Wanting Better Radiator

[Drew MacPherson]

Diesels are more efficient, which means that more energy goes into forcing 
the pistons down than into warming up the coolant.

The cooling demands are greater for a turbo diesel because more air (and 
more fuel) are forced into the cylinder, and the resulting combustion 
produces more heat (relative to the normally aspirated diesel with 
the same displacement.)  Cylinder pressures on turbo diesels are also 
significantly higher, and engine stress is higher.  This translates to 
heat being stored in thermal sinks like the head, block and engine oil.  
Piston cooling jets and oil/coolant heat exchangers first appeared in the 
VW fleet on the turbo diesel.

Drew





On Wed, 10 Mar 2004, Louis-Alain Richard wrote:

> Am I wrong in thinking that a diesel engine produce less heat than a
> comparable gas engine? I always believed that heat was a byproduct of the
> combustion process and a diesel burns less fuel (and is more efficient doing
> so...) so its cooling needs will be less than a gas engine.
> 
> As a matter of fact, some modern European diesel-engined vehicles must have
> a supplementary source of energy for the cabin heating (usually it's a bank
> of electrical resistor placed upstream in the HVAC system) because their
> engines are so efficient. 
> 
> Louis-Alain
> 83 urQ (producing LOT of cabin heat when driven fast...)
> 
> 
> 
> 
> -----Message d'origine-----
> De la part de Drew MacPherson
> 
> The turbo diesel 5K is listed as using a shorter (570mm vs 615mm rad - not 
> to say that it didn't have an extra core.)  It also has one of two 
> auxilliary radiators.  The part number breakdown is below:
> '86 A50T 443 121 251 K 615mm
> '86 A50TD 443 121 251 S 570mm and
> 	443 121 251 B aux rad
> 	or 443 121 251 C aux rad for use in warm countries
> Hope this helps.
> Drew
> 
> 
> 
> On Tue, 9 Mar 2004, Jeff Babcock wrote:
> > I have developed a leak in my radiator in my 86 5Kcstq and was wondering
> > if there was a better choice
> > than the stock unit. I wondered if a radiator from a turbo-diesel 5K
> > series for example, might  have more
> > cooling capability. Or if someone can recomend an aftermarket that will
> > work better.
> > Thanks for your opinions,
> > Jeff
> 
> 
> 

-- 
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84 Wolfsburg Edition TurboDiesel Scirocco
	http://scirocco.cs.uoguelph.ca/gtd
89 Audi 200 Turbo Quattro Avant
99 A3 Jetta TDI
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