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Lead Additive for gasoline B18B engine. 1800 1965

uid 4846's pic
posted by  JohnMc on  Wed Jul 2 04:45 CST 2003
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last visit: Thu Oct 23 07:42 CST 2014
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The general consensus seems to be that a head that was weaned off leaded fuel has a work-hardened face that will last very well indeed with no additives. Once that surface wears off (a normal valve job would do it immediately) it will wear down pretty rapidly. Also, high rpm use will also wear through that layer more quickly as well. The octane isn't (AFAIK) a factor in valve wear. Proper valve lash adjustment, however, is.

97 Octane might be overkill in a '65 1800S (10:1 CR). The manual may suggest that, but that was under a different measuring system (RON only). Today they use two different methods (RON + MON/2) which tends to drop the numbers slightly. A bit more accurate, but not quite on the same scale as RON only numbers. The 'old' 97 octane compares very well to modern 93 octane.






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