[hightower99]

Originally Posted by revetec

Come on.....The engine data images you posted were forced induction. (I assume the 1st one was even though I can't find data on it, the BMEP was 150?)

Nope only the full map of the Mercedes-benz M271 is FI and it is supercharged (supercharging always decreases overall thermal efficiency). here is the wiki page for it:
Mercedes-Benz M271 engine - Wikipedia, the free encyclopedia

The other two engines are the R26B Le-Mans winning 4 rotor rotary engine (not FI, it is NA). As well as the venerable Jeep 6-230 Tornado engine (also NA).

Here is the wiki for the tornado: Jeep Tornado engine - Wikipedia, the free encyclopedia

Originally Posted by revetec

The first image you posted above - The R26B engine is a turbocharged quad rotor, rotary race engine. Post something that is normally aspirated and in production for consumer use for comparison.

It is not turbocharged it is Naturally Aspirated. Also I posted those pics as just a sample to show that most of the stuff I have is about WOT BSFC not part throttle.

Originally Posted by revetec

Note: The supercharged Mercedes engine's best BSFC was around 250g/kW-h. Our best was 17% better or 6.8% better in total efficiency at our peak and normally aspirated. Forced induction decreases the total percentage lost in pumping losses as apposed to power gains.

First superchargers always decrease the overall thermal efficiency Second the graph show a relatively large patch which is 250g/kWh at the boundary. Peak BSFC is about 240g/kWh (34.09% efficient or only alittle under the 34.52% you achieved running stoichiometric, a good bit less than your 38.59% which you achieved running lean).