EFI and leaded gas

[ARTHUR OKUN]

You wrote: 
>
>> From:          robert dingli <r.dingli at ee.mu.oz.au>
>
>> FWIW, I have been using a second hand single wire EGO sensor from a 
>> late '80s Toyota 3SG in my 6 cylinder Jaguar running leaded petrol.
>> The sensor has worked well for over two years and around 40K km
>> connected to a voltmeter LED bargraph for display (but not control).
>> 
>> I beleive the initial effects of lead on the zirconia sensor are to
>> slow the response.  I haven't been able to detect any problems 
visually,
>> but closed loop control is another matter.  The intake event to 
sensor
>
>I believe the zirconia is just the ceramic base for a platinum 
catalyst and 
>the lead "poisons" the catalyst. Now if the lead coats the platinum, 
>masking it or it actually interferes with the catalatic action, I 
>don't know.
>
>I've got a Subaru SVX engine that was used in an aircraft conversion
>and they originally used leaded aviation gas. Killed the sensors in 
short
>order. Expensive too, since the engine takes two of the suckers at $75 
a 
>pop.
>
>
>---
>David Parrish
>New kid on the block
>
some aircraft gasolines have very high lead content