...BTW your Bieber avatar is awesome.-Malone
but ive heard of people running tdi cams? any benifit of running a tdi performance cam?
I am pretty certain the Dr. Diesel camshaft is the best you can get for the 4 cylinder Volkswagen IDI.250 horsepower, crank or wheel? Steep goals either way I cannot for the life of me remember what his username was, but he was a serious/heavy builder of these 1.6 engines and the most he managed was 195 BHP with one done to the nines.You are correct in the thoughts of cramming air in, but as far as I am aware the 1.9 head is pretty damn optimal as-is maybe some port work needed.. Get a really efficient turbo, and an Air-to-Water intercooler with an extremely efficient setup so you will experience less than 0.1% of pressure drop through it and it will be able to cool to ambient temps. This will allow you to run as much boost as whatever turbo you decide to run will run efficiently.. This is where the real power is, lotsa fuel, and lotsa cold air.
Bigger exhaust valves would definitely help. Just be careful of the porting as there are coolant passages close to the exhaust ports near the manifold end.
IIRC one of the crazy Scandinavian guys: Aki76, I'm blanking on the other names to look up, had an IDI head with huge valves in it, it looked like the intake and exhaust valves practically touched one another. Might be worth searching and digging through some old threads.
As for the porting, I know gas motors you are supposed to leave the intake a little rough and not polish that one, only the exhaust side. Does this not apply to diesels? Polished would help air get in fast. And 7mm stems on a 1.9 head?