Twin Motor

[GreenTwin]

This twin motor is listed on ebay.
Says "water-cooled, not sure what it came out of".

I would guess an auto engine ? Or maybe a boat engine ?
Not sure really. Can't say I have ever seen an engine quite like this one.

Any ideas on what this motor is, and what it was used for ?
(not my photos)

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Edit:
I suspect it is a marine engine, since it seems to have a water pump slung under one side, which would be pretty typical of a marine engine.

The advertisement says "Humber Motorcycle Engine".
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[GreenTwin]

I found this engine, but not the same (Gutbrod Superior).
Interesting engine though, 2-stroke, with direct fuel injection in the early 50's.

https://autotechnika.hu/cikkek/moto...ezvetlen-benzin-befecskendezesu-gepjarmumotor

The page is in Hungarian, but my browser (Firefox) has an option on the upper right side that will translate the entire page to English.
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[GreenTwin]

It does resemble the Humber on this page, but I am not seeing three cylinders.

http://douglas-self.com/MUSEUM/TRANSPORT/motorcycle/motorcycle.htm

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[GreenTwin]

This page talks about a Humber motorcycle engine that was water-cooled, and it looks a lot like the engine in the first post.

I think it is indeed a Humber motorcycle engine.

Edit:
On second thought, I think it is a Humber adapted for marine use, since there is a splined shaft out the back, which would not work for a motorcycle if the cylinders were fore-aft.

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https://moneyinc.com/1922-humber-cycle/

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[GreenTwin]

Video of a Humber.
Seems like a pretty advanced engine design for its time, especially the water cooling.