Difference Between Knocking and Detonation

In general, detonation is the cause and knocking is the after effect. ... Knocking is the result of the rapid combustion of end gas ahead of flame front prior to normal combustion. This cause a sharp rise of pressure inside the cylinder and cause metal pinging sound known as knock.

1. What is knocking and detonation?
2. What is the difference between detonation and preignition?
3. What does detonation mean?
4. What causes detonation?
5. How do you stop engine knocking?
6. What are the effects of knocking?
7. Can running too rich cause knock?
8. How do you know if you have detonation?
9. What detonation sounds like?
10. What does detonation look like on a spark plug?

What is knocking and detonation?

Knocking (also knock, detonation, spark knock, pinging or pinking) in spark ignition internal combustion engines occurs when combustion of some of the air/fuel mixture in the cylinder does not result from propagation of the flame front ignited by the spark plug, but one or more pockets of air/fuel mixture explode ...

What is the difference between detonation and preignition?

"Pre-ignition" is an abnormal combustion event. Pre-ignition is the ignition of the air- fuel charge while the piston is still compressing the charge. ... Detonation - Detonation, as the name suggests, is an explosion of the fuel-air mixture inside the cylinder.

What does detonation mean?

: to explode with sudden violence. transitive verb. 1 : to cause to detonate detonate a bomb — compare deflagrate. 2 : to set off in a burst of activity : spark programs that detonated controversies. Other Words from detonate Synonyms & Antonyms More Example Sentences Learn More about detonate.

What causes detonation?

Detonation, or engine knock, occurs simply when fuel pre-ignites before the piston reaches scheduled spark ignition. ... Detonation is generally caused by excessive heat, excessive cylinder pressure, improper ignition timing, inadequate fuel octane or a combination of these.

How do you stop engine knocking?

Detonation Elimination: 9 Ways to Prevent Engine Detonation

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

What are the effects of knocking?

Knocking combustion causes major engine damage, and also reduces the efficiency. The method uses the measurement and analysis of cylinder pressure signal for various loads. The pressure signal is to be converted into frequency domain that shows the accurate knocking combustion of fuel mixtures.

Can running too rich cause knock?

You will get knock from being too rich, but it isn't false. The fuel is still predetonating, and can still cause damage to engine internals.

How do you know if you have detonation?

Detonation—sometimes called knock or pre-ignition—is a pinging sound that can sometimes be heard during acceleration and throttle tip-in. Unlike normal exhaust noise, detonation is a higher-pitched, raspy note that emanates from the engine compartment.

What detonation sounds like?

detonation is refered to as "popcorn" or "bacon" noise, wich it sounds like frying bacon in the pan. It also can be described as somone taking a small ball peen hammer and tapping it on the side of the block.

What does detonation look like on a spark plug?

With the early signs of detonation, the shock-wave will also rattle rings causing the tiny amounts of oil that now gets by rings, to be fused to the white porcelain as tiny black specks, also fused as specks are soot that was clinging to clearance volume surfaces in the relatively "still-air" of the boundary layer.