This is the kind of useful information that I was looking for. I understand completely what you are speaking of.
In laymans terms to make 500hp at 2600RPM it take x cylinder pressure
if you want 600hp and you try and make it at the same rpm the cylinder pressure has to increase by a certain amount, im sure i could do some math to figure it out but its friday morning and i really don't feel like it.
so if you take the 600hp figure and move it to say 3400 rpm, then the cylinder pressure at 2600 becomes less than it was at 500hp.
as i have stated before RPM = HP, its simple math...
rods are cycled, compression and extention, on most gas engines that break rods the rod bolts actually stretch too far and the bearing begins to sease on the journal resulting in a spun bearing and then the rod breaks, to counteract this process you have to upgrade the rod bolts, or you have to reduce overall piston, wrist pin, and small end of rod weight, or a combonation of the two, because of the exhaust stroke on a rod there is not nearly as much pressure on the rod and the rod stretches,
if you ever mock up an engine put a bearing in the rod and torque the rod with the rod off of the crankshaft, when you check the bearing it isn't a perfect circle, its wider where the cross section of the rod is, that is a design to keep the bearing from catching on the crank when the bolts stretch.
So if we were to get custom pistons made... I have priced them from the custom piston manufacturers, and they were reasonable, and have them lightened in the correct areas without sacrificing strength, one could easily subject one of these engines to higher rpm without the worry of destruction