7A to 3B conversion using 7A head and MC2 block?

[Jim Green]

--- Ben Swann <benswann at comcast.net> wrote:
> Goal - 300 HP upwards, but within reasonable budget
> - engine to be installed
> into '83 UrQuattro.  Basically a nice well balance
> powerplant, not
> necessarily trying to win drag races, but will at
> least keep the car from
> getting skunked by the latest WRX or EVO.
> 
> Some sort of EFI conversion could be incorporated,
> but looking at starting
> with the original solution as parts on hand - MC-2
> bottom, MC-1 head ported
> with larger exhaust valves, cam, etc.  MAC-11 ECU
> with QLCC chip augmented
> by supplementary EFI for start is the most
> straightforward, tried and
> tested, as in I know I have the stuff and I know
> what it will do.
> 
> At some point would probably integrate Full EFI -
> constraints being time and
> money of course.
> 
> I was contemplating the 20V engine, as it is
> available for a reasonable
> price and I can get the full 3B Motronic setup - all
> for under 1k.  But if
> getting it to be nearly identical to the 3B will
> cost too much, then I might
> as well forget it.   As I'd need to source
> manifolds, etc. I probably would
> be better finding a wrecked 200 20vtq or complete
> engine.  This starts to go
> beyond my objective of using what is on hand 

Exactly.  Stay on your original track.  The 20vt is
more "bolt on", and will get you past 500 hp, but now
you have drivetrain issues to worry about, etc..  

I assure you my car will be in the 12's with some race
gas next time I get to the strip(assuming I can drive
right).  Probably low 13's on pump gas.  Get the motor
ready, I'd use some inconel exhaust valves, ARP rod
bolts and headstuds, smooth out the ports in the head,
all metal head gasket, S4 windage tray, and your done.
 Use that two-piece EM, then move to a header (Javad's
taking deposits now) after EFI goes in.  Use the Supp
controller to learn about programming, then the switch
to full EFI will be easy.

See, isn't that easy?:)

BTW, use the MC motor, MUCH easier to tune.  When
shooting for 300+ hp on a 10vt, the you really need
the lower compression for it to run properly on pump
gas.  The MC2 ends up being way to retarded on timing
at those levels for my tastes.

Later,

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