Head work for 4KQT (extended w/more Q's)

[Arryn Milne]

Some questions tumbling around in my head:
1. Are there any sodium filled valves bigger than 33mm (say35-36mm) that'll 
fit the MC engine?
2. If yes, will these fit along side 40mm intake valves (have to ask).
I've heard that in turbo'd engines, it's a good idea to increase exhaust 
valve size to increase exhaust efficiency (and I suppose turbo efficiency).
3. What engines were used in the non-US 200, and in what years?  1B?  What 
about before the 1B (KY?, KG?)?
4. Besides compression, does anyone know what changes Audi made to up HP 
from the MC's 160, to 180-200?  Camshaft maybe?
5. Am I right to assume that putting pistons in from a car with 8.4:1 
compression (from what I'll call the MC-II - US 200) will affect the 
combustion chamber acoustics, and therefore knock regulation?
6. Would putting the knock sensor from the same donor cure that little problem?

I have a spare 1987 MC engine that I was going to rework in preparation for 
the day the clutch goes.  I was thinking a little cylinder head work, 
higher compression (via new pistons rather than head skimming), and perhaps 
a cam.  I guess I'm after a good honest 250hp, so 275 might be a good 
goal.  Problem is, I don't want to increase turbolag any further.

Comments welcome.
Thanks,
Arryn


At 10:08 PM 9/26/00 -0400, JShadzi at aol.com wrote:
>In a message dated 9/26/00 4:48:44 PM Pacific Daylight Time,
>auditude at neta.com writes:
>
><< So, just the exhaust valves are sodium filled on the MC heads?  I
>  had thought before that it was "sodium filled valves", not limited to
>  the exhaust ones only.
>   >>
>
>     Yes, only the exh. are sodium filled as they have to pass the very hot
>combustion gasses past the entire valve and most of the stem...the intakes
>are standard steel w/o soduim.
>Javad