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  #1  
Old 12-30-2017, 06:57 PM
Ralph Ketter's Avatar
Ralph Ketter Ralph Ketter is offline
 
Join Date: May 2005
Location: La Luz, NM
Posts: 49
Default Unknown Black Box - What is it?

I'm helping a friend who purchased an RV8 that has no known electrical documentation. The original builder is deceased. I came across this small black box that has 4 wires and surgical tubing attached. It has no markings on the visible surfaces. I have not yet tried to trace the wiring and where the tubing ends up is not apparent.
If you happen to know what is it let me know.
Thanks in advance.

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La Luz, NM

RV-6 Flying
  #2  
Old 12-30-2017, 07:03 PM
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Mike S Mike S is offline
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Default

I would hazard a guess that it is manifold pressure.
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  #3  
Old 12-30-2017, 07:03 PM
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MAP sensor?
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  #4  
Old 12-30-2017, 07:13 PM
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Ralph Ketter Ralph Ketter is offline
 
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Default

It could be a MAP sending unit. It uses a Van's Manifold Pressure gauge but I don't know what the sender looks like. I think this is a good possibility and will try to confirm it.
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  #5  
Old 12-30-2017, 08:59 PM
NYTOM NYTOM is offline
 
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Location: Raleigh, North Carolina
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I have a switch similar to that in size in my flap control system that prevents deploying them at high speeds. Two wires and a tube tied into my pitot system. Similar but not exactly the same. My MP sensor is much larger than the switch or sensor you show. Tracing that tube should answer your question
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  #6  
Old 12-31-2017, 05:06 PM
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n82rb n82rb is offline
 
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that IS a MAP sensor for the vans manifold pressure gauge.

bob burns
RV-4 N82RB
  #7  
Old 12-31-2017, 06:48 PM
pa38112 pa38112 is offline
 
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I have a Vans MAP gauge, and that is not what my sensor looks like. Mine is the analog gauge.
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  #8  
Old 12-31-2017, 07:33 PM
Bevan Bevan is offline
 
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The answer will be at the end of the tube. I'm thinking manifold pressure.

Bevan
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  #9  
Old 01-01-2018, 11:59 AM
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Airspeed limit switch or MP sensor
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  #10  
Old 01-06-2018, 07:11 AM
Ralph Ketter's Avatar
Ralph Ketter Ralph Ketter is offline
 
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Location: La Luz, NM
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Default Unknown Black Box Solved

I finally got back to the airplane yesterday to verify that the unknown black box is indeed a Van's Manifold Pressure Sending Unit P/N IE VMPSND.
It normally comes as part of the analog gauge MAN PRES 35" W/SENDER Part Number = IE VMP35.

Many Thanks to all of you for helping.
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Ralph Ketter
La Luz, NM

RV-6 Flying
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