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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 7:11 am

Maybe? Or is it a four piece - piston, connecting rod, spring clip, and retainer.

Finally, a Cox three piece piston........... Cox_co10

Finally, a Cox three piece piston........... Cox_co11

Finally, a Cox three piece piston........... Cox_co12

Early tapered case, no screen venturi, large head needle, thin wall cylinder, and no Thimble Drome stamp on the fuel tank. Pictured last in the foreground.
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Post  rsv1cox Wed Mar 14, 2018 7:45 am

Hmm, not much of a happy feet dance over this thread. Sad Smile

Save me disassembling one of my Space Bug, Space Bug Juniors.  Is the same 3/4 piece piston (pictured) also used in both of them?

Bob
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Post  MauricioB Wed Mar 14, 2018 11:03 am

Hey Bob, your work is very dedicated and you can see the results, recover the motors and place them in a display case or shelf to enjoy them will fill you with satisfaction !.
I keep this thread very entertaining.
Now that I see the pictures of the piston and connecting rod, always ask me how this whole set is made, I would have liked to see a video of the manufacturing process ... not to mention the cox .010, that so tiny and precise is incredible,
Because pistons and connecting rods are not currently manufactured (assembly), it will be unprofitable ... or is it a very expensive process? ... it is always good to know a little more about these precious engines ...
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Post  roddie Wed Mar 14, 2018 11:51 am

Hi Bob, I have one of those pistons.. (at least one that I know of..) but can't remember running it in an engine. I'm not sure where it came from. It's currently in a small zip-seal bag with some other early Babe Bee parts.. in an effort to assemble a correct early example of the engine.

Finally, a Cox three piece piston........... Dsc05432

Note the "W-filament" glowhead. I included it because it's a unique design; not necessarily early.. but kinda' cool. I have five of those heads.

The "larger-knob" needle however is the 1st generation type. I'm not quite sure if all the other parts are 1st generation Babe Bee-correct.. but they're the earliest examples that I have. The main engine-parts pictured may have been an original assembly.. but I'll never know.
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Post  rsv1cox Thu Mar 15, 2018 7:19 am

Thanks roddie, looks just like mine except mine has a black fuel pickup tube and doesn't have the "Thimble Drome" imprint on the tank.

Finally, a Cox three piece piston........... Cox_co13

I have had a couple of the "W" element glow plugs pass through my hands but I don't know where they are now.  I marked the display stand on this one so I know there's a 3 piece piston in there.  Smile

Finally, a Cox three piece piston........... Cox_3_12

I'm not sure if this is an early glow head or not.

Finally, a Cox three piece piston........... Cox_3_11

Finally, a Cox three piece piston........... Cox_3_10

Bob

BTW - If you want to improve the appearance of the cylinder, lightly buff on a wire wheel to remove the old finish (works great to really clean inside the fins) and reblue (blacken) with some gun blue.  Brownell's Oxypho is the best.  The one on mine was particularly bad.


Last edited by rsv1cox on Thu Mar 15, 2018 9:50 am; edited 1 time in total
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Post  getback Thu Mar 15, 2018 8:50 am

I have ran a few of the 3 piece piston , and they run very well even with the extra play they have . Had a TD.049 was screaming and ran it too long on the bench and blew the rod in Half when i took it apart it was a 3 P set , i was [bleep] till i realized i had acquired several more of them . She was tacking around 21.5 Very Happy
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