Mr Whippy
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| posted on 9/10/08 at 08:51 AM |
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Where is the ideal location of a Lambda sensor?
I’m fitting a LPG conversion kit to my 20 year old Bluebird, and it’s a closed loop setup utilizing a lambda sensor to control the gas mixture. The
car has a carb so I need to weld in the new sensor, just not quite sure where it will work best, I suppose that it should be on the outside of the
curved down pipe as would the gas stream not be most concentrated there? But how far from the exhaust, does it matter?
should soon be seeing fuel costs equivalent to about 80mpg! 
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Paul TigerB6
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| posted on 9/10/08 at 08:57 AM |
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On my tintop its just a few inches down from the exhaust manifold on the downpipe before the catalytic converter. Exhaust gas is hotter the closer you
are to the manifold isnt it.
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Mr Whippy
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| posted on 9/10/08 at 09:05 AM |
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Yeah but I've seen quite a variation of distances. Given that it’s not a performance car I'd expect it could be quite close, just not sure
if there is an optimum temperature for it to work?
[Edited on 9/10/08 by Mr Whippy]
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flak monkey
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| posted on 9/10/08 at 09:47 AM |
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The closer the better with an unheated lamda sensor.
Doesnt matter too much with a heated one.
David
Sera
http://www.motosera.com
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Mr Whippy
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| posted on 9/10/08 at 10:14 AM |
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hmm cheers, apparently - "The sensors only work effectively when heated to approximately 800°C"
Oh well so much for my worries of melting it! 
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MikeRJ
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| posted on 9/10/08 at 01:36 PM |
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The sensor should also be mounted pointing somewhat downwards (i.e. the sensing end pointing down) rather than horizontal or upwards to prevent water
getting trapped inside it.
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Mr Whippy
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| posted on 9/10/08 at 02:23 PM |
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quote:
Originally posted by MikeRJ
The sensor should also be mounted pointing somewhat downwards (i.e. the sensing end pointing down) rather than horizontal or upwards to prevent water
getting trapped inside it.
oh right, never thought of that but surely it would be quite dry normally seeing where it lives?
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MikeRJ
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| posted on 9/10/08 at 03:32 PM |
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quote:
Originally posted by Mr Whippy
[oh right, never thought of that but surely it would be quite dry normally seeing where it lives?
Exhaust gas contains a large percentage of water vapour which can condense when things cool down...
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Mr Whippy
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| posted on 9/10/08 at 08:23 PM |
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certainly would never have considered that, thanks
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