[s-cars] Oil Cooler Pics posted...

[Paul Friedenberg]

Scott,

Oil, like most other fluids seeks its own level. But thanks

Even if my guage is innacurate, it still read higher with the stock oil
cooler.

American A/C lines see pressures well above 150psi and use rubber hose with
barbed hose clamps and don't seem to have any problems.






>From: QSHIPQ at aol.com
>To: tedebearp at yahoo.com, paulunm at msn.com, s-car-list at audifans.com
>Subject: Re: [s-cars] Oil Cooler Pics posted...
>Date: Thu, 14 Nov 2002 08:34:36 EST
>
>Ok, saw the pix, I'll put in my .02.
>That sure appears to be a standard issue 19row oil cooler listed in the pic
>(I gots the same one in my 83 urq), you can use it for a variety of fluids,
>including water..  A couple of suggestions.  First, mounting it upside down
>creates a potential problem.  Oil drain back into the pan will occur when
>hot
>and you will have overfilled your oil causing oil leaking at the rear crank
>seal.  Checking oil levels is a best guess scenario,  actual level will
>depend on a couple things, but you can observe anything from +.5 to -.5
>quart
>depending - neither is a good thing.  ALL audi turbos since 1983 have a
>100c
>oil thermostat from the factory.  I'd highly suggest using rubber isolators
>for the mounting, rigid mounts tend to cause the tank braizing to crack,
>causing leaks.  VW and audis are infamous for high oil pressure on startup.
>150psi+ is quite often seen, btmt.  Rubber hose clamp connections should be
>replaced with something more substantial, you can get a good race shop to
>adapt your stock lines to fittings on the cooler (assuming they are -10AN
>fittings, which is what you should be using on the audi oil lines - not -8
>or
>-12).  IMO, the 19 row is equivelent to the stock oil cooler with good
>ducting, a bit more if you mount it well (better surface area vs depth),
>btmt.  A 25 row is a better choice for the audi turbos IME.  A 25 row will
>fit behind a stock S4/S6 bumper with very slight trimming of the inside
>bumper trim, btdt.  Assuming this cooler to be hooked to the stock oil line
>ports on the oil bracket, one should see 100c, the size of the cooler will
>dictate how far above that mark the car will go under extreme use.  Don't
>trust ANY audi guage to give you actual readings of anything.  Here a quick
>zap with the IR gun is a better measure of what's happening and a quick way
>to "calibrate" that audi guage, and to measure temp drop across the face.
>Over the years, I've measured dozens of audi turbo oil temps, here's my
>summary wrt them.  With 19row OC and good ducting, you should see temps
>averaging around 10-15c lower than the stocker, with  a 25 row, you should
>see temps averaging in the 20-30 temp drops (all else being equal), which
>means the 25 row pretty much sits at 100c for 90% of it's life.  On really
>hot track day 90 degrees at Blackhawk full RS2 battle gear, I've seen 25
>row
>peak at 120 or so.  What you do observe is 100C temps before you get to the
>paddock, something the stocker doesn't seem able to do.  I completely agree
>with Teddy that oil should get to 100c, anything lower and you aren't
>vaporizing the moisture out of the oil, offsetting the oil cooler gains
>with
>a water infested recipe.
>
>My own suggestion is that the stocker vs the 19row is a wash.  Bob Dupree
>actually put a "track scoop" on the stocker, and sealed it well.  This
>resulted in oil temp drops similar to the 19row application in my 83 urq.
>
>
>HTH
>
>Scott Justusson
>QSHIPQ Perfromance Tuning
>Oil coolers aplenty
>
>In a message dated 11/13/02 7:33:08 PM Central Standard Time,
>tedebearp at yahoo.com writes:
>
>
>--- Paul Friedenberg <paulunm at msn.com> wrote:
> > Darin, Thanks for posting, you are a great asset to us website retards.
> >
> > Guys,
> >
> > The oil cooler is a unit that was supposed to be used with a liquid to
>air
> > intercooler system for a mustang (can't remember the brand, procharger
> > maybe?) it was meant for water, but works better for oil. It is similar
>to
>a
> > motorcycle radiator. I had rubber lines fabricated to bolt up to the
>motor,
> > and they are hose clamped at the cooler. I am having some oil seepage,
>but
>I
> > think that's an easy fix. The cooler itself is mounted to the frame rail
> > with some hand made aluminum brackets. My oil stayed fairly cool before,
>I
> > once saw 130 on a 95 ish day, up a steep grade at sustained 100mph+. Now
>the
> > oil never goes above the first tic mark, even at high speeds in 90-100
> > degree weather.
>
>paul,
>
>i'm not quite sure what you're saying, but this thing looks like an oil
>cooler to me.  they probably took it and used it for water.  i definitely
>wouldn't want to take a heat exchanger designed for water and use it in
>an oiling system without doing some checking first.
>
>the viscosities of oil and water are different.  i don't know if you
>can take a heat exchanger meant for water and use it for oil.  it
>depends on the particular heat exchanger.  another issue is whether
>the heat exchanger is designed to withstand the higher pressures seen
>in an oiling system.  the cooling system doesn't see much more than
>16-24 psi.  the oiling system, on the other hand, sees 30 psi (2 bar)
>at idle when warm and 90 psi (6 bar) above idle.  i'm sure the pressure
>spikes higher than that when you start the engine.  radiators aren't
>built to withstand those kinds of pressures.  even if it holds together
>the first few times, that's no guarantee that it won't blow up the 100th
>time you start the engine.
>
>i'd also be concerned about the rubber lines and hose clamps.  oil is
>the lifeblood of your engine, and rubber hoses have been known to blow
>up with pressure spikes.  i'd much rather use braided stainless steel
>hose with screw-in fittings, such as AN fittings or NPT fittings.
>
>and if you blow it up at speed, you could wind up oiling your tires
>and stuffing the car into a wall.
>
>so what temperatures are you seeing for the oil?  oil should be around
>220-240 degrees F.  if you're not going above the first tick mark,
>which is 60 degrees C or 140 degrees F, the oil isn't hot enough.
>i would install a thermostat if that's the case.
>
>-teddy
>
>


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