knockblock G4+-KNB


G4+ knockblock From Link

The G4+ KnockBlock is an essential tool for tuning and can aid in the early detection of incorrect ignition timing, lean air/fuel mixtures, and mechanical issues. It is used with earbuds, headphones, or noise-canceling ear muffs and features special filtering to allow you to listen in and detect knock early.

  • Listen to one or two knock sensors
  • Special filtering design improves the signal to noise ratio
  • Can be used with ear-buds, headphones or noise-canceling ear muffs
  • Long-life lithium rechargeable battery
  • Rugged CNC aluminum enclosure
  • Flying lead headphones connector
  • Can be used with all OEM knock sensors
  • Can be used to interface directly to a laptop for the recording of engine noise or knock sensor frequency analysis (using PCLink G4+)

Please Note** headphones with their own noise filtering may be unsuitable for use with the knockblock.

What’s in the Box?

  • G4+ KnockBlock
  • 2 sensor looms (attached)
  • 1 headphone loom (attached)
  • Quick Start Guide
  • 1 USB cable mini
  • 2 Bosch type doughnut OEM knock sensors
  • 2 small Link Engine Management stickers


  • Operating
  • Install the knock sensor/s in a suitable location on the engine (typically on a solid mounting point on the block near the cylinder head)
  • If only using one sensor, leave the unused sensor cable disconnected
  • Turn the volume control clockwise until it clicks. The LED indicator will turn blue when the KnockBlock is operating
  • Turn the volume to the minimum setting (most anti-clockwise)
  • Connect headphones to the 3.5mm audio jack
  • Run the engine and carefully increase the volume (clockwise) until engine mechanical noise can be heard. Adjust to a comfortable listening volume
  • Charging
  • Turn off the KnockBlock by turning the volume control anti-clockwise until it clicks
  • Connect the USB charging cable to the KnockBlock’s Mini USB connector. Can be charged from any standard USB charger PC, laptop, car or cell phone charger (2.1A at 5V max)
  • The LED indicator will show red while charging. When the indicator turns off the battery is fully charged
  • Charge the G4+ KnockBlock after use and before storage