Sale ends todayGet 30% off any course (excluding packages)

Ends in --- --- ---

Knock Frenquency

Webinar Questions

Forum Posts



Tech Articles

Ask questions about webinar lessons here. To see the Previous Webinars for a complete list of archives tuning webinars. 

= Resolved threads


Hi Fellows,

I just watched a webinar on seting up the Knock detection strategy (on Motec M1 i think).

I understood that the first thing to do is to find the frequency signature of your particular engine (ie the frequency at witch there is the biggest knock activity amplitude in order to easily detect knock)

My question is : Is that frenquecy totally independant on RPM and Load ? I understood it's mainly relative to the piston bore diameter, but does it varies with load and engine speed ??

Thanks in advance !



The frequency is independent of load and RPM, but the amplitude of the signal is not. That's why the thresholds for knock varies with RPM.

The frequency is dependent on the bore diameter. However the strength of the "normal" (without knock) noise in the engine rises with engine load. if you use audio knock equipment you can train your ears in recognizing knock from other noise.

if you're first starting out with audio equipment try to start without to much frequency filtering.

We usually reply within 12hrs (often sooner)

Need Help?

Need help choosing a course?

Experiencing website difficulties?

Or need to contact us for any other reason?