[Vwdiesel] New head gasket

[David Cook]

Interesting.  Every head gasket I've done (admittedly
only 3-my diesel, and a couple old GM 4-bangers) has
had smaller holes in the gasket than in the block.

I remember someone on the Corrado list mentioning this
on the VR6 engine as a means to lowering emissions by
raising head temps slightly.

David


--- Val Christian <val at mongobird.com> wrote:

> Sandy,
> 
> That is totally new to me.  
> 
> Thinking about it, I would hate to have a point in
> the cooling system,
> where there is a "constriction" in a location such
> as the cylinder head.
> Perhaps I'm just to risk adverse.
> 
> The last couple of head gaskets I put on have not
> had this "feature".
> 
> The most recent was my 91NA this summer, also with a
> Victor Reinz
> gasket.  Still have the packaging on the shelf...
> 
> Val
> 
> 
> > 
> > I picked up a new head gasket at my favorite parts
> place today for my son's
> > 91NA.
> > 
> > It is a Victor Reinz, made in Germany, and appears
> to be very good quality.
> > 
> > As I studied it, I noticed something I had been
> unaware of with the previous
> > 4 or 5 I have changed.
> > 
> > The water passages in the block and head are
> "bean" shaped, or as my wife
> > would say, paisley. The water holes in the new
> gasket are round, quite a bit
> > smaller than the passages in the head and block,
> and are 'very?' small
> > around cyl #1, and quite a bit larger around #4.
> > 
> > I had not noticed this before. I thought the holes
> in the gaskets were the
> > same shape as in the metal.
> > 
> > After some contemplation (no Zen) I figured the
> holes around #1 were smaller
> > because it was closest to the water pump outlet,
> therefore these would limit
> > the flow a little at the front of the head, and
> the large holes at the back
> > would encourage more flow the length of the block,
> heading for the exits,
> > resulting in the same net flow around each
> cylinder top in the head.
> > 
> > I guess people out there really are thinking. This
> is something new to me,
> > but it makes sense. Passive distribution
> equalization of the coolant.
> > 
> > A good job for one of those remote IR meters (I
> have to get one) Good for
> > checking glow plugs too.
> > I'll snap a pic of it before installing, for the
> archives.
> > 
> > Sandy
> > 
> > _______________________________________________
> > Vwdiesel mailing list
> > Vwdiesel at vwfans.com
> > http://www.audifans.com/mailman/listinfo/vwdiesel
> > 
> 
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> 


David Cook
Red '86 Cabriolet Diesel Powered
Red '90 g60 Corrado 
Brown and White '78 Westy Campmobile "Bear"
and others in various states of disrepair
Pictures here: community.webshots.com/user/superdave5599


		
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