Axial Engines ... the future??
Duke Engines - YouTube
This thing looks pretty nifty. It's sort of like a glorified swashplate and rotary.
Looks to be fairly efficient, with decent power.
The 3.0L version was able to produce 215 hp @ 4500 and 250 lb ft @ 4500.
The main issues with this engine type are emissions (more like a 2 stroke or rotary) and friction (thus low max rpm and power output). Also, reliability is questionable.
Once these are resolved, I could see the engine type powering some little eco car on CNG or LPG.
Multi Fuel, Low Vibration, High Power Density, 5 Cylinder
99 Chevrolet Camaro Z28 M6 - 6.676 @ 103 in 1/8, 10.512 @ 130.2 on street tires, H/C/I
93 Eagle Talon TSI AWD 5spd - Built 6 Bolt, 16G Evo3, HKS 272 Cams - under construction
94 Mustang GT - 5.0 bored and stroked to 347, Vortech V1 @ 10 PSI, Tremec TKO 600 - PIA