FactoryX,
How is designing an engine the way it has to be, to be competitive, CHEATING?
It's what you do as an engineer. A 4t has bugger all torque, when compared to a 2t with a comparable level of tune, so 4ts have always had to go the route of revs to get their HP. So be it. HP is a product of torque, multiplied by revs, then divided by a constant (5252).
TMKIWi has it right.
Now, tech like DFI may allow 2ts to get more mixture into the combustion chamber with a short stroke format (by replacing air charge lost by shorter stroke / shorter duration transfers and inlets) - it depends on the tech used for the pressure/ volume of the stratified charge. That's where the arguments put up against DFI being heavy / complex can come in - to get very high pressures / volumes of the stratified charge, for short stroke 2ts, is going to require tech / parts that will be far to bulky for dirt bikes, at least for the foreseeable future. The DFI outboards seem to have gone to over square dimensions, and bigger capacity engines, ironically - part of the weight benefit of 2ts , you can use a bigger engine, when you are dealing with an Output oriented sport / market.
Let the 4ts rev their tits off - they just keep getting 'pipier and pipier' (11 / 12krpm 450s, hitting the rev limiter constantly - I never thought I'd witness that).
Mind you, Moto 3's regulations, limiting revs to 13,000 (lower than most std 250f MXers rev to) rpm will, keep things in hand - the customer spec Honda 250 is claimed to have 35.5 KW = 47.6 HP, that shows what is still to come with 4ts, without mind blowing revs. They are allowed to use 81mm pistons, yet Honda has gone only to 78, as with the rev limit set, they have seemed to believe that there's no need for the max. sized piston. And that HP level, Has to be produced at a noise level much lower than allowed at the GPs (115Db), for those bikes to be run at race tracks around the world. Check out the huge, under case uffler it has. The GP bikes, will probably have open , or near to it, pipes.
To make Moto 3 interesting, the homologated engines, are going to have to pump out 55 /65 HP, to get the speeds of the 125s. It will be interesting to see what is to come.
Though, it should have been a class that allowed 4ts And 2ts, with spec / cost controls - better still, it Should have been 125s, with spec / cost controls. That would have delivered low cost racing, much more effectively.