressure and forces the piston down on the Power Stroke.