The Griffon 61 series introduced a two-stage supercharger and other design changes: the pressure oil pumps were now housed internally within the sump and an effort was made to remove as many external pipes as possible.[11] In addition, the drive for the supercharger was taken from the crankshaft at the back of the engine, via a short torsion shaft, rather than from the front of the engine, using a long drive shaft as used by earlier Griffon variants.[8]