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Post  roddie Mon Jun 17, 2024 2:37 pm

I got these parts in a consignment lot a few years back. Their cases/cylinder-piston assy's. have all been used to build custom-configured engines; mostly having the updated "horseshoe" back-end.. (backplate/carb.)

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The remaining orphaned Postage-Stamp back-ends got "bagged and tagged"..  Shocked awaiting their fate. What will that be.. and when? Will they be pilfered for their fine-thread NVA's?  Shocked  Shocked  such a travesty.

They came from the "ECE" (early Cox era...); where their overall engine-quality was the highest. We can only imagine (in horror..) at the amount of these engines that got tossed..... when their RTF air-frame counterparts became unflyable.

Fast-forward to this past weekend.. I decided to give one of the carbs a good cleaning. This one lacked a NVA "seal".. of which I had NOS spares.

I've been using "Plackers" dental cleaning brushes dipped in glow-fuel to clean the insides of my engines' needle-valve housings. These work really well for this.. and there's no chance of damaging the delicate internal screw-threads.

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I love the copper-star reed. This one is a replacement that came from my engine parts box.. and passed my blow/suck test.  Thumbs Up

The original 2-56 threaded case-screws were in the parts-bag.. and are in good condition.

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I needed a spring to complete the NVA... and looked to my general compression-spring stock; where I found a replacement that fit the bill as far as the diameter/wire-size was concerned.

I cut the length (lower-left pc.) which worked-out perfect.

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Last edited by roddie on Mon Jun 17, 2024 2:41 pm; edited 1 time in total (Reason for editing : added final pic)
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Post  balogh Mon Jun 17, 2024 3:06 pm

Roddie your careful engine part refurbishments are exemplary...you talk about my favorite reedies of which I hoarded more than 10 the majority having No1 cylinders of which a few are thin wall taper bore oldest stock units. The most aesthetically appealing to me reedies with astonishing performance, proven e.g in my Quickie100, revving near 28k unloaded in the air.

Unfortunately the beryllium star reeds are becoming unobtainium that really inflates the value of your stock. The plastic mylar reeds are thicker and slower and will not support the high rpm-s achievable with the thin beryllium reeds,  in my experience..

I replaced the NV spring on most with a tightly fitting silicone tube ending in a washer on its top end so that when set for max engine power, the NV should stay fixed. The black plastic seal turns brittle over time and will leak air, but the silicone tube sits on it and the NV tight with excellent sealing and vibration damping.

My first encounter with COX exactly 50 years ago was through this engine ending its carrier in a broken Stuka of a privileged friend who got hold of the plane from relatives in Western Germany, with us sitting behind the the then still existing Iron Curtain. He gave me the orphaned engine, which, turning me a COX engine maniac instantly, and a graduated mechanical engineer a few years later,  is still the pride of my collection, sometimes being on duty in my Quickie100 where I often swap engines.

Sorry for my lengthy commentary but the red posty turns me talkative whenever others write posts - with sentiments similar to mine- on it..
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Post  roddie Mon Jun 17, 2024 3:43 pm

balogh wrote:

Sorry for my lengthy commentary but the red posty turns me talkative whenever others write posts - with sentiments similar to mine- on it..

I LOVE this about us here.. and particularly your comment Andy (my brother's name.. I think I mentioned that a while back..) I just thought about what it might have been like to know you back when we were young boys. I'm sure that we would have been what they now call "Besties".. Smile
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Post  balogh Mon Jun 17, 2024 4:02 pm

Thanks Roddie, same thoughts here..as a non-native speaker I do not always recognize if I am too much with my overspilling comments but glad you got my point .. Hand Shake
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Post  rdw777 Wed Jun 19, 2024 1:28 pm

Nice refurbish on the postage stamp Roddie…Attention to the smallest detail as your work typically is…. It’s amazing the plastic in these engines has held up that well…. Some of these are from the 60’s and still just fine!….

I don’t blame you for getting excited about these Andras…. They are quite the performers as your Q-100 has demonstrated…. I think the engines from this time period are some of the best Cox ever made…
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Post  balogh Wed Jun 19, 2024 3:02 pm

Yes Robert. I also noted that Roddie refurbished those backplates to as-new shiny, with no scratch or blemish...

And yes, while I love COX engines regardless their production era, the strongest and best oerformers in my stable are those from the 60-s and 70's..I prefer collecting and using those, the older the better...
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