Hi Kingsley,
Be a former quant, yes, I love calibration! In situ the probes all read equal
when the engine is cold.
Hi Jos,
It would be very interesting to compare the ring location I have vs the
spark plug site. I was advised by Kerry at Lockwood not to go there
because the relationship between temps there and the "official" site
were not known or at least documented. I am enclosing a pic of the
two probes installed. When using the VDO probes on 2,3 on my old
BMA EFIS, there was usually a 20F delta between front and back. The
shroud should certainly help but it is very expensive. Homebrew anyone?
Hi Paul,
You are correct! The unipolar probes will not work at all. By design of the
engine pod, the voltage across the temp sensitive resistor is not
ground referenced and grounding the bottom of the resistor will
screw the constant current injector driving the probe. Greg and I tried
it anyway to see if it might work, but it was No Go.
I would suspect that Westach probes will not work. Blue Mountain does
not publish the sensor specs or cal curves but they use a UMA oem
sensor element. If you are using a Gen4 unit, you as a user can not
recalibrate to a different sensor. If you are using a previous generation
EFIS, anything can be made to work but you will need to calibrate it.
--------
Ira N224XS
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