of this invention requires only outlet slots 1 in the bottom portion of the cylinder wall it is clearly evident that the exhaust slots 1 of the invention can be made substantially of twice the cross sectional area of that of common two stroke engines consequently in the engine of the invention it is substantially possible to exit twice as much burned gases as in the common two stroke engine the outlet slots 1 may be set in inclined angles as shown in fig3 in order to have a good guide for the piston rings so that the piston rings will not break when they move during piston stroke over the outlet slots 1 of the invention according to the here described perferred embodiment of the figures of the invention the exhaust port 8 is connected to a gas motor or to a turbocharger turbine unit for example to entrance port 70 of fig1 the gas motor or turbine 71 drives a loader 69 which sucks in air or air fuel mixture through entrance port 66 and supplies it as a compressed air or compressed mixture out of exit port 69 into entrance port 84 of the engine instead of sending the exhoust gases through the gas motor or turbine 71 the exhaust gases can also be send through a muffler out into the atmosphere in such case however a compressing unit or loader must be driven by other.