I got a rather large OS engine in an estate sale. It runs fine on the test stand but I don't know what it is. The markings on the case say "BX1" Any ideas? I think it might be a 1.08 but it seems to large for that engine.
Sparky

http://www.osengines.com/history/osm...bgx-1-ring.jpg

Look on the engine under the exhaust outlet. They usually placed the displacement of the engine right there.

Isn't the BGX-1 a 30cc? IIRC it is...that would make it a 1.80 c.i.


Edit: I see that it's actually 35cc (thanks FBD )

Here's the manual
http://manuals.hobbico.com/osm/bgx-1-ring-manual.pdf

I've never seen this in any of my OS manuals before:

You are correct....the BX1 is the same as the old 1.08 FSR. At one time the
OS 1.08 FSR was just about the most powerful engine made.

The BGX-1 is actually a 35cc engine.....much larger than the 1.08.
I have a couple of the big ones....and one of the OS Pitts style mufflers.

FBD.

Has anyone ever converted one of these big OS engines to gasoline?

Dr.1

I seen a BGX converted to gasoline with C&H ignition and a walbro carb, and the performance was sad. You have to run a very rich oil to fuel ratio (if I remember correctly it was 16-1 or 20-1) because of the bushed connecting rod. All decent gas engines use needle bearings on the connecting rod. The engine was mounted in a Midwest AT6 and the performance was lousy. It also ran alot hotter than the glow version (lack of proper cooling fins). I would not mess around tring to convert it. The owner eventionaly converted it back to glow.