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Originally Posted by elhigh
It's been my impression that greater volume in the cylinder = less cylinder wall per unit of volume through which to lose heat.
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Makes sense.
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When Deere was still using two cylinder engines, one of their biggest tractors at the time set a record for fuel efficiency that wasn't broken for over 25 years. Each cylinder displaced about three quarts - seriously, each cylinder displaced more than my truck's entire engine.
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Match the bigger cylinder displacement with a fewer amount of cylinders, and it ends up decreasing the overall amount of internal friction spots.