block over boring

[jdbubb@ix.netcom.com (Dan Bubb)]

The bore spacing, centerline to centerline, is 88mm, so the issue here
may be adequate head gasket between the bores in addition to whether the
cylinder wall will be thick enough to not flex excessively after
overboring.
Audi bored the blocks out to 85mm for BTCC racing, but they probably had
real special head gaskets and were able to x-ray and select the blocks
with the thickest cylinder walls. I think 83.5 is a reasonable maximum
for street use. That gives 4.5 mm (.18") between bores.
Yeah, the kit plus machine work would be more than starting with a 9A.
Dan

Jeff Toomasson wrote:
> 
> Correct me if I'm wrong (and I know everyone will!  :)  but wouldn't
> overboring a PL block and paying for this kit be more $$ unnecessarily spent
> than starting with 9A and just getting the 83.5 mm pistons and having the
> existing block components balanced?
> 
> Doesn't the 9A block itself have a little more "meat" on it as well to bore
> into?
> 
> Jeff (still trying to keep straight the most cost-effective way of doing
> things)
> ----- Original Message -----
> From: "ATS - Patrick Bureau" <pbureau@attbi.com>
> To: <alienj@bad-candy.com>; <scirocco-l@scirocco.org>
> Sent: Friday, June 14, 2002 5:25 AM
> Subject: RE: block over boring
> 
> > as per autotech information on their overbore kit's
> >
> > Bore: 83.5mm; Stroke: 92.8mm; 2035cc ,This kit will transform a standard
> 1.8
> > liter powerplant into a 2035cc monster. When combined with a sport exhaust
> > system and the Euro intake camshaft, the 2035cc 16 valve engine kicks out
> a
> > breathtaking 170 horsepower. The 2035cc 8V with a SportTuned head pumps
> out
> > 150hp.Each kit includes a new Factory forged 2.0 liter crankshaft, special
> > Autotech SportTuned forged piston set, new German main and rod bearings,
> and
> > a special large bore headgasket. Instructions are included for
> modification
> > of oil pump and intermediate shaft. These components are designed to use
> the
> > standard 144mm (1.8L or 2.0L) connecting rods. The compression ratio is
> > 10.5:1. This kit uses an original Volkswagen forged crankshaft to ensure
> > durability, and pistons designed for the rigors of sport use. Without
> > question, this is the highest quality 2 liter sport engine conversion kit
> > available.
> >
> > ==========================================
> > ATS - Patrick Bureau
> > 1985 8v **Planning 3A/JH  Upgrade**
> > 1988 16v ** FOR SALE : 1000.00$ **
> > Web Site : http://longcoeur.com/scirocco
> >
> >
> > =>-----Original Message-----
> > =>From: scirocco-l-admin@scirocco.org
> > =>[mailto:scirocco-l-admin@scirocco.org]On Behalf Of fryer
> > =>Sent: Friday, June 14, 2002 8:59 PM
> > =>To: scirocco-l@scirocco.org
> > =>Subject: block overboring
> > =>
> > =>
> > =>hi folks, just wondering what the largest cylinder size a 1.8
> > =>block can be overbored to ie 85mm or such
> > =>thanks
> > =>chris fryer
> > =>
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