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Because they were designed for leaded gas and you can't just modify certified aviation stuff without spending millions on the process of getting your modificati
by throwaway0a5e 5y ago
Because they were designed for leaded gas and you can't just modify certified aviation stuff without spending millions on the process of getting your modification approved.
- MaxBarraclough 5y agoI think it's more that most aviation piston engines were originally approved for use with leaded fuel, and things have been slow to change. At least some of them apparently run fine on the right unleaded fuel. https://en.wikipedia.org/wiki/Avgas#UL94_(formerly_94UL) https://en.wikipedia.org/wiki/Avgas#UL94_(formerly_94UL)