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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>
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