REFLECTOR: Subject line

[Velocity]

Might want to change subject line to cover what you are discussing. Makes it easier to fallow along.

Ron
  ----- Original Message ----- 
  From: aminetech at bluefrog.com 
  To: Velocity Aircraft Owners and Builders list 
  Sent: Wednesday, January 28, 2009 10:28 AM
  Subject: Re: REFLECTOR: Reflector: a current pic of my plane


  Phil Davis who overhauls Franklins and will be servicing my bad cylinder, says 50-60 psig is a good pressure.  Mine is 40-50 depending on oil temp.
  Phil confirmed the spec sheet I have that says the oil temp should be measured at the engine inlet for Franklin engines.  My spec sheet gives an oil temp limit of 230 F so I guess I'm in good shape.
  Phil said that any by-pass would be located outside the engine case near where the oil lines connect.  I have to check, but I don't think I have one.  I'm not sure I need one for warming the oil since the cooler doesn't do much when the plane is parked.
  I'm still checking into over pressure protection.  Seems like it is a necessity for any positive displacemtment pump.
  I have a spec sheet for the Franklin.  It's too big for the reflector, but I can send it direct if anyone wants it.

  John

  --- jeffreyhowell at hotmail.com wrote:

  From: Jeff Howell <jeffreyhowell at hotmail.com>
  To: <reflector at tvbf.org>
  Subject: Re: REFLECTOR: Reflector: a current pic of my plane
  Date: Wed, 28 Jan 2009 07:53:54 -0800

  depending on ambiant temp and normal opperating temp the viscosity of the oil changes, also there is a chart for the proper viscosity oil according to the  temp of your area. I am getting a little bit of blow by and a little bit of oil on my prop from my govenor. I am wondering if my oil pressure is too high. What should the oil pressure be on a franklin? thanx Jeff 

  > Date: Wed, 28 Jan 2009 07:54:25 -0700
  > From: scott at tnstaafl.net
  > To: reflector at tvbf.org
  > Subject: Re: REFLECTOR: Reflector: a current pic of my plane
  > 
  > > *Isn't the crankshaft seal exposed to the crankcase pressure? How does 
  > > oil pressure affect the crankcase pressure? Isn't there a pressure 
  > > relief valve to limit max oil pressure?
  > 
  > With a constant speed prop there are prop seals on the crankshaft, there 
  > are also lifter seals, oil pump seals, crankcase seals, etc. Maybe not 
  > the external crankshaft seal. If the engine experiences too high an oil 
  > pressure things will blow. The limiter is limited by the viscosity of 
  > the oil.
  > 
  > > *I assume it needs to be measured not only before the cooler, but at the 
  > > engine. If the flow to the cooler is diverted when the oil is cold, 
  > > then a sensor just before the cooler won't tell me the right temp 
  > > either, correct?
  > 
  > My E225 had its oil temp probe at the filter housing. My IO360 and 
  > TSIO520 have the probe in the remote cooler adapter. All three see the 
  > oil temp of the oil in the engine because the vernatherm bypasses a 
  > small amount of oil into the cooler line when closed.
  > 
  > Scott
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