Engine

[Misterg]

The oval crankcase fits nicely with two crankshafts.

It looks like the second crankshaft runs where a camshaft normally would.

There's a cut away Knight engine at the start of this video, showing how it works (a Willys Knight):

Worth clicking if it won't play here. (I did mention the rabbit hole, didn't I? )

 

[Morrisman]

If you look closely there is no flat head it’s really odd looking I have worked on a few vintage engines but have not seen anything like this !!

I’ve worked on Yanmar diesel outboard motors, where the cylinder head is part of the block. The bores come up from below, pistons are slid in from the bottom, with over head valves, but no cylinder head gasket to fret about. Quite ingenious, but probably not an original idea.

 

[Stewtomcat]

That’s great at least I know what it is now if anyone is interested I will give them a rough location

 

[colnerov]

I’ve worked on Yanmar diesel outboard motors, where the cylinder head is part of the block. The bores come up from below, pistons are slid in from the bottom, with over head valves, but no cylinder head gasket to fret about. Quite ingenious, but probably not an original idea.

The Leyland 510 engine in the Leyland national bus was overhead cam with no separate heads, so the pistons were installed from the crankshaft end of the bore (separate cylinder block and crankcase).