2.3 NF /MC-1 and other combinations..

Bernie Benz b.benz at charter.net
Fri Feb 21 15:16:07 EST 2003

You've answered your own Q, if you really have a thin wallet, but still are
thinking fat.


> From: ben swann <benswann at comcast.net>
> Date: Fri, 21 Feb 2003 17:23:03 -0500
> To: JShadzi at aol.com, apritchard at seaeye.com
> Cc: quattro at audifans.com, auditude at cox.net, benswann at comcast.net,
> mik at info.fundp.ac.be, tlum at flash.net, ackramer at hotmail.com,
> duandcc_forums at cox.net, Eric_R_Kissell at whirlpool.com, bradym at sympatico.ca,
> audi at humanspeakers.com, 200q20v at audifans.com
> Subject: 2.3 NF /MC-1 and other combinations..
> I know I interjected a few seemingly hypothetical questions, in the
> recent discussions on head, block and other combinations, but I do have
> a real situation and decisions to make based partly on my available
> resources: time, a collage of parts, but not much $$.
> My goal is to transplant my rebuilt MC-1 engine and many new parts and
> goodies into a recipient '88 pearl wagon that I should be getting, if
> all goes well.
> I don't necessarily want to take the head off of what was a good
> runner, but the MC-1 engine will be out, and I'll have the time to make
> improvements if they are justifiable.  I have the nice '91 200 20V
> avant to drive for now, but economics and the desire to continue what I
> started prevail.  So my hope is to build/rebuild an identical, somewhat
> improved pearl quattro avant.
> A couple of options for the engine improvements:
> 1)Install 40 mm Exhaust valves in already ported MC-1 head.  Will this
> require new seats, or can I enlarge the existing seats to accomodate
> the larger valves?  How much are the valves?  Machine shop costs to
> reseat for 40mm exhaust valves into the head if needed?  Is this
> something that can be done with a drill press and new seats, or does it
> require any special equipment?  I'd like to do it myself if possible.
> 2) Acquire NF head and port/polish that one.  I take these are not hard
> to come by - Is this basically the same as the MC-1 head only larger
> valves?  Although this may require some extra work and time, it may be
> more economical than installing the larger valves in the MC-1 head,
> which I suppose I can sell with original cam, etc or ???
> 3) NG head - I have pretty much ruled this out, since it is already
> installed on a nicely worked motor; too much re-plumbing, etc..I just
> need a good weekend(without any accidents or snowstorms) to install
> that motor into Project GTQ - '85 4kq.
> 4) leave the intact motor together and concentrate on improvements
> outside the head/engine which already was running well.
> 5) other?  I am trying to keep costs down.  This can be very low budget
> for me, since I have the reworked motor, and the car will be cheap.  I
> already paid a lot for the parts when I rebuilt the first time, and the
> motor only has 10k on it - just broken in.
> Here again is what I had done to the engine prior to the accident,
> which helps explain why I want to do something with it, rather than get
> 2 pennies for it:
> '87 5000 CS turbo quattro avant - Engine rebuilt incl. following -
> T03/K26 hybrid turbo.
> Elgin 260i254e cam
> adjustable cam sprocket
> new valve seals, lifters & techtonics springs
> new piston rings, connecting rod and main bearings,
> all new seals.
> 2-Piece Exhaust manifold, highflow cat and 2.5" Stebro exhaust.
> All visible casting flash removed from components.
> Mild port and polish to head and manifolds with ports matched.
> Bypass valve located in intercooler
> where untapped hole was with bypass
> flow directed toward turbo
> **Supplimentary fuel injector installed in intercooler
> controlled by 034EFI
> - injector is inline just prior to throttle body hose.
> 200 Flywheel, Clutch and Pressure plate, slave cyl.
> QLCC chip with variable resistor modded ECU,
> Schrapnel Knob + 2 bar SJM spring for control
> ­ was running comfortably at 16 PSI.
> My educated guess is the setup was good for just shy of 250 HP before
> enabling the EFI controlled injector and I can crank the boost until it
> detontes.  I never had a chance to enable the injector, as the car was
> totalled just prior to finishing.   I expected after the injector gets
> turned on 275 or more???   I don't know, and maybe that is a flight of
> fancy, but it was already no doubt fast.
> This may be the time to obtain a nice custom intercooler, as the
> modified stock one is damaged.  Perhaps I can rework the fuel injection
> entirely to EFI, but I don't want to spend much money.  The reasons,
> I'd consider reworking it this time is 1) I have 035EFI controller 2)
> the CIS Air box is damaged.
> I hope this isn't throwing the other portion of the discussions off, as
> I know Alan and others need solution that meet their engine objectives
> as well.  Hope throwing my grist into the mill helps rather than hinder
> and keeps us all appraised of what the others are doing.  That's what
> it's all about, right?
> Cheers and good weekend to all.
> Ben
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