Help ID O&R .29 Glow Engine

NEW222 Tue Apr 30, 2019 6:22 pm

So yesterday, I did get this old O&R .29 glow engine. I have not had anything this old before, and would like to see if anyone here would possibly be able to help me identify anything about it. From what I have read before, I do not believe that this was a fuel to nitro conversion. However, I may be wrong. The plug in it is a Champion glow plug. Mainly, I would like to know what year it was manufactured, serial number 001906, what propeller to use, and what fuel to use in it. I have and use Omega 5% nitro with addes castor, as well as a little bit of Sig 5% nitro 25% all castor. If only for bench running a time or two, would either be ok? Also, there appears to be some sort of 'clip' in teh venturi held in place by the needle assembly. Lastly, what propeller would one suggest on this old engine. The one on it is 8 x 4 I believe, but the finish on the wood is cracked and peeling so am unsure of running it and would rather but a new propeller. Thank you in advance for any and all help you may be able to give.

Also, this will be cross posted, so if you see it elsewhere, please disregard.

Ken Cook Tue Apr 30, 2019 7:47 pm

The glow plug was introduced in 47. Your engine was probably produced in or around 49. These engines are pretty gutless but fun to run. A prop 9x5-9x6 preferably wood is recommended. Keep the oil all castor and at least 25% minimum. These engines can't be taken apart aside from the bottom end of the crankcase so don't attempt it. The cylinder is spot welded on. Keep the nitro 5-10% and nothing higher. Hopefully the metal tab is in the venturi in which the spraybar passes through. The venturi by itslef is too large to draw fuel properly without it. In addition, the engine was offered as a glow. The plug while it appears to look like a spark plug is a glow plug. Take that out and save that as a collectors item it's a Champion V-1 or V-2. This is the engine you use the POS Fox plugs in to bench run.

Oldenginerod Tue Apr 30, 2019 8:37 pm

Ken Cook wrote:These engines can't be taken apart aside from the bottom end of the crankcase so don't attempt it.

The piston & rod also comes out easily. With the front case off, turn the rod 90º, lower the piston and swing the rod out the front of the case, then draw the piston out the bottom of the bore. Hopefully there's no need for you to dismantle it.

I have a parts engine. Front case is missing so I have no idea how to identify the size. I'm thinking it looks bigger than a .29. Anyone know how I can ID it? Bore size?

NEW222 Tue Apr 30, 2019 8:51 pm

Thank you for your help. Yes, the metal 'tab' is in the venturi. Also I did plan on removing the plug for running, but keeping it in place for storage. It still glows good too. The only upsetting thing is that the head of the plug is shaved/worn off, almost as if it landed inverted so to speak. It has a good 'pop' to it when flipping and is very free so I am glad I did not have to take it apart, especially after reading that it is welded together, and also that the rear 'bearing' is or can be a PITA to remove/reassemble.

I do not know Rod, but if you want, I can take specific measurements from the outside that may help on identifying size.

Oldenginerod Wed May 01, 2019 12:35 am

For some reason I can't get the photos of my O & R off my phone.
Anyway, if anyone can compare these dimensions to their own engine and confirm what it is, I'd appreciate it.

Bore- 19mm (3/4")
Diameter of head- 30mm (1 3/16")
Top of exhaust stack to top of head- 22mm (7/8")
Width of case below mounting lugs- 32mm (1 1/4")
Serial number- 017637.

Ken Cook Wed May 01, 2019 4:28 am

It's probably .33

NEW222 Wed May 01, 2019 6:47 am

I can get the measurements from mine tonight when I get home for you to compare.

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