A four stroke internal combustion engine comprising at least one cylinder arrangement, a crankshaft, and a camshaft, wherein the at least one cylinder arrangement forms a combustion chamber and comprises a cylinder bore, a piston arranged to reciprocate in the cylinder bore, a connecting rod connecting the piston with the crankshaft, and an exhaust arrangement for outflow of exhaust gas from the cylinder bore, wherein the cylinder arrangement has a maximum volume, V MAX, between a bottom dead centre, BDC, of the piston and an upper inner delimiting surface of the combustion chamber, wherein the exhaust arrangement comprises an exhaust valve and an exhaust opening, the exhaust valve comprising a valve head configured to seal against a valve seat of the exhaust opening, wherein the camshaft comprises a lobe configured to cause a motion of the valve head for opening and closing the exhaust opening, wherein and wherein the exhaust arrangement comprises a linkage arrangement configured to change the motion of the valve head caused by the lobe, the camshaft is synchronised with the crankshaft to rotate at a same rotational speed as the crankshaft, wherein the linkage arrangement is configured to prevent the motion of the valve head every alternate rotation of the camshaft, such that the exhaust opening remains closed during a compression stroke of the piston characterised in that the four stroke internal combustion engine comprises a turbine and an exhaust conduit extending from the exhaust opening to an inlet of the turbine, wherein the inlet of the turbine has a turbine inlet area, A TIN, and wherein the exhaust conduit has an exhaust conduit volume, V EXH, ≤ 0.5 times the maximum volume, V MAX. the at least one cylinder arrangement forms a combustion chamber and comprises a cylinder bore, a piston arranged to reciprocate in the cylinder bore, a connecting rod connecting the piston with the crankshaft, and an exhaust arrangement for outflow of exhaust gas from the cylinder bore, wherein the cylinder arrangement has a maximum volume, V MAX, between a bottom dead centre, BDC, of the piston and an upper inner delimiting surface of the combustion chamber, wherein the exhaust arrangement comprises an exhaust valve and an exhaust opening, the exhaust valve comprising a valve head configured to seal against a valve seat of the exhaust opening, wherein the camshaft comprises a lobe configured to cause a motion of the valve head for opening and closing the exhaust opening, wherein and wherein the exhaust arrangement comprises a linkage arrangement configured to change the motion of the valve head caused by the lobe, the camshaft is synchronised with the crankshaft to rotate at a same rotational speed as the crankshaft, wherein the linkage arrangement is configured to prevent the motion of the valve head every alternate rotation of the camshaft, such that the exhaust opening remains closed during a compression stroke of the piston characterised in that the four stroke internal combustion engine comprises a turbine and an exhaust conduit extending from the exhaust opening to an inlet of the turbine, wherein the inlet of the turbine has a turbine inlet area, A TIN, and wherein the exhaust conduit has an exhaust conduit volume, V EXH, ≤ 0.5 times the maximum volume, V MAX.