Abstract: The improved clutch of the present invention includes a fluid actuated piston in the pressure plate assembly which may selectively and gradually be moved into and out of position to engage and disengaege the clutch plate between the pressure plate assembly and the flywheel. The improved clutch also includes a fluid actuator circuit to control the selective and gradual engagement of the clutch assembly.

Abstract: A valve spring compressor apparatus for removing and installing valve springs on automotive racing engines includes a valve seat and a compressor pump assembly. The valve seat is placed between the valve spring and the engine housing. The compressor engages the valve spring seat with a support arm and extends a piston toward the valve spring seat, thus compressing the valve spring and allowing for the removal of the retainer ring and keeper lock. The compressor uses a source of compressed air to drive a power piston into a compression chamber multiplying the supply air pressure several times. This multiplied air pressure is retained in the extension piston chamber by a one-way valve. As the extension piston extends, the multiplied air pressure in the extension piston is maintained by repeated cycling of the compressor.