Date: Mon, 1 Jul 2002 16:08:39 +0100
Reply-To: Clive Smith <clive.harman-smith@NTLWORLD.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Clive Smith <clive.harman-smith@NTLWORLD.COM>
Subject: Fw: Reduced oil temperatures..
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Clive Smith" <clive.harman-smith@ntlworld.com>
To: <kdlewis@juno.com>
Sent: Monday, July 01, 2002 1:12 PM
Subject: Re: Reduced oil temperatures..
> This is in general, as its a percentage. Just take the square of 70/60 =
> 7/6 * 7/6 = 1.16666*1.16666 = 1.361
> Then I added a small % for increase in running gear drag. So 40% would be
> pretty near the mark for any vehicle. That's why long distance cruising
> speed is critical to get right if you're short of fuel. 50ish mph would be
> the optimum for range if you had the time, see my comments on constant
> energy driving techniques against the earlier subject of radiators and
> hunidity.
>
> This represents the increase in wind drag, regardless of the shape,
although
> there may be discontinuous effects, such as when the Reynolds No is near
to
> a critical value and the whole flow pattern changes.
>
> If there was interest, we could probably work out the drag coefficient,
> knowing top speed and frontal area and max power, but the running gear
> friction and tyre scrub figures would all have to be estimated, obviously
> syncros are worse. But once above 50 mph, by far the dominant factor will
> always be aerodynamic drag, as it's always increasing with the square of
the
> speed.
>
> Its proportional to frontal area, and the pop-top/ different vanshapes
alter
> the area a bit and drag coefficient quite seriously in the case of
clutter
> on the roof - hence I run a straight van here, fuel is knocking on
> $5/gall...
>
> Clive Smith
> '89 T25 Syncro Transporter
>
> ----- Original Message -----
> From: <kdlewis@juno.com>
> To: <clive.harman-smith@NTLWORLD.COM>
> Sent: Monday, July 01, 2002 11:25 AM
> Subject: Re: Reduced oil temperatures..
>
>
> > Clive;
> > Is this in general or does it take into account the brick shape
> > of our vehicles?
> >
> > Good Luck and Drive Safely
> > Ken Lewis
> > 86 Crewcab,60 356
> > http://Neksiwel.20m.com/
> >
> > On Mon, 1 Jul 2002 00:17:22 +0100 Clive Smith
> > <clive.harman-smith@NTLWORLD.COM> writes:
> > > Out of interest, going from a 60 to 70 mph cruise would require about
> > > 40%
> > > more power from the engine, which may explian the relatively large
> > > increase
> > > in oil temperatures.
> > >
> > > Clive
> > > T25 Syncro Transporter van
> > >
> > > ----- Original Message -----
> > > From: "Kenneth Lewis" <kdlewis@JUNO.COM>
> > > To: <vanagon@GERRY.VANAGON.COM>
> > > Sent: Sunday, June 30, 2002 4:14 PM
> > > Subject: Reduced oil temperatures..
> > >
> > >
> > > > This list is great, I was just getting ready to battle the
> > > > archives for this information when Mr.Grunthaner so generously
> > > saved me
> > > > the trouble.
> > > > I just got done installing a VDO oil temp gauge on my
> > > WBX. Since
> > > > I am using an oversized oil drain plug I had to locate the temp
> > > sender
> > > > elsewhere. I ended up removing the oil filler tube and fabricating
> > > a
> > > > plate to hold the sender and cover up the now open oil entry hole.
> > > I then
> > > > replaced the oil breather tower with two CB Performance products,
> > > a
> > > > "Hi-Tech Oil Filler" #1776 which screwed into "Crankcase Vent &
> > > Oil
> > > > Filler" # 1744. These two parts made a new aluminum tower vent
> > > with oil
> > > > filler cap on top(http://neksiwel.20m.com/images/oil1.jpg ). I was
> > > > worried about increased oil loss but so far so good.
> > > > Over a year ago a list member made a seemingly outrageous
> > > > statement;" I have noticed a ten to twenty degree reduction in oil
> > > > temperature running the level at the bottom line of the dip
> > > stick..."!
> > > > Specifically during seventy plus mph hiway driving. Supposedly
> > > due to
> > > > windage produced by the cam. I will be checking this out. I was
> > > surprised
> > > > to see how quickly the oil temperature jumps from 195ºF to 220ºF
> > > when you
> > > > increase speeds from 60mph to 70mph.
> > > >
> > > > Good Luck and Drive Safely
> > > > Ken Lewis
> > > > 86 Crewcab,60 356
> > > > http://Neksiwel.20m.com/
> > > >
> > > >
> > > >
> > > >
> > > > .....The Vanagon is a high stress application for any 2.0L engine.
> > > Oil
> > > > temperature is critical. Shouldn't be much below 200 F and not
> > > above 235
> > > > F.
> > > > The heavy duty VW applications use a very effective thermostatic
> > > valving
> > > > system to keep oil temperature above 180 F at all times. The oil
> > > must be
> > > > hotter than 180 to get rid of sulfuric acid residues and other
> > > combustion
> > > > byproducts., not to mention dissolved gasoline.
> > >
> >
> > ________________________________________________________________
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>
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