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Old 05-02-2012, 10:55 PM   #49 (permalink)
tortoise
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Join Date: Aug 2011
Location: Sequim, WA
Posts: 71

number 9 - '89 Geo Metro LSi
90 day: 49.25 mpg (US)
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So, the ultimate in ICE fuel efficiency would be a single. You could start with an end combustion chamber off the head from a Chevy 5.3 liter LS truck engine, a stroke of about 4.5 inches would give you 50 cubic inches, about right to power a light car. You'd probably want counterrotating balance shafts.
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