New GA all motor K series record

[Moseley]

Incorrect. Mazda, and every racing organization classify them as 1.1 L for 12a's an 1.3L for 13b's. Don't you think that racing organizations would have declared them as 2.6L's if they were? It is 1.3L per revolution of the eccentric shaft (it's crank). That is why they are usually grouped in the 6 cyl class - 6 faces firing in one revolution. Displacement is 3√3radius·offset·depth, multiplied with the number of rotors (note that this only counts a single face of each rotor as the entire rotor's displacement).
Now, why would you compare them to a 4 stroke? 4 stroke motors need 2 revolutions of the crank to complete a cycle. Rotaries do not have to make multiple strokes for the 4 phases of a combustion engine - they do it in one efficient stroke.

Well even if it only displaces 1.3L per revolution it is also igniting 1.3L, compared to a 1.3L 4 stroke which ignites 650cc per revolution.

So technically a rotary, if compared to a piston engine displacement wise, should be compared to a 2 stroke.

I guess that is what I was getting at...

[David88vert]

Well even if it only displaces 1.3L per revolution it is also igniting 1.3L, compared to a 1.3L 4 stroke which ignites 650cc per revolution.

So technically a rotary, if compared to a piston engine displacement wise, should be compared to a 2 stroke.

I guess that is what I was getting at...

But it isn't a 2 stroke or a 4 stroke, so that is comparing apples to oranges. I understand what you are attempting to say, but the fact is that the rotary is just a completely different engine that doesn't fit into the same limitations. It also has it's own set of issues, due to design, that do not plague 4 stroke engines.
There is no such thing as fuel efficiency when you discuss a rotary. You simply determine if you make enough money to pay for the fuel that it will consume - then you go get a second job.
Bringing up the rotary was just to make a point in the hp/liter discussion. And that only came up due to 1civic thinking that 100hp/liter was some sort of performance figure. Last I checked, hp/liter does not directly translate into track times, either on the road course or the dragstrip.