Difference in MC-1 & MC-2 engines?

[Mihnea Cotet]

At 08:29 16/04/2002 -0400, Eric_R_Kissell at email.whirlpool.com wrote:
>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?

Nope! It's in the pistons.

>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?

No because the head won't alter the CR! The cams are different but nothing
else AFAIK.


>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?

The cam profile, yes, the CR no.You might as well drop in the K24 from the
MC2 because it has a much better lower-end than your K26.

>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?

I think so....


HTH,


Mihnea