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Old 05-02-2000, 12:39 PM
Oblio Oblio is offline
Join Date: Jun 1999
Posts: 434
Aviation fuel

Lead is still required in most IC aircraft engines. Even engines with supplemental type certificates (STC) to run on unleaded auto fuel must use leaded aviation fuel for break in. I believe this is due to the valve train design and materials (seats, stems,guides) being stuck in the 1940's.

I plan on running leaded fuel in my aircraft for the first 100 hours, and then mix 50/50 with auto fuel after that to reduce plug fouling but still retain lubrication.

There is a new gas formulation coming out with reduced lead for use in engines that previously used the lower lead (80/87) fuel that is no longer available.
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