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Pre-ignition (sometimes called knocking or pinking) is when the fuel is ignited before the desired point in the cycle of the engine.
That is not just before tdc on the cycle, because alost every engine begins ignition momentarily before tdc, and as the engine speeds up - even further before.
In essence pre-ignition is an undesired ignition of fuel vapours which has the effect of slowing down the piston as it rises towards top dead centre.
Because it ignites before the proper time, it can damage the piston surface, cause wear in the bearings/gudgeon pin/little end, big end bearings or cause extra wear on the piston skirt or cylinder bore.
The other place pre-ignition can cause damage is on the valve seats/valve head.
Either way the engine has problems. It could be an advance issue (mechanical - distributor or electronic sensor - most modern engines have a pre-ignition sensor), bad fuel blend (too high octane), it could be as a result of a carbon build up in the head/valve area (which can cause a hot spot - a source of ignition for the incoming fuel)
If it's a modern car - get the pinking sensor checking at your local garage, if its an old car with a mechanical distributor - check the timing.
What else can I help you with?
What is the difference between a SI engine and a CI engine?
An SI engine ignites the fuel with a spark (SI = Spark Ignition) whereas the CI engine ignites the fuel with heat generated from compression (CI = compression ignition)
What is a critical compression ratio?
The lowest compression ratio of a compression-ignition engine that allows a specific fuel to be ignited by compression ignition.
When is the resistor bypass used in the ignition circuit?
The resistor bypass in the ignition circuit is used when starting the engine. It bypasses the resistor to provide full battery voltage to the ignition coil, ensuring a strong spark for a quick and reliable engine start. Once the engine is running, the bypass is no longer needed and the resistor is re-engaged to limit the voltage to the ignition coil for normal operation.
What is dtsi engine meant for?
DTS-I means "Digital Twin Spark ignition".....
Which stage occurs just before the ignition in an internal combustion engine?
Compression
Pre ignition in an engine may be detected by?
Pre-ignition in an engine may be detected by engine knocking.
Can a Chevy truck with a 5.7 engine with a tbi cause detonation and pre-ignition?
can a chevy truck with a 350 engine with a tbi cause detonation and pre- ignition?
What causes engine pre ignition in 1997 dodge ram 5.2 engine?
check the timing it may be advanced
Engine still makes noise after turning off?
It is called pre-ignition, find a friendly mechanic.
What happens if low octane in fuel?
The engine may experience spark knock AKA ping or pre-ignition. Excessive pre-ignition can cause damage to engine if allowed to continue.
What is The uncontrolled firing of the fuel air charge in advance of normal spark ignition is known as?
pre-ignition
What is spark ignition engine?
A 'spark ignition ' engine is your regular gasoline engine as opposed to a diesel, which is a 'compression ignition' engine
What happens when you don't run 93 octane in a Lincoln Navigator?
u get pre-ignition nock in the engine and it get worse fuel milage
Glowing hot spots in the combution chamber that ignite the fuel before timed ignition is called?
pre-ignition or inaccuratley, Dieselling. it is , of course a hazard, and could cause a backfire, or even an engine explosion.
What is preignition of fuel?
Pre-ignition of fuel that occurs in a spark-ignition engine is when the air/fuel mixture in the cylinder ignites before the spark plug actually fires. It can be initiated from a hot spot such as in the combustion chamber.
Could ignition cause sudden engine failure?
Ignition is required for an engine to work. Failure of ignition would prevent the engine working.
How does knocking takes place in engine?
Spark knock is the result of pre-ignition. Bearing knock is the result of worn main or connecting rod bearings. Either one can do internal damage to the engine.
