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While rotary engines have great hp/liter ratings, they lose out in fuel efficiency big time. Now, it seems to be common wisdom that the reason for the fuel inefficiency is due to the large SA:V ratio of the combustion chamber, since the rotor face is rather large, especially when compared to a...

Thanks for the info, do you happen to know his email address offhand as well?

To give you an idea of how badly the torque drops off: http://ka24development.com/file_images/import_tuner_dyno.jpg Keep in mind the engine redlines at 6900. That graph doesn't even go past 6000. http://www.pdm-racing.com/products/DOHC_stock.html...

Do you know any of the other specs on that engine, such as port sizes, borexstroke, displacement, etc?

Well, they have specific turbo cams, so the other cams are presumably for a naturally aspirated engine, but they may be assuming certain engine dynamics (a square or oversquare design, short intake manifold runners) out of habit of working on engines like that.

Well, I've been working with a Nissan KA24DE recently. 2.4L DOHC 4v/cyl 89x96 Inline 4, 9.5:1 compression ratio. Now, the undersquare aspect is a bit odd considering I'm trying to extract high-RPM power. The reason why I'm trying is that the engine redlines at 6900rpm stock, yet the stock...