08-11-2004, 11:19 PM
NOW we're talkin. :wink: Thanks! Narrow power band eh? Yeah, obviously those large engines stick with a fairly constant RPM, which I figured was mostly attributed to their extreme size (I'm sure accelerating/decelerating that crank and other rotating mass is a BITCH), but I have to ask, why does the tech lead to such a narrow band? Assuming you could make a small one that made max power at say, 4 grand, why would power fall off so rapidly at anything but that? Seems like fuel injection timing is adjustable (computer controlled, retarded/advanced with RPM), the amount of air entering the chamber can be controlled, I wasn't sure what actually drove the exhaust valve(s), but couldn't that be adjustable as well? 2-stroke diesel V-tek? 8) Is there something static (the cyl/piston size, compression ratio, valve size) that dictates a certian RPM in this case?