Engine knock can be caused by an incorrect air/fuel mixture within one or more cylinders. The knocking sound is the fuel burning unevenly and creating shock waves at the wrong times. The waves can damage the cylinder wall as well as the piston.Continue Reading
Some vehicles require fuel with octane ratings higher than the normal 87. When a lower-grade fuel is used, engine knocking may be the result. Octane booster can be added to make up for low octane fuel, but it is better to use the higher-octane fuel. Using fuel with a higher rating than recommended by the manufacturer does not have any adverse effects.
Another reason for engine knock may be carbon deposits on the cylinder walls. All fuels for sale in the United States must have levels of detergent to clean out carbon. However, sometimes this is not enough to halt the formation of deposits. The deposits cause compression in the cylinder to increase, while decreasing its volume. Adding a secondary detergent may help alleviate this.
Incorrect spark plugs can also cause engine knock. All manufacturers recommend certain spark plugs for their vehicles, with some listed alternatives. If changing fuel grade or using additives does not solve engine knock, then the spark plugs may be the culprit.Learn more about Engine
Pinging in an engine is the result of the air and fuel mixture within an engine cylinder igniting incorrectly, explains Cars Direct. This may be caused by using gasoline with an insufficient octane rating, carbon buildup within the cylinder itself or improperly functioning spark plugs.Full Answer >
As the piston in an engine moves down, a mixture of fuel and air gets drawn into the cylinder, which causes compression. This compression is ignited by the spark plugs, causing the exhaust valve to open to allow the burned fuel mixture to be sent to the exhaust system. An internal combustion engine needs a gasoline-to-air mixture of around 14.7 parts air to one part gasoline (by weight) in order to run efficiently.Full Answer >
A car's engine works by creating internal combustion, using a mixture of oxygen and gasoline. Electrical energy is discharged into spark plugs by the distributor and ignition coil to ignite the fuel mixture, which creates an explosive force.Full Answer >
Fixing cracked cylinder heads with liquid glass products containing sodium silicate involves draining the coolant from the engine and then introducing the sealant mixture into the cooling system. After the sealant is in the cooling system, the next step in sealing the cracks is to run the engine at idle for a few minutes several times to heat the sealant and force it into the cracks. Afterwards, the coolant system must be flushed and coolant replaced to complete the repair.Full Answer >