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Cox Engine of The Month
February-2024
1/2A Nut's

"RC Speed Boat Power Drive TD .020"

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Post  rsv1cox Tue Mar 13, 2018 9:43 am

I'm still trying to reconstruct, make sense out of this mixed parts mess.

In trying to match what with what I found this cylinder with a slit exhaust port on one side and a standard open port on the other with twin intake flutes.  The baffle has two hole openings.  The case has the clip on notched stop.  I think I have the correct parts to make up one engine.

Checking the Cox Engine and Wiki sites I find nothing about it. Any ideas as to what it came on -car, airplane?

Strange Cox Cylinder(s) Cox_cy10

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Got this yesterday.  Why would anyone mill the top two fins off?

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Post  JPvelo Tue Mar 13, 2018 9:57 am

My guess is the wrench slipped and buggered up the top fins. I speak from personal experience.
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Post  ticomareado Tue Mar 13, 2018 10:09 am

From a special Cox product for the West Virginia market only?
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Post  rsv1cox Tue Mar 13, 2018 10:39 am

ticomareado wrote:From a special Cox product for the West Virginia market only?

Ahh, A West Virginia joke. Smile We have another - "Nice tooth". But being from New Hampshire, I'm not a native but have grown to love this state.

A revelation. The strange cylinder will not screw into a standard Babe Bee case, the threads are different. Could it go to a Medallion? I don't have one to compare.

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Post  KariFS Tue Mar 13, 2018 11:40 am

049 Medallion and Bee cylinders are interchangeable. Could the thread be just a little beat up or something?
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Post  rsv1cox Tue Mar 13, 2018 12:45 pm

KariFS wrote:049 Medallion and Bee cylinders are interchangeable. Could the thread be just a little beat up or something?

The threads look good, seems the pitch is different but I'm not sure. Only one with just two rows of threads not three.

Extreme right. Still, the only one that I have found with slits on one side, standard on the other. I would like to know if I have the right baffle for it.

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Thanks - Bob
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Post  balogh Tue Mar 13, 2018 1:23 pm

The black throttle stop and mounting bracket seen on your pics are described on p.17 of the COX Model Engine Handbook.

Strange Cox Cylinder(s) 15209610
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Post  rsv1cox Tue Mar 13, 2018 2:32 pm

Yes, I found that Andras, but nothing on this type of cylinder.  Nothing that I can find on the net either.

By baffle, I mean the restrictor collar that rides around the cylinder.

Bob
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Post  fredvon4 Tue Mar 13, 2018 2:52 pm

Bob never did it just one side... BUT I dislike the twin slits... I tried all sorts of cutting to remove... Had and AH Ha moment and pried a small screw driver in a bit up and down... popped right out----slight tad of deburing inside....where I got a bit deep with the screw driver

_yours ---perhaps worth quite a bit on E-bay as RARE VINTAGE one OFF racing engine.... grin

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Post  Surfer_kris Tue Mar 13, 2018 3:41 pm

I think that one can see the traces of a slit on one side, so perhaps someone broke off the slit on one side only?

The thread pitch is hard to tell from the image alone, it certainly looks a bit damaged? Have you compared it to the one for the glow head, they are usually the same?

The fewer number of threads might simply be a machining error, there are lots of odd features one can find in items that should not have reached the end user...
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Post  rsv1cox Tue Mar 13, 2018 5:03 pm

Thanks guys, my mini mystery solved.

I got out the lighted magnifying glass and sure enough someone cut out the other side slit. It's a standard #7 cylinder. My eyes are not what they used to be.

Strange Cox Cylinder(s) Cox_cu10

There was a post here a time ago about that very thing.

Bob
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Post  NEW222 Tue Mar 13, 2018 5:06 pm

Ok. At least the mystery is solved. Very Happy I too have heard of this procedure before. I was initially thinking someone made this configuration from a blank cylinder.
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Post  ticomareado Tue Mar 13, 2018 5:25 pm

I also appears to be threaded for non-SPI. Modified by a West Virginian to run off liquid fuel synthesized from coal in a back yard still.
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Post  ticomareado Tue Mar 13, 2018 6:57 pm

Let's step it up a bit. Take a trashed out Bee crankcase and bore a 1/8" or so hole in bottom where dead center cylinder bore falls and secure a bolt/lock nut in hole that chucks into drill. Now glow heads can be sandpapered with impunity and dirty cylinder grooves can be spun clean using cotton parcel bailing twine.
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