What is the detonation and knocking in cars?

Detonation knock is a knocking noise that you'll hear when the air fuel mixture in the cylinders is detonating in more than once place at a time. Parts of the air/fuel mixture can start to ignite too early. When these mini fireballs collide, they create a knocking noise.

1. What is knocking and detonation in engine?
2. What causes detonation knock?
3. What does a knocking noise mean in a car?
4. What happens when there is detonation in your car?
5. Is detonation and knocking same?
6. Can you drive a car with a knocking engine?
7. When I drive I hear a knocking noise?
8. Can a bad coil pack cause knocking?
9. What is pre detonation in a car?
10. What does car detonation sound like?
11. What are the differences between detonation knocking and preignition?
12. What is the difference between knocking or detonation in SI and CI engine?
13. What are the effects of knocking?

What is knocking and detonation in engine?

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 causes detonation knock?

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.

What does a knocking noise mean in a car?

The knocking sound often occurs when the air-fuel mixture is incorrect, which causes the fuel to burn in uneven pockets rather than uniform bursts. Left untreated, it can cause damage to the piston and cylinder wall. A knocking sound can also be caused by a lack of lubrication in the upper cylinder head area.

What happens when there is detonation in your car?

Unlike normal exhaust noise, detonation is a higher-pitched, raspy note that emanates from the engine compartment. When detonation occurs, serious internal damage may happen, including melted spark plug electrodes, cracked piston rings, melted or cracked pistons, hammered rod bearings, and blown head gaskets.

Is detonation and knocking same?

Knocking vs Detonation

Knocking is the making sharp sounds due to uneven combustion of fuel in the cylinder of a vehicle engine. Detonation is the process of pre-ignition or auto-ignition of a fuel in an engine's combustion chamber.

Can you drive a car with a knocking engine?

Yes you can - but not very far! An engine knock is an expensive noise and the sooner you stop it the less it may cost. Allowed to run without oil or with no oil pressure an engine will fail catastrophically. Equally damaging would be lack of engine coolant which will also make that light come on.

When I drive I hear a knocking noise?

A bad serpentine belt could be a culprit of knocking noises. ... When the belt stretches or goes bad, you'll hear a rattling noise as you're driving. To fix this issue, take it to a mechanic. Capitol Toyota shares the fix: the belt or the pulleys connected to it need to be replaced or adjusted.

Can a bad coil pack cause knocking?

Coil packs have absolutely no moving parts inside them. The only noise they can make is a (usually faint) ticking noise, if the arc is shorting through air straight to ground.

What is pre detonation in a car?

Pre-ignition (or preignition) in a spark-ignition engine is a technically different phenomenon from engine knocking, and describes the event wherein the air/fuel mixture in the cylinder ignites before the spark plug fires.

What does car detonation sound 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 are the differences between detonation knocking and preignition?

Detonation is an uncontrolled combustion event which occurs after the spark event. Pre-ignition is an uncontrolled combustion event which occurs before the spark event. Knock (pinging) is the actual noise that can be audibly heard if detonation is bad enough.

What is the difference between knocking or detonation in SI and CI engine?

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. ... The air fuel mixture that self ignites in SI engines is homogeneous.

What are the effects of knocking?

Explanation: The effects of knocking are. i) noise and roughness. ii) mechanical damage. iii) carbon deposits. iv) increase in heat transfer.