MC-1 MC-2 - Block any difference?

[JShadzi at aol.com]

I agree with Jim on the 15psi, I'd say up to 300 crank HP you're fine with the MC2 and street gas, but above that range the MC2 gets very sensitive aobut ignition timing, and the MC1 is a much better motor to tune.  Now throw in some 100 octane in the picture and the MC2 is perfect.

Javad

>
>--- 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
>
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