ABA turbo question again

[jdbubb at verizon.net (Dan Bubb)]

Decking a 16V head isn't a good idea from my point of view. The intake valve seats are very close to the deck on a stock head.
As far as machining the pistons, I think that sort of defeats the purpose of combining an 8V block with a 16V head, which is a cheap way of lowering the CR, even if it isn't exactly the CR you'd like. The cost of machining the pistons, plus new rings and various bottom end gaskets can add up pretty quick.

If you just wanted to run a 9A and lower the CR, of course you can install new pistons, but again it's going to cost a lot more money than the cheapassed 8V block, 16V head route. Forged pistons, bore the block, gaskets, etc, etc.....
just my .02
Dan


From: "Brian Spinney" <vw_85roccoZ400@hotmail.com>
To: "Dan Bubb" <jdbubb@verizon.net>; "David Brown" <sharpshooter33@roadrunner.com>; "scirocco scirocco" <scirocco-l@scirocco.org>
Sent: Tuesday, January 02, 2007 8:53 AM
Subject: Re: ABA turbo question again


> 
> 
> From: "Dan Bubb" <jdbubb@verizon.net>
> Sent: Tuesday, January 02, 2007 7:25 AM
> Subject: Re: ABA turbo question again
> 
> 
> I am not a 16vT guy in fact I know very little about 16v so please bare with 
> me here.
> 
> 
> 
> > Dan wrote "By my calculations the CR will be 7.9:1 with 16V head on either 
> > an ABA or 3A block with stock pistons."
> 
> 
> 
> I figure this isn't the easiest or best way to achieve a better CR ratio, 
> could you deck the 16v head & have a machine shop add in more clearance to 
> the intake cutout, and add an exhaust cutout??
> 
> 
> 
> > You could probably turbo a 9A, but with its 10:1 or 10.5:1 or 10.8:1 (or 
> > whatever anybody claims!) you'd be limited to pretty low boost like 5 psi or 
> > so."
> 
> 
> 
> But couldn't he get away with running lower compression pistons in this 
> case?
> 
> -Brian
> 85 Scirocco 8vT       01 Jetta 20vT       84 Rabbit GTI
> 86 Bronze Scirocco 8v
> 
> From: "David Brown" <sharpshooter33@roadrunner.com>
> Sent: Tuesday, January 02, 2007 12:36 AM
> Subject: ABA turbo question again
> 
> 
> Ok so I gotta ask this again because maybe I read it wrong earlier.  If I 
> use a ABA block n pistons or a 3A block n pistons with a 16V 1.8 head will I 
> get a compression that is workable for a turbo?  Would there be any other 
> issues with this setup( head block piston combination?)?
> 
> 
> Or do I need to look at WIseco low compression pistons?  I was thinking that 
> I would only need to lower the compression if I used a 9A which had 16v 
> Pistons in it???
> 
> Thanks
> David
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