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 . <EOS>