How do I make the best 16v for my style of driving?

[sports racer]

After doing some research it seems a good combo is the 9a block with the ABF head. The 9a block is normal height so no clearance problems if I decide to fit the fuel injection off the Seat and the ABF head has the following advantages over the 9a head:

Small 27mm dia exhaust valve on 27mm seat for improved flow of hot exhaust gas
Cooling passages in the exhaust port to reduce hot spots and improve durability
Cooling channels in inlet port to improve/vaporisation and wall warm up.
Cooling passages in the combustion chamber to reduce hot spots and improve durability.
Improved squish areas working with revised piston.
Optimised valve shrouding on the inlet toward spark plug hole
optimised head shape around the shrouded part of the exhaust valves.
Reduce valve guide protrusion.
Reduction in port casting imperfections.
In/Ex Port flow improved over "51***373" heads.

Late model 9a motors had the same head casting numbers as the ABF motors so there shouldn't be any problems fitting the ABF head. The only difference was the inlet and exhaust cams.




This is the bit that convinced me to use the ABF head. It develops more power and it has a similar torque curve to the 9a so running the wilder ABF cams isn't going to kill my low down torque.



Lots of info here.

A VW 16v camshaft study.

[Mk1@4Motion]

Why don't you just run the ABF with a small turbo?


Only The Good Die Young 45

[sports racer]

I don't want that much HP. This car is being built to do the drive to Canberra and back each day and I don't want something that's too fast like my old Bolwell Nagari (1000kg, 350 hp) which kept eating my licence.

I like the idea of having something that will overtake cars but still need a bit of planning before I overtake.

[gldgti]

Keep it basically stock then I reckon. It should be perfect!

[Mk1@4Motion]

Yeah, just rebuild the ABF with a few internals changed for a bit more power.


Only The Good Die Young 45

[sports racer]

I'll rebuild the 9a I got from you. It needs a rebore and new pistons which isn't cheap but should give me an engine that's good for another 20 years.

From all the posts on overseas forums the ABF in a MK1 isn't a good crusing motor. Great for racing, lousy for relaxed driving.

[Mk1@4Motion]

Well, there you go then. And I am sure you can get a bit more torque out of the 9A to make it a better cruising motor than it is standard.

I am surprised you aren't doing the ABF for the Mk2 and the 9A for the Mk1?

Only The Good Die Young 45