Engine knock is an uncontrolled ignition of the air-fuel mixture in the cylinders, resulting in a “mini-explosion”. During normal combustion of fuel, the flame propagation speed is about 30 m/s, but during detonation, it increases significantly and can already reach 2,000 m/s. A knock sensor is used to prevent and control this phenomenon. The sensor is used to prevent knocking by changing the ignition timing and returning the system to controlled combustion. It is used on injection engines.

1. RANGE ROVER EVOQUE (L538)
2. RANGE ROVER EVOQUE SUV (L538)
3. MONDEO III Saloon (B4Y)
4. MONDEO Mk III Saloon (B4Y)
5. MONDEO III (B5Y)
6. MONDEO III Turnier (BWY)
7. MONDEO III Clipper (BWY)
8. FREELANDER 2 (L359)
9. LR2 (L359)
10. LR2 SUV (L359)
11. FOCUS (DAW, DBW)
12. 6 Hatchback (GG)
13. ATENZA Hatchback (GG)
14. 6 Saloon (GG)
15. ATENZA Saloon (GG)
16. 6 Station Wagon (GY)
17. ATENZA Station Wagon (GY)
18. MPV II (LW)
19. MPV Mk II (LW)
20. FOCUS Turnier (DNW)
21. See more in applications

The usage of the knock sensor

Strong vibration is transmitted to the engine during knocking combustion. The sensor is designed so that it picks up these vibrations and converts them into an electrical impulse.

The HOFFER brand Knock Sensor is installed on the engine block housing. It is usually located between the second and third cylinders. This position of the sensor allows you to adjust more accurately the operation of all cylinders. It is also placed in the area of ​​the most possible propagation of detonation.