Improved version of www.youtube.com mechanism. Ideal gas manipulation at constant volume heat removal = it is really constant volume and PV-plot has sharp - corners. Phase shift is 4pi/5 = 144deg. Piston stay half of that (72 deg) in top dead center, Ithe engine ran for more than two minute with residue heat. You can see the ethanol heater is just the beginning of video. Nokia cellphone video quality is poor, i'm sorry.