I was looking through the Detroit Diesel site the other day and they have some interesting yet quite simple ideas on how they make there huge engines create all that power (up to
10 000hp).
Apart from formula 1, most new ideas for engine technology come from industrial engines. Earthmoving equipment manufacturers are masters of coming up with new and inovative ideas
to solve problems or make the machines more efficient.

I would recommend having a read of some of their info. You guys with a half modern engine may be able to apply some of their ideas to your engines.