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Hispano-Suiza V8, possibly Wright-Hispano.

yavor.dinkov Thank you! Is there any way to narrow it down to one type?

Provincial Archives of Alberta May be. There are several coded parts. Can You post the codes from a high-resolution picture? In this way identification can be confirmed. Otherwise, an exact combination of details can point to a specific model but there are many variants of this engine ... Regards, Yavor

This and the adjacent photo (see below) in the collection are of the same cutaway Gnome 9-cylinder rotary engine (proof stampings, wear marks and tool marks are identical in both photos). A view of the two photos at the largest resolution reveals a "Gnome Engine Company - 47 Victoria Street, Westminster, S.W." manufacturer's plate, and a serial of "Engine No. 30767". Presumably, this was a British license-built / British affiliate manufactured Gnome et Rhône 9-cylinder engine. Unfortunately, I haven't the knowledge to describe the variant of engine with any further specificity. Hopefully, another can use the engine's serial number and origin to provide more information. Unlike a radial engine, which featured a fixed cylinder block with rotating crankshaft, the rotary engine's crankshaft remains stationary and the entire cylinder block rotates. Before being cutaway for use in training, it is likely this engine was used on an aircraft (or a number of aircraft) until it was deemed unfit for further rebuild. See: en.wikipedia.org/wiki/Gnome_et_Rh%C3%B4ne

Thank you very much for this wealth of information and your sharp eye! It's always good to fill in the blanks on these sorts of photos.

I think this is a segment of a Curtiss OX-5 V8, which was a commonly used engine for training aircraft in Would War One. You have two other photos that show this type of engine. This one: shows what looks like a different segment from an OX-5, while this: shows a complete OX-5. This segment appears to be the engine's front pair of cylinders, and we're viewing it from what would be the engine's rear end. The cylinder walls have been cut away to show the pistons and valves within. The cut through the segment also shows channels where lubricating oil would flow inside the crankcase and around the crankshaft, as well as the oil sump at the bottom of the crankcase. This looks like a training tool for engine mechanics.

Thanks a lot for this information!