Re: Gasoline: Leaded or Unleaded ??

Posted by Dave Wis on September 09, 2004 at 00:40:46 from (136.1.1.33):

In Reply to: Gasoline: Leaded or Unleaded ?? posted by Bob T on September 08, 2004 at 19:11:16:

Just a couple of comments. Tetraethel lead was added for a couple reasons. It was initially developed to reduce the speed of flame travel during combustion which allowed for higher compression. It also cushioned the valve to seat contact area. Without it nonhardened seats wear much faster, however as stated for engines that are not run for hours daily it will take awhile to cause a problem. Contrary to some folks thinking higher octane gas does not, by itself, increase power. It allows us to do things to the engine that do produce more power, primarily increase compression and advance the timing. In fact we have found, on the dyno, that too high of octane for a given engine configuration will actually reduce power because it slows the burn rate too much. BTW Mr Kettering learned almost from the start that tetraethel lead was a deadly toxin but even then corporate profits were more important than peoples lives. Sound familiar?

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