Abstract: An engine or other machine has an improved configuration for a connecting rod a wrist pin cradled and fastened on a saddle of the rod. The improved configuration allows fluid flow through the rod to the interior of the wrist pin while reducing the tendency for cracks in the saddle. The configuration includes a fastener which has a through bore and which extends from a void in the rod to the interior of the wrist pin. The fastener fits closely with holes in the wrist pin and the saddle, and a nut fixed in the wrist pin threads with the fastener, whereby the nut and fastener prevent relative motion between the wrist pin and the saddle. The saddle has only one aperture, so the saddle is stronger than prior designs.

Abstract: A piston for a high performance engine has a crown and a skirt integrally formed with the crown. A step is defined about the crown and an annular channel is machined in the step. A ring belt facially encircling the crown sealingly covers the annular channel so as to form an enclosed passageway where the coolant circulates. The piston has passages by which coolant under pressure is sent to the crown. The crown has a coolant entry duct communicating the passages to the annular channel and has a coolant exit duct communicating the annular channel with a cavity in the skirt.

Abstract: A magnetic amplifier housing uses a base, dowel and shunt to magnetizable terial to concentrate the magnetic field of a ring magnet through a Hall Effect transistor to provide an improved detector device with increased gain. The detector device causes polarity reversal when tampered with, ensures positive mechanical alignment of the transistor and mechanical components, and protection of the transistor from mechanical damage.