Knock Question

[rbraun at mail.enter.net]

I believe it was in Design News Magazine I saw an article on spark 
plugs with fiber optic probes in them, it was like 8 of them around 
the circumference of the outer shell, with the proper instruments you 
can watch flame shape and travel.  All this without any extra windows 
or ports into the chamber which may alter the burn characteristics.
  I don't save the back issues so I can't find it for you, but a good 
tech library may have them.

If this helps, it may be expensive.

> 
> Now my engine builder is a little reluctant to cut a hole through the
> cooling jacket and put a quartz window in for an optical detector, and I am
> rather reluctant to undertake a total redesign of my electronic ignition
> system.  Which leaves sticking a probe into the exhaust and measuring the
> amount of ionization.
> 
Randy Braun     rbraun at enter.net
91  GTA
82 Firebird