[xj_man_646]

Interesting stuff. This might be one of the more in-depth dives into 12v 'tuning' I've seen, especially on the rotary pump engines.

For the p-pump engine, have you considered one of those adjustable fuel plates, so you can dial up the fuel when you want power but can dial it down to reduce smoke and gain fuel efficiency? I can't recall who makes them but it basically slides back and forth with an adjustment knob of some sort.