WB Instruments

[Barry Tisdale]

Observations on experiments connected with building a couple of DIY-WB
boards (and finally going w/ a commercial one...):

Sensor *is* sensitive to hydrocarbons.  Argon alone, or C2 MIG (Ar 75%, CO2
25%) mix gives you stoich readings.  Stuff out of the bottle is practically
anhydrous, so not sure what water vapor (bubbling) in it would do.  Adding
just a dab of propane (2cc in a quart of argon) will cause the sensor to go
quite rich.  I run the sensor(s) in a 1 qt Mason jar - convection from the
hot sensor mixes things well; the muffin fan I had in the jar originally
isn't needed.  'Free air' cal is so far out of the normal operating range
of the WB, I didn't find it of much value.  Have run a WB and NB side by
side - dramatic differences in 'switching' curves.

I bought the Honda sensor from thepartsbin w/o any problem whatsoever -
$117 + a few bux shipping.  Price is still good AFAIK.  Sensors thru NAPA
are "Factory backordered", out of stock in all US warehouses.

Running the sensor in an engine w/o any heater current is a no-no according
to FJO; apparently crud will accumulate rapidly & screw it up.  Might want
to try the 'propane torch fix' that seems to work w/ NB sensors - might
burn off the gook & if its shot anyhow, what's to lose?

All of the above is strictly what I've observed - YMMV, etc.

Barry
----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org