[Knuto]

Was able to model a 2-valve single cylinder today. The engine is just pumping air right now, will take care of combustion next time. Attached a plot of the results. Left is pressure in exhaust port, and the right shows pressure in inlet port as a function of crank angle. Its not very fast right now (59 seconds for 2 cycles) , but I will try to simplify it when everything is working. Maybe it will get a little faster then. For the moment I have 188 different variables and matrices spred over 900 lines of codes, so it starts to get tricky juggling them around.