ABF vs ABA with 16V head...

[bhonnold@pac-cap.com (BHonnold)]

My understanding is that you can't remove more than about 1mm from a 16v
head....others on the list know what the specifics are.

Of course you can have the block decked as well.  Remember that to use ABA
pistons with a 16v head the pistons must be removed and notched to clear the
valves.

Additionally, if you take more than 1mm off either the head or the block you
will have a timing problem and will have to use an adjustable cam pulley.

BcH

-----Original Message-----
From: scirocco-l-admin@scirocco.org
[mailto:scirocco-l-admin@scirocco.org]On Behalf Of Marc Peterson
Sent: Thursday, February 14, 2002 8:26 AM
To: scirocco-l@scirocco.org
Subject: Re: ABF vs ABA with 16V head...


OK, but if I shave the head down 2 mm and remove 1 mm off the block, then i
should be back near 10:1...

hmm...

Marc
----- 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


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