The 2008 article has a video of Harry describing his engine. As it turns out, he is showing the non-working mock-up of the Mark 6 truck engine. It's just a shiny plastic simulation of what Harry thinks a real engine would look like.
But, Harry Schoell being Harry Schoell, he doesn't give the slightest hint that it's not a real engine and that a real engine had not even been built by that point. He just goes on about how great the performance is.
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