how does it work? what brand do you use?

here you go

i was looking at livorsi...lots of choices..alarm, light, hp etc..
going on a 500 efi with whipple.

i bought the livorsi ones fred carries, they hook up to my crane hi6 boxes and retard timing as needed cool set up.

Most use a toroidal piezoceramic sensor the looks for a programmed voltage frequency equating to a cylinder pre-detonation. Now depending on the system you have things very from here. Some aftermarket I have seen just give you a warning light. Now in the automovive world some will just retard all the cylinders at once. The Bosch system in there ECU's will retard just the cylinder that is knocking in 3 degree increments with a max of 15 degrees. If that don’t work it will start to add fuel to the knocking cylinders.

As Mike said, a good knock control system will have individual cylinder fuel and timing control. Check out the J&S Safeguard system if you are looking for a good aftermarket system.

Dave

In a different thread on this same subject J&S advised that there are both narrowly focused (+/- a few KHZ) knock sensors with the value of the sensor frequency determined by the physical size of the engine and wide band knock sensors that depend on the ECU programing to identify what is and what is not a knock from the wide band of engine vibration frequencies the sensor relays to the ECU. The Mercury 496HO PCM555 system is the latter per J&S.

Ratman,

Are you using the Crane HI-6M box? I have the HI-6M boxes and want to add know control system so would appreciate any info you can share on how you are setup.

You may find some info on, www.jandssafeguard.com