answersLogoWhite

0

'Knocking' in petrol engines is caused by petrols low flashpoint - its high combustibility.

The octane rating is too low for the compression.

User Avatar

Wiki User

14y ago

What else can I help you with?

Related Questions

What will happen when petrol is poured into a diesel engine?

The engine will knock.


How engine knocking can be reduced?

Lead dust added to the intake charge will also reduce knock with various hydrocarbon fuels. Manganese compounds are also used to reduce knock with petrol


Where is the knock sensor located on a 2.2 petrol vauxhall frontera?

On a 2.2 petrol Vauxhall Frontera, the knock sensor is typically located on the engine block, near the cylinder head. It is usually positioned on the side of the engine, often towards the rear, and may be mounted directly onto the engine or near the intake manifold. To access it, you may need to remove some components or covers, depending on the specific configuration of the engine.


Why is there lead in petrol?

Lead was added to petrol as an anti-knock agent to improve engine performance. It prevented engine knocking or pinging, which is a metallic pinging noise that can occur in an engine when fuel ignites unevenly. Lead was phased out of petrol due to its harmful effects on human health and the environment.


What is anti knock property?

The anti-knock property refers to a fuel's ability to resist premature ignition or knocking during combustion in an internal combustion engine. It is typically measured using the octane rating; higher octane fuels can withstand greater pressure and temperature before igniting. This property is crucial for maintaining engine performance and efficiency, as knocking can lead to engine damage and reduced power output. Fuels with good anti-knock characteristics promote smoother operation and prolong engine life.


Does the engine on a 2003 impala knock in the top of the motor if the knock sensor is bad?

The knock sensor just advances and retards the engine timing only. If there is a noise in the engine then you have engine are valve train problems. The knock sensor will not make the engine knock.


How does a modern engine management with a knock control system react to engine knock?

This is controlled by a knock sensor.


Why does your engine knock?

I have a recent engine knock on my 91 escort started out intermittant. I have a recent engine knock on my 91 escort started out intermittant.


What is the function of lead in petrol?

Lead is no longer added to petrol because it added to both air pollution and general health risks. It used to be added for help in maintaining the general "health" of an engine's valves as well as reducing engine knocking.


What is unleaded petrol made up of?

unleaded petrol is 91 octane petrol with not a trace of anti knock compound(tetra ethyl lead)...so that it produces no harmful emissions


Why is your engine knocking on BMW745?

knocking as in spark knock? or engine knock? spark knock is adjusted through a knock sensor via ignition timing. eng. knock is due to brg. knock as in low oil pressure or sluge in engine or just a tired motor


Does the engine knock with a bad knock sensor?

NO it will not. If you have a knocking sound then you have trouble inside of the engine.