Abstract: A door hinge unit comprises a first leaf attached to a door, a second leaf attached to a hinge pillar, a hinge pin adapted to be inserted into corresponding bores formed within the leaves of the hinge, a striker mounted to the second leaf, and a check arm mounted to the first leaf and urged into contact with the striker by means of an elastomeric element which preferably comprises a generally annular elastomeric component which may be mounted to a cylindrincal pedestal having an axial groove for accepting a shank of the check arm. The check arm may be furnished with a plurality of indentations allowing the hinge unit to be stopped in any one of several rotational positions of stable equilibrium.

Abstract: An arrangement for reduction of exhaust noise in an internal combustion engine comprising in a preferred embodiment a two-cycle diesel engine having two or more exhaust valves per cylinder and separate cam lobes for actuating two groups of one or more valves. The lobes are arranged to stagger the openings of the two valves or groups of valves and to close all valves in a cylinder at the same time. The gas flow area past the earliest opening valve during the period before the second valve opens is controlled to restrict exhaust gas flow, thus limiting the exhaust blowdown pulse and exhaust noise from that source. Preferably, the initial flow restriction is provided by seating the early opening valve heads in countersunk seats with a predetermined radial clearance around the head which acts to restrict the flow in the initial opening period.