Knock Detection

[Chris Howard]

At 01:39 7/11/97 -0500, you wrote:
>On Thu, 6 Nov 1997 sdelanty at sonic.net wrote:
>
>> >Fred, when you refer to "edges", are you referring to the edges of the
>> >combustion chamber that meet the head gasket?  Or, possibly any areas
of the
>> >combustion chamber that might not have a smooth radius but maybe a 90
degree
>> >angle?
>> >
>> >I am interested in port and polishing my heads in the future and would
like
>> >to learn as much about this as possible.
>> 
>>   One place especially to look for is plug threads.
>>   Torque Your favorite brand of plug into the chamber and see if there
>>   are any exposed threads in the head... Remove as necessary.
>
>Huh?  There is no unburned fuel near the spark plug when the knock occurs.
>The plug has already ignited it and the flame front is some distance away.
>

There is if the knock occurs BEFORE the spark fires - preignition.

regards,



Chris Howard
Computer Science
University of New South Wales
email: s2184002 at cse.unsw.edu.au
Web: http://www-personal.usyd.edu.au/~choward - Aussie Touring Car Action

Forced induction - The replacement for displacement.