MC-1 MC-2 - Block any difference?

[Jim Green]

--- Ben Swann <benswann at comcast.net> wrote:
> Before I get too deep into my Ur Quattro engine
> build I am doing some sanity checks, and trying to
> combine the best of what I have.
> 
> Is there any difference between an MC-1 and MC-2
> block other than the crank, rods and pistons.  I
> would like to use the MC-2 setup, but the MC-1 block
> I have is a litle closer to prepping for rebuild. 
> Can I just take the pistons and crank and install
> them in the MC-2 block.  I'll be doing the works on
> whichever block I use - new seals, bearing, rings
> etc.
> 
> Any serious reasons not to use MC-2 over an MC-1?  I
> know the compression is a little higher.   I will
> likely not not be using the fuel injection system
> from either, so I am asking with regard to issues of
> compression, etc.  Head, etc. being used I
> anticipate will flow way better than stock, and I
> should be able to force as much  fuel and air as I
> want.   What are the Tradeoffs between the two.
> espcially if the issues of fuel injection systems
> are disregarded?


Ben, they are the same in every way except for the
pistons, so you can mix and match whatever you want.

The only problem I have with the MC-2 is the higher
compression.  If you're really going to hod rod the
ur-q, then you probably want the MC.  The MC-2 gets
really testy above 15 psi on pump gas.  The MC is much
easier to tune, and you can run a pretty normal
advance on high boost.  I saw timing levels in the low
single digits at high boost on the MC-2.  Now with my
stacked headgaskets, I'm usually -10 or more BTDC. 
Still not as good as a 20v will see, but much better
than -4 dbtdc.

Header=MC
No header=MC-2

That's how I'd look at it.

=====
Jim Green
'89 90tq
'89 80q
http://www.mswanson.com/~jgreen/car_home.html

__________________________________
Do you Yahoo!?
Yahoo! Mail SpamGuard - Read only the mail you want.
http://antispam.yahoo.com/tools