Garyd wrote:
Thanks for all that, Michael.
I am understanding two 'recommended' options.
Firstly the Audi 3A engine but fitted with the MKII GTi cam and the AGG inlet manifold. (possibly needing a 2E distributor - or is the 3A one OK?)
Secondly, the AGG or 2E engine fitted with MKII cam, AGG manifold and 2E distributor.
Can the digifant injection rail be fitted to the AGG manifold in either case?
You have said that the torque is developed lower in the rev range with the shorter 3A engine but is there likely to be much difference between the two options? I am currently having no success finding a 3A engine but AGGs seem to be fairly plentiful. Being newer they are also perhaps likely to be in better condition.
Dp you think there would be any advantage in trying to modify the AGG manifold to take the twin barrel MKII throttle body? I am thinking that the first (small) barrel could be more fuel efficient on light throttle openings.
thanks Garyd
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3A distributor will work, it is the same as the 2E and later Mk2 digifant disrtributors. Just has the hall pick up inside and a 4 slot rotor.
The 2E and AGG will run smoother than the 3A, apparently because of the longer rods, hence the reason VW did this. The 3A , being shorter will give you that much more clearance to the LH side/chassis of the engine bay.
Having not compared the 3A and 2E/AGG back to back I cannot say if there is much difference low down, but technically there should be. In the real world? Who knows if it really makes a seat of the pants difference.
I used a Mk2 digifant fuel rail on my 2E conversion, mounted in the AGG inlet manifold, however it required mounting fabrication and the fuel inlet and return were not in the optimum place.
I have since looked at the fuel rail off a 1992-1994 Audi 80 2.0l ABK engine code, and this would seem to be ideal.
I also think the AGG fuel rail would be fine, I was just paranoid that the injectors were different. i.e impedance, etc.
I do not actually think this this would be an issue in reality
I cannot quite remember why I did not use the 2E fuel rail, after all the 2E is also digifant. Maybe fitment issues to the AGG inlet manifold?
I am presuming you want to stick with Digifant injection and management?
If not I would just go AGG with all the injection/management parts from that.
The only reason I did not do this is because of my Dutch genes. i.e. too tight to spend the money
------------- m.rodent
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