Searching for data about the original engine is becoming a black hole for time. What I've seen of the Benz 1886 patent just shows some detail about the car. There are apparently a few full-scale operational copies of the car and it's engine in existence, so there must be some engineering drawings somewhere. I'm still looking.
The original engine had a compression ratio of 2.7:1 (not much) and made about 3/4 hp at 400 rpm.
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