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Tree Care Forums
Arborist 101
Racing/High Octane/Aviation Fuel in Chainsaws?
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<blockquote data-quote="VA-Sawyer" data-source="post: 4764033" data-attributes="member: 7005"><p>People think that the lead lubricated the valves, that isn't quite how it worked. The TEL deposits acted as a coating that kept the valve from welding to the seat every time it closed. When the TEL was removed, the valve would form a miniature weld with the seat. When the cam opened the valve the next time, that weld would tear, leaving a divot on the seat. Over time, the seats would have a very rough surface all the way around. The fix for that was hardened seats. They were made of materials that resisted the welding effect.</p></blockquote><p></p>
[QUOTE="VA-Sawyer, post: 4764033, member: 7005"] People think that the lead lubricated the valves, that isn't quite how it worked. The TEL deposits acted as a coating that kept the valve from welding to the seat every time it closed. When the TEL was removed, the valve would form a miniature weld with the seat. When the cam opened the valve the next time, that weld would tear, leaving a divot on the seat. Over time, the seats would have a very rough surface all the way around. The fix for that was hardened seats. They were made of materials that resisted the welding effect. [/QUOTE]
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