Author Topic: identifying an engine  (Read 1884 times)

0 Members and 1 Guest are viewing this topic.

Offline alistair

  • Member
  • *
  • Join Date: May 2014
  • Posts: 10
  • Location: scotland
identifying an engine
« on: 24 May 2014 at 18:58 »
can anyone help to identify an engine which i have recently acquired,
It has 1924 stamped on the timing chest and the number 69782  on the casing above the rear cylinder.
it is on a mounting which looks factory made and i wonder if it could be a stationary engine or small industrial power source as opposed to a motorcycle engine.
how can i tell?
any help would be appreciated.

Offline Doug

  • Administrator
  • ****
  • Join Date: Mar 2004
  • Posts: 4240
  • Location: Glen Mills, PA, USA
Re: identifying an engine
« Reply #1 on: 24 May 2014 at 20:29 »

69782 would fall in the numbering range for a 1924, 2-3/4hp model. Douglas did indeed make stationary engine variants using these engines, but I do not know what numbering scheme that they used. Unlikely that they made 70k stationary engines, so I think this is a cycle engine re-purposed.

Most of the stationary engine 2-3/4hp have a oil sump and a place for a hand crank on the timing side. An example can be seen in this post:

There is another type without a sump (or I do not think it has a sump), on a larger cast aluminum base seen in this post:
While it looks like the motorcycle engine bolted in a cradle, the crankcase casting is slightly different between the two. Though I do not know if that stops you from using the motorcycle engine in one of these cradles, as the difference that I speak of concerns the top of the crankcase. 

At this link in the photo gallery is a 1925 model, that has some good pictures of the 'standard' 2-3/4hp motorcycle engine: