REFLECTOR: Franklin Oil temp and flow data

[John Dibble]

On 3/5/2014 12:35 PM, Laurence Coen wrote:
> John,
>
> Looking at the oil bypass plate the bypass spring plug is on your left 
> and is the side of the oil return from the cooler. There is a 1/8" NPT 
> hole on the outside face of my bypass plate that supplies oil to the 
> fuel pump drive via an external oil line.  Replacing the original fuel 
> pump with the PZL pump eliminated this line.  I used a Weldon vane 
> pump mounted on the original pump drive and still have this oil line 
> installed.  I measure both oil temp and pressure by teeing into where 
> the line connects to the bypass plate.

i have a second pressure sensor connected to this location.  I didn't 
connect a temp sensor as I felt that, being external to the case, it 
would read a lower temp than the oil.  Maybe that is not so?

John
>   I think there some Franklins that don't have this fitting hole in 
> the bypass plate.  This may be why Brian did it his way.  Another good 
> possibility is a pipe plug that is located on the copilot side of the 
> engine case on the prop end.  The upper plug closes the crank main 
> bearing oil galley and is where I have installed an oil pressure 
> switch for the Hobbs. Maybe not the perfect location but you would 
> finally be measuring engine oil temp instead of oil cooler temp.
>
> Larry Coen
> N136LC
> --------------------------------------------------
> From: "John Dibble" <aminetech at bluefrog.com>
> Sent: Saturday, March 01, 2014 11:34 AM
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Subject: Re: REFLECTOR: Franklin Oil temp and flow data
>
>> On 3/1/2014 10:29 AM, Brian Michalk wrote:
>>
>> If you have very little oil flowing through the cooler, then it comes 
>> back very cool, and that is what you see on your panel gauge for oil 
>> temp.  I believe that we should be measuring the temperature of the 
>> oil going into the engine.  I tapped the bypass spring plug, and 
>> inserted my oil temperature probe there.
>>
>> I was wondering if there was a place to measure the oil temp that the 
>> engine is seeing.  Seems like the spring plug location is measuring 
>> the oil temp before the cooler.
>>
>> John
>>>
>>
>>
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