james accordino ssgacc at
Fri Aug 9 17:19:50 EDT 2002

Cool Huw.  You're reading my mind man.  Where is the
oil to water exchange?  Through some metal that is a
heat sink in and of itself?  The oil temp is only
controlled by the capacity of the oil cooler.  All
other cooling is negligible at best.  Water, OTOH
looses heat EVERYWHERE it can. It will dump heat into
everything it comes in contact with.  Or near contact
with.  IMHO, water loves to give up it's heat.

Jim Accordino

--- Huw Powell <human747 at> wrote:
> > > it's not the head that heats the oil to 150 C,
> it's the two *really* hot
> > > places it goes, which are the turbo and the
> backs of the pistons.  Of
> > > course the turbo is also water cooled, so it is
> not such a factor.
> > > However, the oil sprayed on the pistons gets
> some serious exposure to
> > > heat, and then *is not* water cooled before
> passing the temp sender.
> >
> > yes, that's true.  and plus the specific heat of
> water is so damn high
> > that I can buy that you wouldn't see violent
> swings in the coolant
> > temps.. but eventually a 150c oil temp HAS to
> transfer some heat energy
> > to the coolant.
> It does.  But follow the oil flow for a second here.
> The very hot oil from the back of the pistons falls
> back into the pan -
> no water cooling there.  Next stop, the oil pickup,
> then the pump, and
> the oil temp sender.  The oil has not yet given up
> its extra heat to the
> water.
> Finally it gets pumped around the block, head, and
> everywhere else,
> where it can drop some heat, via the metal which is
> hotter?  into the
> water.  Are there any places in the flow pattern
> that could truly be
> considered oil to water heat exchangers?
> --
> Huw Powell

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