These are plans for IC engines of all sorts of configurations, some practical for putting to work, others, just tabletop demonstrators.

Image	Description	File Spec.	Download
	4 Stroke Engine: An interesting single cylinder 4-stroke demonstrator engine. It is in metric and drawings in French, but easily followed.	10 Pgs 260 kB
	Kertzel Hit and Miss: A recently designed hit-and-miss IC engine that has very well detailed plans and instructions.	30 Pgs 1.6 MB
	Webster Horizontal: Another recently designed hit-and-miss IC engine that has very well detailed plans and instructions.	32 Pgs 1.6 MB
	Boll Aero Engine: A model airplane engine, 0.18 cubic inches, 2 stroke.	11 Pgs 600 kB
	McGee Model Engine: Here's a 1" bore, 1" stroke, 13,000 rpm model engine. That's really big for a model engine.	32 Pgs 1.6 MB
	Moore Model Engine: This is a 2 cylinder model, that the builder claims is great for racing.	12 Pgs 1.9 MB
	Parohl Engine: Another interesting model engine for the home builder.	7 Pgs 1.4 MB