Abstract: A valve actuation system comprises a first arm having a first arm contact surface and operatively connected to a valve actuation motion. A second arm having a second arm contact surface is operatively connected to the at least one engine valve. A discrete lost motion device is provided that is controllable between a first, motion conveying state and a second, motion absorbing state. The discrete lost motion devices comprises a plunger contact surface and a housing contact surface. The housing contact surface is configured to engage one of the first or second arm contact surfaces, and the plunger contact surface is configured to engage another of the first and the second arm contact surfaces. The first and second arm contact surfaces, the housing contact surface and the first plunger contact surface are configured to support the discrete lost motion device between the first arm and the second arm.

Abstract: In a fireplace unit having an open sided firebox formed by opposed side walls, a top wall, a bottom wall, a rear wall, and a connection in the top wall to an exhaust flue, the present improvement including an intermediate wall member of overall curved configuration mounted in the firebox opening, the intermediate wall member being spaced from the rear wall of the firebox and extending between the opposed side walls and, at least, the bottom wall thereof to define a substantially enclosed space in the firebox opening therebehind, the curved configuration of the intermediate wall member increasing the reflective and radiant characteristics of the interior of the firebox thereby improving its overall efficiency and heat transfer capabilities. The various embodiments of the intermediate wall member disclosed herein may be attached to the firebox by fasteners, by welding, or by other suitable arrangements, or such intermediate wall member may be integrally formed as part of the firebox itself.