[Healeys] Fwd: Re: Oil Cooler on 67 3000

[Robert Blair]

--- Robert Blair <rnbmail at yahoo.com> wrote:

Hi listes, here is the last part ...........

Oil collers continued .....

> 
> 5.  so the oil co trick is a trade off between oil
> viscosity [which is set by the ave temp of the oil
> as
> it circulates and does its job, which in turn sets
> oil
> flow rate/min for a given pump and therefore heat
> extraction from friction surfaces], very wide
> external
> operating ambient temp conditions - phoenis vs
> alaska],and additives to improve or combat the
> above,
> and life between changes.
> 
> 6.  an oil circuit is like an electrical circuit -
> pressure drops across a bearing, just as voltage
> drops
> acress a resistor - oil is the current.  to the
> question of adding an oil cooler - a cooler is
> another
> series resitance in the oil circuit, which will
> generate a pressure drop across it. so the oil
> pressure of the engine will depend on several things
> -
> 1.  where the cooler is placed relative to the oil
> pressure monitor point in the circuit, and 2. the
> cooling efficiency's ability to increase the ave
> viscosity of the oil.
> 
> generally coolers provide a lower oil temp, a higher
> ave viscosity, and a higher oil pressure as measured
> on the input side.  if the pressure is measured on
> the
> downside of the cooler, the pressure may be lower
> due
> to the drop across the cooler - just physics.
> 
> hope this was useful...
> 
> Best, Robert
> San Jose, CA.
> 
> 
> --- Bob Spidell <bspidell at comcast.net> wrote:
> 
> > Just to be argumentative .... why?
> > 
> > Fluids, even hot oil, don't compress--the oil
> > pressure should be the same
> > throughout the system; i.e. the "pumped" pressure,
> > minus leaks (around
> > bearings, etc.).  I always thought a cooler would
> > keep oil, well, 
> > cooler, thus
> > thicker and help keep the pressure up. 
> > 
> > I can't believe friction losses could be that
> great.
> > 
> > 
> > bs


                        Robert Blair
rnbmail at yahoo.com 
Cell: 408-221-5244

   

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