Difference in MC-1 & MC-2 engines?

[JShadzi at aol.com]

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[ Picked text/plain from multipart/alternative ]
The compression difference is in the pistons, not the head, the heads are
about identical.  Realistically you could get by with an MC-2 bottom end in
your MC-1, some would argue that the timing maps would be all off, I've BTDT
with no problems, just run higher octane fuel, the ignition systems in both
those cars are very good.

HTH,
Javad

In a message dated 4/16/2002 6:44:19 AM Pacific Daylight Time,
Eric_R_Kissell at email.whirlpool.com writes:

>
> List members,
>
> Is the compression ratio difference between the MC-1 (7.8:1) and the MC-2
> (8.4:1) all in the heads?
>
> I know that the 8.4:1 MC-2 uses two knock sensors and was used in the late
> 1989 and 1990 Audi 200's while the earlier 7.8:1 MC-1 uses one knock sensor
> and was used in the 1986 through early 1989 200's (i.e. 5000 turbo through
> 1988).
>
> Would I get into any trouble running the 8.4:1 MC-2 head on the earlier
> single knock sensor MC-1 block? Do I really need two knock sensors to
> manage 8.4:1?
>
> I want to run this with a QLCC modified computer and 1.8 bar setup. I can
> get the head inexpensively and I think the higher compression ratio and
> revised cam profiles might be an improvement. Any comments?
>
> I assume I can bolt the head from an MC-2 directly onto an MC-1 block
> without any problems. The only thing I can think that might need to change
> is the timing belt gear on the camshaft. Is everything else the same?
>
> Thanks in advance,
>
> Eric R. Kissell
> 1986 5000cstq, 1.4 bar, K24, Bilsteins
> 1989 200q Avant, 1.8 bar (SJM), K24, Fuchs
> 1987 VW GTI 16V, 1984cc, Bilsteins