Why do you want low fuel usage from a sports car? What kind of MPG are you looking for? Why does the engine need to be specifically light? I understand wanting to build a car, thats why I started building mine (with the engine out of a FWD Escort)
Maybe you'd be better off with a motorbike engine if you want light. Although you'll only manage 30 mpg with something like a Triumph 3 cylinder. I believe the whole engine AND gearbox only weighs in at modest 70kgs but it gives you 100 plus BHP.
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