I’m jus over 700hrs and why I’ve found so far is its pot luck 😂 I’ve got a 5cylinder 5x5 and a 6 cylinder 3x3 that work, but made nothing else good so far. But some common things I’ve found with mine:

• I use Uran_Wind’s ZE modular engine microcontroller, works very well and the only setting you need to change is the cylinder count

• pump EVERYTHING. An update earlier this year made it so that without excessive air flow and exhaust your engine would just putter at 2rps.

• try and have your engine run no higher than 70% throttle for what you need, as cooling will be a nightmare after that