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by bombcar 1388 days ago
More importantly most aviation engines were designed in the 50-70s and need the lead to keep the valves happy.
4 comments
p_l 1388 days ago
Another issue is that replacements for TEL that were fine for cars had issues with high altitudes (and high ambient temperatures)
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NonNefarious 1388 days ago
It's about detonation; I don't think it's about the valves.
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bombcar 1387 days ago
The 100 octane is about detonation; the lead is about lubricant for the valves.
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NonNefarious 1385 days ago
Mmmm, not sure about that: https://generalaviationnews.com/2011/10/24/why-lead-reduces-...
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throwaway0a5e 1387 days ago
It's about the valves.

Plenty of 100+ octane unleaded fuels out there.

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jabl 1387 days ago
Post-WWI aviation engines overwhelmingly have hardened valves (and valve seats) which work fine with unleaded fuel.
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outworlder 1387 days ago
And the spark plugs unhappy?
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