| 摘要 |
The invention in a snow mobile engine head is formed, as by milling methods, from an aluminum billet and includes spaced bolt bosses extending at spaced intervals from around the head perimeter, each of which bolt bosses includes a hole formed therethrough to receive a bolt that is turned into an engine block, mounting the head. The head includes a firing chamber formed therein in opposition to a piston chamber formed in the engine block, for containing a piston having a crown top surface with a junction of an outer edge of the firing chamber and an edge of an inner wall of a head squish band radiused to provide a curved surface thereat that will encourage a circular flow of an air fuel mixture towards the head firing chamber center to provide for improved exhaust gas acceleration away from the piston outer perimeter, aiding in the eliminate detonation. The head bolt bosses each include a stepped section formed in the ends thereof for registering to, and receiving head openings of a water distribution plate fitted thereto, which head includes a center plug seat formed through the head crown that is thread to receive a spark plug. A resilient high temperature O-ring seal is fitted to the plug seat for sealing in a plug hole that is formed through an engine cover, and each head top surface is preferably formed with radially stepped surfaces to essentially double the head surface area for increasing cooling efficiency.
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