The Better Half VW conversion produces approximately 30 horsepower at 3400 rpm with standard 92mm cylinders, though builders can increase power to 37 horsepower or more by using larger bore cylinders.
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Better half VW

The Milholland V-twin engine, properly called the Better Half VW, represents one of the most successful lightweight four-stroke powerplants in the homebuilt aircraft world. Designed by Leonard ...