 A few weeks ago Siegfried Otto Hepp - automotive historian from Germany - came up with a most interesting mystery engine. That is to say, he found these photos in an archive with Adler material. Yet so far he couldn't find any documents in the Adler history referring to this prototype. The twin carburettor set-up suggests a sporty ambition, but we really don't know. Looking forward to hear any good suggestions. |
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Mystery sleeve valve engine!
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