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ABF vs ABA with 16V head...



ABA pistons are dished with a flat protrusion for squish on the rear of
the piston (as installed in the car). 16V squish area is on the front of
the head. No squish. It'd be an effed up combustion chamber.
Dan

Subject: Re: ABF vs ABA with 16V head...
       Date: Thu, 14 Feb 2002 20:04:50 -0500
      From: Allyn <amalventano1@comcast.net>
        To: BHonnold <bhonnold@pac-cap.com>, scirocco-l@scirocco.org
 References: 1

Brian,
Were you talking about a 1.8 16v head or 2.0 16v head for getting 8:1 on
an aba block?
Verry interesting. What do the piston faces look like on the aba
pistons? Are they somewhat flat faced? If the squish area stays somewhat
consistent between the 2, this may be the perfect combo for a high boost
application.
Al
 
Allyn Malventano, ETC(SS), USN
87 Rieger GTO Scirocco 16v (daily driver, 170k, rocco #6)
86 Kamei Twin 16V Turbo Scirocco GTX ('it has begun', rocco #7)
87 Jetta 8v Wolfsburg 2dr (daily driver, 260k, 0 rattles, original
clutch, driveshafts, wheels :)

       ----- Original Message ----- 
       From: BHonnold 
       To: scirocco-l@scirocco.org 
       Sent: Thursday, February 14, 2002 1:40 AM
       Subject: RE: ABF vs ABA with 16V head...

       Yes there are significant differences between the euro only ABF
motor and a US ABA.  The ABF uses the 16v lower crank
       pulley, intermediate shaft and oil pump.  Of course the ABF also
has 16v pistons where the ABA is 8V.  When you put a
       16v head on a US ABA block you get 8:1 compression....not good
for anyting at all but losing races to every honda you
       meet.  
        
       To bring compression back up you can do several things.  Source
out ABF pistons, pay $500+ for custom forged pistons, or
       rebush the ABA rods to use 2.0 16v pistons and wrist pins from a
9A block and get back to 9.25:1 compression and then
       use a thinner Headgasket to get back to the 10.25:1 of an ABF
motor.
        
       The ABF also has a better higher flowing head, different cams,
better flowing intake manifold and a single butterfly TB.
        
       HTH
        
       Brian H

            -----Original Message-----
            From: scirocco-l-admin@scirocco.org
[mailto:scirocco-l-admin@scirocco.org]On Behalf Of Marc Peterson
            Sent: Wednesday, February 13, 2002 8:34 PM
            To: scirocco-l@scirocco.org
            Subject: ABF vs ABA with 16V head...

            Is this just a matter of shaving the head/decking the block
to bring the compression back up, or are there
            other differences between the two...(basic mechanical
issues, I know engine management is different)
             
            Cause I just happen to know where there is a ABA and a
wrecked 2.0 Jetta GLI 16V...
             
            Marc