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"dont[sic] tell me the classic ones with compress ratio any diy ideas to achive[sic] higher efficiency maybe..."
Classic: Perfect Circle piston rings
Not classic: drill holes in the tops of the pistons to pressurize the top ring land.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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