Remember those threads about the guy building mini Hemis, 427 Chevys and the Viper V10? This bloke in England built a diesel Delta 18 cylinder 36 piston opposed stroke, and it's design dates back to the 20s. It's amazing how compact this configuration actually is (not the outright size).
http://www.craftsmanshipmuseum.com/Tomlinson.htm
http://www.craftsmanshipmuseum.com/Tomlinson.htm
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