A variable camshaft timing phaser for an internal combustion engine having at least one camshaft comprising: a housing having an outer circumference for accepting drive force; a rotor for connection to a camshaft coaxially located within the housing, the housing and the rotor defining a plurality of vanes separating a chamber in the housing into an advance chamber and a retard chamber wherein the plurality of vanes are controlled by flow between the advance chamber and the retard chamber; wherein at least one of the vanes is a cam torque actuated vane and defines an advance and retard chamber (17b, 17a) and at least one other vane is oil pressure actuated and defines at least one other advance chamber; a spool valve located along a rotational axis of the phaser and coupled to a source of oil pressure and the advance chamber and the retard chamber; the variable camshaft timing phaser characterized in that: the spool valve coupled to at least one other advance chamber defined by the oil pressure actuated vane; the spool valve having a position wherein fluid is routed from the retard chamber defined by the cam torque actuated vane through a first check valve to the advance chamber defined by the cam torque actuated vane, wherein fluid is prevented from flowing in an opposite direction by the first check valve and fluid is routed from a supply of oil to the other advance chamber of the oil pressure actuated vane, moving the phaser towards an advance position; and the spool valve having another position wherein fluid is routed from the advance chamber defined by the cam torque actuated vane through a second check valve to the retard chamber defined by the cam torque actuated vane, moving the phaser towards a retard position, wherein fluid is prevented from flowing in an opposite direction by the second check valve. a housing having an outer circumference for accepting drive force; a rotor for connection to a camshaft coaxially located within the housing, the housing and the rotor defining a plurality of vanes separating a chamber in the housing into an advance chamber and a retard chamber wherein the plurality of vanes are controlled by flow between the advance chamber and the retard chamber; wherein at least one of the vanes is a cam torque actuated vane and defines an advance and retard chamber (17b, 17a) and at least one other vane is oil pressure actuated and defines at least one other advance chamber; a spool valve located along a rotational axis of the phaser and coupled to a source of oil pressure and the advance chamber and the retard chamber; the variable camshaft timing phaser characterized in that: the spool valve coupled to at least one other advance chamber defined by the oil pressure actuated vane; the spool valve having a position wherein fluid is routed from the retard chamber defined by the cam torque actuated vane through a first check valve to the advance chamber defined by the cam torque actuated vane, wherein fluid is prevented from flowing in an opposite direction by the first check valve and fluid is routed from a supply of oil to the other advance chamber of the oil pressure actuated vane, moving the phaser towards an advance position; and the spool valve having another position wherein fluid is routed from the advance chamber defined by the cam torque actuated vane through a second check valve to the retard chamber defined by the cam torque actuated vane, moving the phaser towards a retard position, wherein fluid is prevented from flowing in an opposite direction by the second check valve. the spool valve coupled to at least one other advance chamber defined by the oil pressure actuated vane; the spool valve having a position wherein fluid is routed from the retard chamber defined by the cam torque actuated vane through a first check valve to the advance chamber defined by the cam torque actuated vane, wherein fluid is prevented from flowing in an opposite direction by the first check valve and fluid is routed from a supply of oil to the other advance chamber of the oil pressure actuated vane, moving the phaser towards an advance position; and the spool valve having another position wherein fluid is routed from the advance chamber defined by the cam torque actuated vane through a second check valve to the retard chamber defined by the cam torque actuated vane, moving the phaser towards a retard position, wherein fluid is prevented from flowing in an opposite direction by the second check valve.