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Jet fuel contamination, detection
The FAA grounded most airplanes on our airport for fuel contamination after
Chevron sold Avgas tainted with Jet fuel. Most pilots did not detect the
contaminated gas. Since we had large amounts of it on the airport, I had
an opportunity to try a quick and sensitive method of detecting jet contamination
of avgas. The concentrations were large enough to do engine damage but
small enough that you couldn't smell the kerosene in the fuel. The best
method I found was to stick my finger in the fuel and wait 30 seconds for
the gasoline to evaporate. I could then smell the Jet fuel that was still
on my finger after the gasoline evaporated. If you don't like fuel additives
absorbing through your skin then wait 30 seconds or so after draining your
fuel sampler and then smell it. You might also look for an oil film on
your finger nail after the gasoline has evaporated.
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Preignition damage to top of piston from continental engine.Cause: Jet fuel mixed into aviation gasoline lowered fuel octane Swirl markings on top of piston are normal combustion pattern markings. They show how the hemispherical (dome shaped) cylinder head and the induction system swirls the mixture for better mixing and burning.
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