Abstract: A pre-combustion chamber for an engine is made more simply removable from the cylinder head by integrating the chamber design and not threading the assembly to the head. The assembly is provided as an integrated design using a seal that helps dissipate heat from the spark plug and a cover that is held down by flange bolts that extend into threaded bores into the head in a location more removed from the heat generated in the chamber. As a result the chamber is more simply installed and removed without damage to the head.

Abstract: An impact resistant tilt window assembly includes a window frame with side jambs that have legs that extend in the direction of the exterior of the frame, an upper sash, a lower sash that moves vertically and tilts inwardly and tilt latch assemblies that are positioned on the lower sash, each tilt latch assembly includes a latch bolt with a nose end that includes a notch that is sized to engage the associated jamb leg when the lower sash is in a vertical orientation. The notch has an interior leg that moves along an interior side of the jamb leg and an exterior leg that extends behind an exterior side of the jamb leg and moves along the jamb leg when the sash moves vertically. The window assembly may further include U-shaped reinforcing inserts that are positioned within the jambs such that the tilt latch assemblies engage the inserts when the lower sash is in the closed position.