[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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