Fully functional miniature engines: W16, Offenhauser...
 

Trivia on the guy building these engines:
Former engine designer at SAAB. He retired back in 2001. But it was he that designed their first turbo engines back in the 70's making way for the whole new commercial use of turbochargers in small vehicles. His engines was also amongst the first using coil on plug back in early 80's.

Back to the smaller engines!

Thought you had seen some cool miniature engines on the interwebz before? Well forget about those and look at these! :beer:

Buggati W16 (ff to 2.10 to hear it start).
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Offenhauser (that thing sounds awsome! Ff to 1.20 to hear it start).
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Rolls Royce Merlin (ff to 5:40 for start)
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Mercedes Benz. First car engine in the world.
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Cool.