[urq] AAN or 3B swap

[Steve Mills]

I do believe the AAN is a better engine, but the AAN can require a lot of fabrication to install. I personally would go with an ABY (late S3) or ADU (RS2) sourced from Europe, or installing an SQ style intake on the AAN that moves the throttle body to the front of the engine. This should minimize the required modifications and also minimize the length of the intake path. 

The alternatives are modifying the AAN intake manifold as stated elsewhere (but I find it hard to believe it will flow properly with this mod) or swapping the intake path over to an RS2/3B style that makes the intake path far longer and moves it right over the exhaust, which are likely to give back the vast majority of the efficiency gains over the 3B. It is also a giant pain to swap out everything you need to make an AAN into an RS2/ABY (late S2) clone- water and vacuum plumbing, throttle and cruise are all very different. 

Steve

> On Feb 2, 2014, at 5:00 AM, "Patrick Carlier" <p.carlier at pandora.be> wrote:
> 
> I'm in exactly thesame situation.
> AAN on a pallet , 3B tuckede in a corner in the attic .
> Both good an complete engines .
> 
> I'l definitly take or at least try the aan route .
> It has e aan has a micro v-belt pulley , wich makes it abt 1 inch shorter
> then the 3B with it's traditional 3 belt pulley .
> That inch makes room for a large front mounted intercooler  wich I took from some
> honda small van .
> 
> The downside for many people of an aan swap is that he intake manifold needs to be
> machined and welded to move the trottle body towards the front .
> Otherwise it'll interfere with the radiator .
> Not sure if the AC compressor and or alternator will clear the radiator .
> Wiring will also need more work compared to a 3B swap .
> 
> I'll keep the list informed of progress .
> 
> Pat
> 
> 
> 
> 
> 
> ----- Original Message ----- From: "John" <johnkarasaki at msn.com>
> To: <urq at audifans.com>
> Sent: Sunday, February 02, 2014 6:50 AM
> Subject: [urq] AAN or 3B swap
> 
> 
>> Ok.
>> 
>> I think the last word on this was from Steve Eiche in 2004. He recommend 3B. But ten years have passed, and list traffic is slow, so why not bring it up again?
>> 
>> The patient: fully gutted, soon to be newly painted early '83. By gutted I mean, totally. All wiring, mesh, interior, everything gone. So this is a total clean slate build.
>> 
>> I have a low mile AAN on an engine stand And a high mileage but never chipped, tracked and always maintained and babied 3B still in a fully functioning, running car.
>> 
>> I have an RS2 intake manifold for the AAN, too, but not the rest of the intake piping for the AAN.
>> 
>> What would you do?
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