Abstract: An intake and exhaust tuning system is disclosed. The exhaust system includes a collector slidably mounted within the exhaust fluid path and adjustable by an actuator to change the fluid path length between the collector and the exhaust ports of an engine. The intake tuning system includes a sliding member engaging parallel straight sections of tubes forming the intake system. The position of the sliding member is adjusted to change the length of the intake fluid path. Sealing members suitable for use in the intake and exhaust tuning systems are also disclosed.

Abstract: An intake and exhaust tuning system is disclosed. The exhaust system includes a collector slidably mounted within the exhaust fluid path and adjustable by an actuator to change the fluid path length between the collector and the exhaust ports of an engine. The intake tuning system includes a sliding member engaging parallel straight sections of tubes forming the intake system. The position of the sliding member is adjusted to change the length of the intake fluid path. Sealing members suitable for use in the intake and exhaust tuning systems are also disclosed.

Abstract: An improved piston ring suitable for use in an internal combustion engine is disclosed comprising a plurality of races sized to receive elongate rollers disposed around the circumference thereof. The elongate rollers may be shaped as a prolate ellipsoid or other rounded shape. The piston ring may seat within a groove in fluid communication with an oil channel extending through a piston rod and opening into a rod bearing connecting the piston rod to a crankshaft. A crankshaft has a corresponding oil channel therewith and has an opening positioned to periodically align with the opening in the rod bearing when rotated. Oil is pumped into the oil channel in the crankshaft to force oil over the piston rings. Drain apertures may be formed in another groove formed in the piston to conduct oil away from the piston.

Abstract: A canopy for covering the bed of a pickup truck having a rigid frame covered by a flexible shell. The frame includes a plurality of elongated, spaced apart side supports extending between the sides of the truck adjacent the bed and a roof support. The roof support includes a plurality of transverse, 1elongated roof members spaced apart by the same distance as the side supports, and a substantially rigid sheet of plywood or similar material fastened across the top of the roof members. A flexible shell having a top and sides is then placed over the side and roof supports, and the lower edges of the shell are secured to the truck sidewalls thereby snugly positioning the shell around the side and roof frames. The side supports are pivotally secured to the roof members so that after the shell has been removed from the frame and the frame has been removed from the truck the sides may be folded inwardly and the shell may be folded compactly for storage of the canopy support.