Knock sensor

sdbartho at sdbartho at
Thu Jul 21 15:22:35 GMT 1994

>Just interested in other's ideas how this might actually work.  How could 
>plug gap resistance after the spark tell you anything about detonation?  Can 
>the plug gap "taste" the residue of preignition as being different from the 
>"taste" (er..resistance) of a slowly propagting flame front that results 
>from correct ignition?

Kenne-Bell is marketing an ignition controller for Syclones/Typhoons that
can supposedly detect detonation in each cylinder and retards timing only
in that cylinder. Since they don't use a knock sensor for each cyl., this
must be how they determine whether or not a cylinder is detonating.

Could it be that they are considering unusually high cylinder pressure to
be equal to detonation? The resistance of the gap would go up, the current
would drop- there's your detection. Sounds a lot like a Jacobs ignition.

sdbartho at

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