Knock sensors

[A70Duster at aol.com]

In a message dated 6/2/99 9:20:46 PM Mountain Daylight Time, 
peter at ntserver.techedge.com.au writes:

<< including a cutaway of their Trionic coil - seems to have a ferrite
 core and turns ratio of about 1:5, but they claim "40,000 at the moment 
 of ignition" - explain that! >>


The voltage from an inductor is 

      v(t) = L di/dt

Also collapsing magnetic fields.  Plus 40 kV is not new to electronic 
ignition systems.