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Leaderboard

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In page Tetraethyllead:

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Vehicles designed and built to run on leaded fuel often require modification to run on unleaded gasoline. These modifications fall into two categories: those required for physical compatibility with unleaded fuel, and those performed to compensate for the relatively low octane of early unleaded fuels. Physical compatibility requires the installation of hardened exhaust valves and seats, or by use of additives. Compatibility with reduced octane was addressed by reducing compression, generally by installing thicker cylinder head gaskets and/or rebuilding the engine with compression-reducing pistons (although modern high-octane unleaded gasoline has eliminated the need to decrease compression ratios[citation needed]), and/or by retarding ignition timing.