Knock Box

[MattSR]

I just found this link, Apprently its a knock listening devicethat was developed for the Gibson/Winfield GT-R's back in the Group A days.

http://www.theknockbox.com.au/

Cheers,

Matt

[rob82]

I just found this link, Apprently its a knock listening devicethat was developed for the Gibson/Winfield GT-R's back in the Group A days.

http://www.theknockbox.com.au/

Cheers,

Matt

Looks like a steelman chassis ear except it uses generic knock sensors to pickup noise compared to just a normal piezo electric pickup.

[MattSR]

Its also got a notch filter as well so that you only hear the frequency that knock occurs at (which you can configure) rather than hearing all the other noises as well.

Would be interesting to compare the price of this to a chassisear.

[Sydneykid]

Its also got a notch filter as well so that you only hear the frequency that knock occurs at (which you can configure) rather than hearing all the other noises as well.

Would be interesting to compare the price of this to a chassisear.

I haven't found a frequency filter to be much of an advantage, most of the noise around an engine seems to be in the 5 to 12 KHz range. Which is logical considering the engine is turning at 4,000 to 8,000 rpm when knock becomes relevant for an RB.

cheers

PS; the basic Steelman Chassis Ear is around $100

[MattSR]

That makes sense to me.. All the 1st, 2nd and 3rd order harmonics would fall right in that range.

Cheers,

Matt

PS - I paid a fair bit more than that for my chassisear, though its the 6 channel one. Only bad thing is trying to get my fat hand far enough under the inlet manifold

[N I B]

I find the chassisear with the volume near turned off makes detonation easy to pick, turned up and it tends to get hard to pickup.