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ABF vs ABA with 16V head...
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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
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<DIV><FONT face=Arial size=2>Brian,</FONT></DIV>
<DIV><FONT face=Arial size=2>Were you talking about a 1.8 16v head or 2.0 16v
head for getting 8:1 on an aba block?</FONT></DIV>
<DIV><FONT face=Arial size=2>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.</FONT></DIV>
<DIV><FONT face=Arial size=2>Al</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Allyn Malventano, ETC(SS), USN<BR>87 Rieger GTO
Scirocco 16v (daily driver, 170k, rocco #6)<BR>86 Kamei Twin 16V Turbo Scirocco
GTX ('it has begun', rocco #7)<BR>87 Jetta 8v Wolfsburg 2dr (daily driver, 260k,
0 rattles, original clutch, driveshafts, wheels :)<BR></FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=bhonnold@pac-cap.com href="mailto:bhonnold@pac-cap.com";>BHonnold</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=scirocco-l@scirocco.org
href="mailto:scirocco-l@scirocco.org";>scirocco-l@scirocco.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, February 14, 2002 1:40
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: ABF vs ABA with 16V
head...</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=715053606-14022002>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.
</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=715053606-14022002></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=715053606-14022002>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.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=715053606-14022002></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=715053606-14022002>The
ABF also has a better higher flowing head, different cams, better flowing
intake manifold and a single butterfly TB.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=715053606-14022002></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=715053606-14022002>HTH</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=715053606-14022002></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=715053606-14022002>Brian H</SPAN></FONT></DIV>
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<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
scirocco-l-admin@scirocco.org [mailto:scirocco-l-admin@scirocco.org]<B>On
Behalf Of </B>Marc Peterson<BR><B>Sent:</B> Wednesday, February 13, 2002
8:34 PM<BR><B>To:</B> scirocco-l@scirocco.org<BR><B>Subject:</B> ABF vs ABA
with 16V head...<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2>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)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Cause I just happen to know where there is a
ABA and a wrecked 2.0 Jetta GLI 16V...</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial
size=2>Marc</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
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