[Vwdiesel] lower compression?

LBaird119 at aol.com LBaird119 at aol.com
Thu Nov 17 23:28:57 PST 2011


 
In a message dated 11/17/2011 6:24:01 P.M. Pacific Standard Time,  
decker at toledotel.com writes:

I don't know what a 1.9 head looks like or if one would fit on a  1.6
block. Does the 1.9 head have combustion chambers? If so how many CC's  are
they? The 1.6 head is board flat except for the valve pockets. Also I  don't
have a 1.9 head and would also have to have a turbo manifold for it  that 
was
made for Quantum or Audi fore and aft mounting. For less than 80  bucks I 
can
have my piston tops lowered on a lathe. I'm just not sure I can  take off
enough meat to get close to where I want to be and still have a  piston top
that I won't readily burn holes in.



You forgot to mention the prechambers.  That's where most of  the volume 
is.  It was just a 
mm or two as I recall, to drop the CR 4 points or so.
  Bore and stroke are available numbers and if you browse the manual  
enough you find the 
thickness of the gaskets I believe.  Somewhere I read the compressed  
gasket thickness 
even.  May have been on a gasket site.  Then add the volume of  the valve 
pockets, which 
can easily vary from cylinder to cylinder and head to head but it's  small. 
 Last new head I 
saw, the valves were higher than the head surface, when closed!  Last  add 
the volume of 
the prechamber, which you'll probably have to cc to find.  Divide that  one 
way or th'other  
by the swept volume and you get the CR.  :-)  I could dig up my  numbers 
but they're for a 
1.5 instead of the 1.6
   Loren


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