Posted by Owen Aaland on July 24, 2010 at 21:57:42 from (198.70.47.148):
In Reply to: gasoline octane.. posted by 53 SuperM on July 24, 2010 at 12:15:57:
mike paulson said: (quoted from post at 15:15:57 07/24/10) i have been hearing some guy's saying the older equipment should use the higher octane gas, is there any reasoning behind that?
years ago guy's used lead additives in their hotrods when leaded gas was no longer available, does anyone ad lead?
The lead additives are lead substitutes, not actually lead. The reason for their introduction was not to raise the octane rating, as the tetraethyl lead was used for, but rather to act as a lubricant for the valve seats and faces.
By the time the tetraethyl lead was introduced, most engine design had progressed to the point where it's benefits for valve lubrication was minor. Early engines, mostly built before WWII, had valve seats that were just machines spots in the cast iron. These seats worn quite quickly, especially if valve rotators were added to help break up carbon deposits on the mating surfaces. The tetraethyl lead proved to be of some benefit for extending valve life in those engines.
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