I had planned to use the stock-like dished pistons of 7:1 compression ratio. I'm aiming for 350HP or so. While more would be fun, I don't want to be forced to build an expensive bottom end. I'll likely limit the RPM to 4800 or so. I had planned to airfoil the bolt bosses.
(Sidebar... In 1909 the various european aircraft manufacturers lambasted the Wright Flyer as crude because the interwing struts were not teardrop shaped. The Wrights, however, had not assumed that the teardrop shaped cross-section had inherently lower drag, but had performed windtunnel testing and learned that a 2:1 aspect ratio rectangle with rounded corners was actually more efficient as well as stronger.)
This engine is to used in a truck; a combination show and go vehicle. The usual usage will be just cruising, with the occasional blast to pass; some of the highway time may be pulling a trailer. I don't expect that much time will be spent at the upper end of the HP output scale.
I'm looking at 10 to 12 PSI of boost, limited by a wastegate. Since I've yet to think about a cam, I have no idea on intake closing timing. The engine will front a 700R4, which has lots of leverage for accelerating the truck, so I'd like to have the engine rev easily, but cruising implies steadystate torque will also be needed.
I've tenatively nominated the GT3582R as the most likely candidate at this point... Probably a .82 A/R exhaust. The engine parameters run right up the high effiency island of the map. It intuitively seems like too much turbo, but the smaller sizes all seem to put the engine parameters close to the stall region.
