90cq to 20v turbo???

[JShadzi at aol.com]

In a message dated 3/4/2001 12:42:56 PM Pacific Standard Time, 
adhand at san.rr.com writes:


> 
> I have been exploring other options, and came across an idea... i know that
> 90 Coupe quattros have a 20v NA motor in them, is it possible to just get a
> 200q20v's exhaust manifold and turbo and turn it into a 3B engine? also, is
> it possible to get a 10v, and put a 20v head on it???
> 
> 

It is not that simple, there is not just one 20v motor, all 20v's are not the 
same.  The 7A, which comes in the 90q is different than the 3B, it has lower 
compression via different pistons for one.  Also, the 7A and 3B come with 
their own engine control systems.  The 7A fuel and ignition systems are not 
designed with forced induction in mind, and fueling would be of huge concern.

Likewise, a 20v head will fit on a 10v motor, but adapting the CIS fuel 
system to a head designed for EFI is also a very big deal.  

These swaps you are considering are very involved and would require much 
part-matching and fabrication to make possible and work reliably.  There are 
no easy swaps when it comes to engines, each engine is designed with its own 
management system, and is designed to fit in specific models.  The only thing 
you can be sure of is that all the 5 cylinder motors mount basically the 
same, and have the same dimensions.  Beyond that, it is customization that 
will make things fit and work.
HTH,
Javad
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