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Cox Engine of The Month
September-2021
crankbndr's

"Cherry Bomb" .051 engine

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Post  mitchg95 Thu Jun 28, 2012 1:42 pm

how can i tell the size of this engine?
ok cub co2 engine size Sam_1917
ok cub co2 engine size Sam_1918
thanks
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Post  daviddiag Thu Jun 28, 2012 1:53 pm

Technically speaking, its a motor, not an engine. That should stir things up! lol!
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Post  mitchg95 Thu Jun 28, 2012 1:54 pm

good point, still there is a Piston, Crank case, Crankshaft, and Cylinder
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Post  daviddiag Thu Jun 28, 2012 2:26 pm

Pi times radius square times stroke will give you displacement, as you know. Measuring bore would be simple enough. measuring the stroke would be difficult, as cylinder head does not appear to be removable. What a sweet little motor! Have you run it yet? Smile
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Post  mitchg95 Thu Jun 28, 2012 2:28 pm

i need to find a 8g co2 cartridge for it, the cylinder head is not removable as the cylinder head is part of the cylinder as one whole piece
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Post  microflitedude Thu Jun 28, 2012 3:44 pm

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Post  mitchg95 Thu Jun 28, 2012 3:45 pm

those might just work, ill try to get my old man to order them later tonight
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Post  mitchg95 Thu Jun 28, 2012 5:06 pm

this might help, the piston even has a wrist pin
ok cub co2 engine size Sam_1929
ok cub co2 engine size Sam_1930
ok cub co2 engine size Sam_1931
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Post  kpriddle Thu Jun 28, 2012 8:07 pm

Mitch,

Did you just unscrew the cylinder by hand? I haven't tried to disassemble mine yet, but I would love to check out the inards.

Be careful when you run it as your reassembly might leave the cylinder in such a position that the ball check valve is almost always pressed out of its seated position. As stated, this might cause a frozen piston upon charging. Be sure to start high and screw it down only a quarter-turn at a time. I'm sure you already know this, though. It's just a thought... Embarassed

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Post  Mark Boesen Thu Jun 28, 2012 11:07 pm

The OK CO2 'engine' was a .019, intro'd in '61, used .024 crank.
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Post  mitchg95 Fri Jun 29, 2012 12:00 am

@Mark Boesen wrote:The OK CO2 'engine' was a .019, intro'd in '61, used .024 crank.

so its a .019?
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Post  mitchg95 Fri Jun 29, 2012 12:01 am

i used a cox .09 wrench (the part that is used for the carb body)
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Post  Mark Boesen Fri Jun 29, 2012 12:13 am

yes, it's a .019
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Post  mitchg95 Fri Jun 29, 2012 12:24 am

awesome Smile i ordered the co-2 cartidges that Mfd posted the link to, so hopefully these will work. I definetly want to run this engine
can i use 3 in 1 oil?
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Post  happydad Fri Jun 29, 2012 12:36 am

@mitchg95 wrote:those might just work, ill try to get my old man to order them later tonight

be nice to us old men. i have RC cars to. big ones. LOL hd Small Cox Logo

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Post  mitchg95 Fri Jun 29, 2012 12:40 am

lol, ya. Im glad he ordered the co-2 cartridges Very Happy
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Post  RknRusty Fri Jun 29, 2012 2:00 am

3 in 1 is 20 weight. Way thicker than Singer or any other sewing machine oil.

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Post  mitchg95 Fri Jun 29, 2012 2:01 am

ok, ill look for Singer oil
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Post  RknRusty Fri Jun 29, 2012 2:07 am

@mitchg95 wrote:ok, ill look for Singer oil
Or any brand of sewing machine oil. MMO might be okay too.

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Post  mitchg95 Fri Jun 29, 2012 2:09 am

cool, ill look the next time im at the store
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Post  dinsdale Fri Jun 29, 2012 5:17 am

@mitchg95 wrote:good point, still there is a Piston, Crank case, Crankshaft, and Cylinder
But it's still motor. Its motive force is created outside the machine.
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Post  kpriddle Fri Jun 29, 2012 9:23 am

Mitch,

Remember that you can also use air tool oil or even light bicycle oil. If you are looking for the sewing machine oil, I found mine at Jo-Ann's Fabric and Craft store.

Good luck,
KP
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Post  microflitedude Fri Jun 29, 2012 9:29 am

@kpriddle wrote:Mitch,

Remember that you can also use air tool oil or even light bicycle oil. If you are looking for the sewing machine oil, I found mine at Jo-Ann's Fabric and Craft store.

Good luck,
KP

Harbor freight has some air tool oil at a very decent price. I use it along with sewing machine oil as after run for my Coxes. Sewing machine oil is supposed to very light and slippery opposed to other oils.
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Post  gcb Sat Jun 30, 2012 7:44 pm

Couple of comments:

I think the OK CO2 motor was introduced in ~1951, perhaps the '61 is a typo.

The fins are for heating, otherwise the engine would freeze up (literally).

Mine, unfortunately, does not have the cartridge holder.

ok cub co2 engine size Okco210

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Post  mitchg95 Sat Jun 30, 2012 8:17 pm

wow '51 Smile this thing is sweeter every time i think about it
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