[Diy_efi] Ion Sensing project-

Fri Jul 5 17:13:25 GMT 2002

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After Ignition, assuming constant current, wouldn't the voltage be 
proportional to the no. of ions in the gap? Does combustion blow-out the arc? 
The spark voltage waveforms I've seen have a fast rise to the arc voltage 
followed by a jagged, distorted, stepped, exponential fall. It may too hard 
to interpret. Oh well, just an idea. 

Yes, the first arc voltage is pressure sensitive, if that helps.

How about a "strain gauge head-bolt washer" to directly measure cyl pressure?

Jim

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<HTML>After Ignition, assuming constant current, wouldn't the voltage be proportional to the no. of ions in the gap? Does combustion blow-out the arc? The spark voltage waveforms I've seen have a fast rise to the arc voltage followed by a jagged, distorted, stepped, exponential fall. It may too hard to interpret. Oh well, just an idea. 
 
Yes, the first arc voltage is pressure sensitive, if that helps. 
 
How about a "strain gauge head-bolt washer" to directly measure cyl pressure? 
 
Jim</HTML>

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