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Reply to "Air Fuel mixture measuring device"

OK, sort of in order: 

  1. I bought an O2 sensor replacement plug to fit the bung from CB Perf.  I am planning on removing my gauge and sensor from a permanent install to a “bring it over when I need it” install.  One less thing in the cockpit to distract me.  It is pretty handy for finding a leaking manifold gasket, but that doesn’t happen very often.

  2. A circuit is a circuit so from that aspect, and looking at it from a current draw point of view (which is what is coursing through your fuse), having the fuse on the hot (red) side or the ground (black) side should make no difference.  Only convention puts it always on the hot side (although I’ve seen ground-side fuses on some Chinese circuits from time to time).  Physics is Physics.

  3. The device on your hot (red) side is a diode, which is a one-way resistor.  The purpose of that is to prevent damaging the circuit board components in the event of some old guy from the backwoods of North Carolina wiring it up bass-ackwards (+12v to black, ground to red).  Normally, that’s a BIG no-no but that diode would save your bacon by acting like a resistor in one direction only and blocking the bass-ackwards current from frying the gauge circuit board till you figure out why the hell it isn’t working at all and wire it up right.
  4. Somewhat unrelated, but is there a dedicated 12v line running to the O2 sensor?  You would have a 12v wire, a gauge wire and a ground wire, in that case.   I have a 12v line on my sensor as the sensor has a heater in it to bring it up to operating temp quicker.   Just curious, Carlos.
  5. I also think that if you sample exiting gasses from one  Or two cylinders you should be all set.  Sampling 2 cylinders is better than one (it smooths the data a little), but two at a time should be fine for tuning your carbs.  You can always point to the exhaust when hob-nobbing with a Porsche purist and tell him/her that you have a Custom, “double-bunger” exhaust (say that with a fake German accent, like a “Doppelpfropfen” exhaust.   Guaranteed, he will agree and look at it with enhanced respect, as purists often do.
  6. Yup.  Shrink wrap the extra wires and insulate them from everything.  Always a good practice.
Last edited by Gordon Nichols
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