9A Block Decking/Head Milling

[vwnuts@yahoo.com (Anthony Pelletier)]

a stock gasket is aproximately .071"  for compression
ratio's the easy way check out 

http://intenz.gotdns.com/~eric/cars/turbo/compression/compression.html


--- Allyn <amalventano1@comcast.net> wrote:
> Ron,
> unless http://scirocco.dyndns.org/engine/ is wrong,
> the 9a block/head combo is
> 10.8:1, not 10:1.
> either way, here are some cc numbers i whipped up
> for ya (for 9a):
> cylinder volume: 496.07cc, total volume: 1984.29cc
> using the following equation: combustion volume =
> cylinder volume/(comp ratio-1)
> heres a chart i whipped up:
> combustion volumes (tdc):
> 10.0:1 - 55.12cc
> 10.5:1 - 52.22cc
> 10.8:1 - 50.62cc
> 11.0:1 - 49.61cc
> 11.5:1 - 47.24cc
> c/r starts going up sharply as you get further past
> 10:1. bore area is 53.46
> cm^2, so 0.005" yields a combustion volume change of
> .6789cc. since c/r works in
> a non-linear fashion, you'd have to compare math
> results to the c/r chart above
> to get a good number, or just use the formula if you
> are going for exactness
> 
> as for the head gasket stuff, i know headgaskets.com
> has them available in
> various thicknesses, but they are engineered for
> thicker, not thinner
> applications (lowering c/r for high boost, etc).
> 
> no clue on thickness of a stock gasket. wish someone
> had some numbers there, as
> getting the correct starting point for messing with
> c.r is key.
> 
> hth
> Al
> 
> Allyn Malventano, ETC(SS), USN
> 87 Rieger GTO Scirocco 16v (daily driver, 180k,
> rocco #6)
> 86 Kamei Twin 16V Turbo Scirocco GTX ('it has
> begun', rocco #7)
> 86.5 Occo 16v Trailer (dotting 'i's across the
> country, rocco #8)
> 87 Jetta 8v Wolfsburg 2dr (daily driver, 260k, 0
> rattles, original clutch,
> driveshafts, wheels :)
> 
> 
> ----- Original Message -----
> From: "'Cheapass' Ron Pieper" <rapieper@yahoo.com>
> To: <scirocco-l@scirocco.org>
> Sent: Thursday, August 22, 2002 11:01 AM
> Subject: 9A Block Decking/Head Milling
> 
> 
> > Hey all,
> >
> > Anyone have experience on how much I can
> (practically) deck the block
> > and/or mill the head on a 9A 2.0L (assuming I'm
> using the 2.0L head)?
> >
> > How much will the CR raise for every, say, 0.005"
> off either surface?
> > How much will I raise the risk of damage if
> interference should ever
> > happen?
> > Anyone have sources or experience regarding
> thinner head gaskets?
> >
> > Yes, I'm already starting with a 10:1 CR, and
> detonation is a
> > concern...but please don't let that stop you from
> offering input to the
> > above.
> >
> > TIA,
> >
> > Ron
> >
> > =====
> > Cheapass Ron
> > '87 Scirocco 16Victor
> > Pet Peeve du jour:  It's GTI not GTi!!  Read the
> nameplate!  (US only)
> >
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> 
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