Note: Refer HERE for a detailed explanation of Knock Control settings.

Note: Knock Control is not available on the G4X Atom or Monsoon before version 3.0 due to hardware differences.

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Knock Control is a feature designed for reducing engine damage caused by detonation, detonation occurs due to excessive cylinder pressure usually caused by the ignition event happening too early (too much advance) but other factors can cause detonation such as excessive engine temperatures, low octane fuels and lean mixtures. Excessive engine temperatures, low octane fuels and lean mixtures can cause Pre-Ignition which is when the air fuel mixture ignites before the spark event occurs and this can lead to knock, in this case adding fuel to help cool the cylinder and richen the mixture can help prevent pre-ignition and as a follow on from that help prevent knock.

 

Detonation can cause irreparable damage to an engine, including burnt pistons and broken ring lands, in almost all cases detonation can be avoided by reducing the amount of ignition advance, adding fuel or a combination of the two, for a given load. The Knock Control function allows the ECU to detect detonation and automatically reduce ignition advance and add fuel until detonation no longer occurs.

 

Many Link G4X ECUs are capable of Internal Knock Control.

 

Note: The Knock Control function and knock windowing only operate above 500 RPM.

 

 

Knock System Runtime Values

To help with setting up and monitoring the knock system the Knock Runtimes can be viewed under the Knock tab of the Runtime Values window (F12 key)