When you say the SEH cam can be improved - in what way? I like the torque but would like a higher power output, say 110kW (150 ish bhp?).
I have thought about a longer duration cam (272 to 280) which is about as far as I'd go at our altitude of 1500m. The guys at the coast run 300's on std ECU.
Have you played with split cams - 272 inlet and 276 etc exhaust?
BTW: Our ASTRA Mk3's came as late as '99 with the SEH lump and I know there is some local (south african) development as the ecu flash codes are slightly different. We also have a MK4 fuse box + aldl socket.
Sorry for bumping an old thread, but i thought i shouldn't start a new thread for a problem that has been discussed already. I own a Kadett E GSi (Opel's version of Vauxhall Astra E GTE) running 140+ BHP (NE block with SEH pistons&cam, chipped ECU, 6800rpm rev limit) and here's what i'm planning to do:
- upto 5bar injection sistem (7bar Bosch injection pump + adjustable regulator) - i'm not sure the standard NE/SEH injectors still work at that pressure
- Lexmaul RAM Air Induction + 2.5/3.0 TB - toghether with the cam it'll probably kill the best thing about this engine: bottom end torque. Not complaining though
- 18E head - this idea i've picked up here; the 18E head has better airflow, but will it fit & work correctly on the 2.0 block? The 18E engine has 84.8 bore while the 20NE/SEH has 86, so i'm guessing the firing chamber is also smaller >> higher compression ratio. By my calculations it should be about 10.6:1, good enough for a high rpm NA engine, need a confirmation though. Also i'm wondering if the head gasket will get pinched every 500Km because of the 0.6mm edge created between the block and the head.