Port timing and port time-area are the 2 stroke equivalent of cams with more lift and larger valves on a 4 stroke.
A simple approach to improving performance is always to compare the motor in hand with another with better performance. Sometimes that reveals the futility of the dream, but is often a good source of information. I use Bimotion software to determine target time area and develop a starting point and then explore a range of possibilities in MOTA. Of course the software allows us to model ports that could not be machined without a lot of welding but that does help in understanding the limitations of a particular design.
A modern 2 stroke like say an Aprilia RS250 cup bike makes around 60hp at the rear wheel and with careful assembly can top 65BHP from 250cc. If we could scale that up we could get something spectacular.
Hold that thought.
Matoon 3 cylinder billet banshee cases with a triple cylinder CPI Cheetah or Serval top end would make enough hp to make your frame curl up and cry in the corner of the shed.
Take say a Polaris XCR800 and port it for 180 plus HP or an Arctic Cat triple and mate it to a modern 6 speed trans in a custom machine case and you could be looking at teh same HP as a MotoGP bike.
Those all have a lot more port area than any of our old triples and more potential to make power, but we all have a responsibility to make the most of what we have.......
A simple approach to improving performance is always to compare the motor in hand with another with better performance. Sometimes that reveals the futility of the dream, but is often a good source of information. I use Bimotion software to determine target time area and develop a starting point and then explore a range of possibilities in MOTA. Of course the software allows us to model ports that could not be machined without a lot of welding but that does help in understanding the limitations of a particular design.
A modern 2 stroke like say an Aprilia RS250 cup bike makes around 60hp at the rear wheel and with careful assembly can top 65BHP from 250cc. If we could scale that up we could get something spectacular.
Hold that thought.
Matoon 3 cylinder billet banshee cases with a triple cylinder CPI Cheetah or Serval top end would make enough hp to make your frame curl up and cry in the corner of the shed.
Take say a Polaris XCR800 and port it for 180 plus HP or an Arctic Cat triple and mate it to a modern 6 speed trans in a custom machine case and you could be looking at teh same HP as a MotoGP bike.
Those all have a lot more port area than any of our old triples and more potential to make power, but we all have a responsibility to make the most of what we have.......