Displacement on demand

[Libor]

Originally Posted by NoDOHC

I don't run 14.7:1 while cruising, I run 16.2:1. I am running about 60 degrees of advance while cruising at -45kPA. You have to light the lean mix a lot earlier as it burns more slowly.

How is the driveability with such lean mixture?

There is interesting discussion over rx8club about negative split and lean burn during cruising but concensus backed by injector duty and actual gas mileage is, that best gas mileage, driveability and overal responsiveness is best with slightly rich mixture 0.92 - 0.93 Lambda. And this is with high CR, no overlap engine.

I agree with you that conventional rotary engine very same like piston engine has highest thermal efficiency at around 1.15 Lambda? But this is measured at WOT and practical parameters mentioned above aren´t investigated.

You should try it