I thank Arthur for his good opinion, but I can't be of any real help, I'm
afraid. Please can we see some more pictures?
I've taken the liberty of doing a little work on the photo, purely to help
me think, really
The first photo. See if that helps.
Inlet over exhaust and inlet pushrod actuated, certainly.
Whatever the "gas regulator" is, it is fitted into the cooling system, so
unless it is LOX cooled .... I think it's a thermostat.
There is a lump that looks suspiciously like a distributor without it's
cap - and it's in the right place to be skew or worm gear driven off the
In the foreground next to the tappets is what appears to be an oil pressure
The crankcase appears to be "one sided" and to be flanged at the side away
from camera. Is it open? It is dirty with oily gunge in a pattern that
indicates it was used in a vertical posture - but there is what might be a
petrol drip cock on the side of the manifold that could indicate a
horizontal application at one time.
It might well be paint of course, but does that barrel have a corroded
aluminium look about it?
To sum up, I'd agree with Nick. I'd stick my neck out and say a pre-First
War marine application. What it's father's name might be, the good Lord
alone knows. We are stumped for information about stuff made in the last