Re: Overbore w/ stock pistons?

["Dan Bubb" <jdbubb@ix.netcom.com>]

I don't want to be too negative, but any process  that polishes removes
metal! Maybe not a lot, but polishing sure doesn't add metal! Running a hone
up and down the bore for a short period can easily open the bore .001"
depending stone grit and tension of the hone.
The shop manual specifies maximum piston to cylinder clearance. Spec on new
parts is 0.001" clearance. Wear limit is 0.0025" clearance, so you can only
remove an additional 0.0015" and still be in spec. This amount of material
removal isn't going to clean up much bore damage and your bores may already
be at the clearance limit just due to normal wear.
I've seen engines that were honed out substantially to clean up bore damage,
but the engine's going to burn oil and the pistons and rings won't last long
due to the fact the piston can cock in the bore.
Dan

----- Original Message -----
From: Craig Williams <roccolister@hotmail.com>
To: Benjamin Harder <vwtype53@yahoo.com>; <scirocco-l@scirocco.org>
Sent: Friday, November 30, 2001 1:50 AM
Subject: Re: Overbore w/ stock pistons?


> Ben,
>
> I think what you really want to do is just hone the cylinders. That
process
> doesn't take any metal off, it just goes in and polishes things up.
>
> -- Craig
>
> ----- Original Message -----
> From: Benjamin Harder <vwtype53@yahoo.com>
> To: <scirocco-l@scirocco.org>
> Sent: Thursday, November 29, 2001 8:46 PM
> Subject: Overbore w/ stock pistons?
>
>
> >   That's the question...if you were to use the stock pistons
> > with new (stock) rings, can you do a *slight* overbore...just
> > enough to clean up the bores if they have some scoring?
> > If so, can anyone with some first-hand experience share some
> > specs that are acceptable...
> >   Also, I have yet to find a website with pics and tips for
> > doing an engine rebuild...anyone know of one?
> > TIA!
> >
> >
> > =====
> > Benjamin Harder
> > 86 Scirocco 16v
> > 80 Scirocco
> > 93 Passat GLX
> >
> > http://www.geocities.com/vwtype53/
> >
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