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Originally Posted by Old Tele man
Can not speak for others, but I've had to replace valve seats in early Plymouth/Dodge 318 engines because the valves pounded themselves into the heat/seat...and personally know of similar problems happening with early Ford 6-cylinder engines...and, was TOLD (I know, 2nd hand) of similar problems with GM products.
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And no one ever had to replace valve seats &c before the introduction of unleaded gas? I have to call BS on this: you are blaming unleaded gas for the automakers' poor design & manufacturing quality.
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Moreover, the private pilots were/are totally afraid of valve problems, hence their delayed transition to Low-LEAD (and NO-lead!) gasoline even now.
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Wrong again. First, a lot of us do run our planes on autogas. I added an autogas STC to my Piper Cherokee back around 1990, flew it for two decades without problems, and when I sold it last year, the AP who did the inspection for the buyer said it was in fine shape.
The reason some people objected to low/no lead avgas (other than unthinking anti-environmentalism) was the few very high compression engines that require 100 to 130 octane.