REFLECTOR: Running LOP

Bernard Despins bdespins at telusplanet.net
Thu Jan 4 11:03:12 CST 2007


As far as I can remember, the basic system is around $4500 including 3 
tapped plugs and one sensor.

michalk wrote:
> How much do they want for that THX system?
> How much to upgrade a spark plug?
>
> Bernard Despins wrote:
>   
>> The THX system can be implemented using instrumented spark plugs (like 
>> the PRISM system) instead of drilling and tapping a new hole.  You send 
>> the plug you want to instrument (automotive style in my case)  to a 
>> company which uses electrical discharge machining to bore a hole in the 
>> right place and then install the pressure probe. 
>>
>> I've looked into the ionic sensing concept, but could not find enough 
>> information.  The biggest problem that I could find, was that the signal 
>> being monitored is very small compared to the large voltage spikes 
>> occurring in neighboring plugs.  All commercial pressure monitors I 
>> could find used a system of fiber optics to measure the movement of a 
>> tiny diaphragm .  This decoupled the noise.  I'm sure ionic sensing is 
>> coming though...
>>
>> Bernard
>>
>> Brian Michalk wrote:
>>
>>     
>>> I'm all over pressure sensing.  I looked at your link.  It looks like 
>>> you need to drill and tap a new hole.
>>>
>>> Have you thought about ionic pressure sensing?  I'm going to build one 
>>> for myself one of these days after I'm flying.
>>>
>>> GAMI says they can run avgas with diesel contamination and with PP 
>>> sensing, the engine runs without detonation.
>>>
>>> This would solve the lead problem, but I think Volvo or SAAB has a 
>>> patent on the ionic sensing thing.
>>>
>>>  
>>>       
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