REFLECTOR: Oil Pressure

[Scott Derrick]

Engine Management System or Engine Monitor System

John Dibble wrote:
> What is ems?
>
>
> Scott Derrick wrote:
>
>   
>> Where ever you attach the ems to ground attach your sensor grounds there
>> too.
>>
>> John Dibble wrote:
>>     
>>> My sensor is on the bottom of my oil cooler and has a ground wire attached to it.  I
>>> added a second ground wire which passes through the landing light.  Would it help if I
>>> ran the ground wire directly to the battery or to the buss?
>>>
>>> John
>>>
>>> Laurence Coen wrote:
>>>
>>>
>>>       
>>>> John,
>>>>
>>>> Your oil pressure transducer is likely grounded at the engine and your
>>>> readout is grounded to your panel buss.  I suspect the ground potential at
>>>> the panel buss changes with change in load but the same thing doesn't happen
>>>> to the engine ground.  You can check the voltage between the engine and buss
>>>> grounds with varying loads.
>>>>
>>>> Larry Coen
>>>> N136LC
>>>>
>>>> --------------------------------------------------
>>>> From: "John Dibble" <aminetech at bluefrog.com>
>>>> Sent: Friday, July 31, 2009 9:02 AM
>>>> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
>>>> Subject: REFLECTOR: Oil Pressure
>>>>
>>>>
>>>>         
>>>>> At this point I'm pretty sure I do not have an oil pressure problem.  On
>>>>> the return from
>>>>> OSH, my observant copilot noticed that every time I turned a knob the
>>>>> pressure reading
>>>>> changed.  So I turned off my radio and the pressure went up 6 psi.  Then I
>>>>> turned off the
>>>>> transponder and the pressure went up another 6 psi, making it 51 psig
>>>>> which I am happy
>>>>> with.  I checked the voltage drop across the relay and it is 0.  I checked
>>>>> the voltage
>>>>> drop between my RMI monitor ground and another ground.  I varied from
>>>>> 0-0.02 v as I turned
>>>>> on a few things.  The monitor power voltage decreased from 12.6 by 0.1
>>>>> volt each time I
>>>>> trurned on something.  I figure that's just the battery voltage going down
>>>>> with increased
>>>>> load.  What do I need to be looking at?
>>>>>
>>>>> John
>>>>>
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>>>>>           
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>>>>         
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>
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