REFLECTOR: Franklin Oil temp and flow data

[Laurence Coen]

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 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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