COX TWIN 049x2

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topogigio

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Joined
Nov 19, 2023
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Location
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Good morning everyone.
Here is a project of a twin engine that I built a few years ago using COX 049 cylinders-heads-pistons.
I tried to make things as simple as possible but at the same time also take beauty into account.
No particular invention, the coupling system is widely used, the engine runs well and also makes a nice noise, in the video I still had ignition problems with one cylinder due to a faulty head/spark plug.
I attach the construction drawings in pdf with some 3D images and also a short video
I hope you like it, see you next time guys!!
 

Attachments

  • CENTRAL BUSH - OR SEAL - ASSEMBLY.pdf
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  • ENGINE BODY - REAR CAP.pdf
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  • FRONT CAP.pdf
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  • FRONT SHAFT - CENTRAL SHAFT.pdf
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  • VENTURI.pdf
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  • WASHER - SCREWS - GRUBSCREW - OGIVE.pdf
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Last edited:
These are the 3D pics
 

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I owned a number of those engines when I was young, and we used them to fly small control line airplanes.

Great engine, and for its size, it really produced a lot of power.

Very nice twin build !
Impressive.

.
 
Interesting how it kept on dropping one cylinder? Tweaking the fuel supply seemed to bring it back... I guess making it richer? - Suggests perhaps low compression on one cylinder?
But a nice engine, well presented. Just needs the reason for the miss-fire sorting out.
K2
 
Very cool!! MEB magazine ran an article on building a 3 or 4 cylinder version using a ZMAC crank housing. Very useful info on making ZMAC molds from aluminum.
That was called the Hex-2 and the Hex-4. They started out using hex bar as a crank case. Then a crankcase was cast months later. I even made one with my own crankcase later named the Huck-4 by the person who designed the engine.
 

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  • DSCN1517.JPG
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