jminahan:
I do not know of any stratified charge gasoline engines that remain stratified at WOT.
When I referred to the Atkinson cycle, I had in mind the P-V diagram rather than one of at least two complex crank and linkage configurations that Atkinson developed. (These of course are interesting in themselves and provide the answer to the trivia question "what single cylinder four stroke fires every crank revolution").
If we look at the typical idealized air cycle P-V diagram for an Otto cycle, with the peak pressure on the upper left, the exhaust appears on the lower right side as a vertical line where the pressure drops to atmosphere. The Atkinson cycle, instead of having the abrupt drop in cylinder pressure continues the pressure decrease (expansion) until it approaches atmosphic pressure.
It is this extended use of gas pressure after the Otto cycle exhaust valve normally opens that was described to me as the Atkinson CYCLE. If memeory serves, the Atkinson engine was developed in an effort to work around the Otto patent before said patent was eventually nullified.
The Curtis-Wright engine continues exhaust expansion in a turbine rather than by extension of the piston stroke. It nevertheless uses energy normally wasted in the Otto cycle.
Regarding the turbo or stratified charge engine question, I'm pretty sure you will see a real benefit from the turbo.
j2bprometheus:
The Sabre was a gasoline sleeve valve engine as you correctly note. The Nomad was a 2 stroke diesel. The reference link below suggests a BFSC of .345 lbs/hp-hr. for the Nomad #2.
It may be described in L.J.K. Setwright's book "The Power to Fly" or perhaps his "Some Unusual Engines" book. (Can't remember)