Emerson's Brooklands ABC Sopwith - a question?

The attached pictures show a ABC Gnome Rhone with a small finned oil sump under the engine. It looks to have a oil pump on the/driven from the timing case. Not sure how the oil plumbing works or the age of this engine. The frame/running gear is obviously later and from another machine.

Bob Thomas' Sopwith was reputedly a race machine. And sure enough, it did (does) have a shortened front leaf spring. It appears in various photos, ref. for instance Newsletter No. 1004 of December 2013.
I think it still reposes at Milntown, near Ramsey in the IoM.
Otherwise, its spec. seemed fairly standard. But who knows what might lurk inside the works?

Oops! Forgot to add the following to the previous.
There is plenty of evidence, photograhic and otherwise,that very early Sopwiths (prototypes) were equipped with a pressed-steel oil sump, and an oil pump which presumeably circulated this oil to all the important bits. The drive to the pump was via a downwards extension to the timing chest. But probably as a cost-cutting exercise, all this was abandoned. The simplified design that later went into production, as time has richly demonstrated, was certainly adequate.

Hi Please see attached photos of Bob's race bike. You can see the revised oil pump, I think it is similar to the one that Norton fitted. As can be seen there is no attempt to recirculate the oil, it is still a total loss. I guess he was only doing short races so it didn't matter(?) Also please see the springs he appears to have had fitted onto the original value gear. Does this help with anyone's interests? I have also included a snap of another bike that has a different oil pump but I can't recognise it. I have some more pictures if anyone needs any more details. Regards Neil

Hi Neil
Are you in the isle of man if so can you confirm that Bob's brooklands bike has larger inlet and exhaust manifolds I think it was in an article some time ago when he as still about also it had sand inside the engine.i think it is the one raced at pendin sands by handle Davies ? The exhausts look larger because he has had to put spacers in to get a nut on

Hi Keith
I'm not on the island. I compared the photos I had with one from another bike and the manifold may be slightly larger but both seem to need the spacer washer. Regards Neil