REFLECTOR: Franklin Oil temp and flow data

Sun Nov 10 21:53:27 CST 2013

Actually... No.
I flew for several years without significant oil temp problems.
When they started, I had a similar story to the Maule owner.
I did lots of research on the original Franklin Velocity flyer and R&R'd the spring and washer assembly many times.
It is hard to get concrete info on the correct install of the bypass spring and all.
As you may recall... I bought a couple from you as "backup".
I recently did a major exhaust pipe design overhaul...
reversing the factory Franklin pipes and having the exhaust go directly through the prop.
There is a little oil on the prop after each flight... but the temps are better.
My tail cowl is now way exposed so that air can easily flow out the aft. (not that pretty .. but whatever...)
Although she performs much better... it's not the way it was in the "early" years.
And still... there is this time lag each flight before it appears that oil flows.
I don't have instruments telling me this directly... just observation.
The whole bypass oil plate system seems a conundrum...
Nate

Date: Sun, 10 Nov 2013 21:13:47 -0600
From: michalk at awpi.com
To: reflector at tvbf.org
Subject: Re: REFLECTOR: Franklin Oil temp and flow data

    Has yours always been this way?  I
      found this thread from a Maule owner:

        -------------

        Update! I pulled the bypass plate off and tore it apart. I found
        that the plunger on the relief side is scarred and would not
        freely fall out on its own without a little persuasion. Also
        there is a washer located between the end cap and the spring. Am
        I thinking right that a washer in this position would give more
        pressure?? Should I remove the washer and check pressures? Now I
        am in need of some parts mainly a new gasket. I believe I can
        clean the plunger up with a piece of Emory cloth. It's not too
        bad. Any advice on anything would greatly be appreciated. Not to
        many maule gurus let alone franklin guys in my neck of the
        woods.

      -------------

      I have taken mine apart, years ago to reverse engineer it.  I
      don't recall any sticking parts.

      On 11/10/2013 08:37 PM, Nate Jackson wrote:

      Hi Brian,

        My Franklin seems to behaving the same way... after 250 plus
        hours.

        The spring thing doesn't appear to be working.

        it's very common for my oil temp to settle down after 5-15
        miuntes depending on the flight.

        Nate

        172RG Franklin

          Date: Sun, 10 Nov 2013 20:19:08 -0600

          From: michalk at awpi.com

          To: reflector at tvbf.org

          Subject: REFLECTOR: Franklin Oil temp and flow data

          Okay, I'm going to channel Larry Coen, and the Franklin
          threads that go *WAY* back.

          Today the stars aligned and I was able to measure oil flow
          through the oil coolers.

          Oil flow (blue) max is 3.5 GPM using a book calibration
          factor.

          RPM (green) is divided by 10.

          Pressures (red and orange) are in PSI

          Coolant temp (brown) is more like block temperature
          (uncalibrated).  I put a sensor in an oil plug hole.

          It was about 70F today, not that cold.  The oil flow is just
          very strange.  It didn't start flowing until nine minutes into
          the flight, and I don't think it's a sensor problem because
          the coolant temp leveled off after it started flowing.  If
          this data is correct, I'm not getting enough oil through my
          cooler.  The specs on the cooler are for 7gpm, and I'm barely
          half there.  Yes, I'm having high oil temp problems.

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