Knock sensors

[Alex E]

Does anyone know if it is possible to but a dash mounted knock sensor warning device ? I am sure there was one on the market a few years back but don`t seem to be able to find one now.
As I remember it was a very simple device with an illuminating warning light when it detected any knock.
alex

[Chris Y]

We use one of these:



KnockLink by Link Electrosystems

[Alex E]

Thanks Chris,
I assume this is completeley independant of you engine management system ?
Alex.

[ian_w]

I've used a J&S system a few years ago and it worked very well.

http://www.jandssafeguard.com/

[Chris Y]

Originally Posted by Alex E

Thanks Chris,
I assume this is completeley independant of you engine management system ?
Alex.

Yeah, self contained.

"engine management system" We're using points and condensers

[zefarelly]

I use these.





very sensitive, but they need training and tuning.

proper petrol helps as well

[Al Weyman]

Race exhaust, intake roar while wearing helmet and balaclava not always possible to hear, MSD also do devices a mate of mine fitted one in his Camaro a few years back.

[Notso Swift]

Yeah that^

On my last car if you hear it knock it was already too late- ring land would be cracked, damn turbo's it all happens faster.

Now not a problem, you can hear it coming on and back it off. I guess the alloy block helps the resonance

[Paceracing]

The trouble with knock sensing is knowing the characteristics of what you are looking for. Knock is usually in a narrow frequency band at a particular load site in the engine map. Unless the sensor is capable of sensing across a wide frequency band and the controller is able to pick it out, I wouldn't bother with it. When Bosch conduct knock testing on race engines, they fully instrument the entire engine to characterize knock. It costs thousands to do it properly and I would be suspicious of cheap alternatives claiming to be able to identify knock unless its really obvious.