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Space Bug Jr. blue tank

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Space Bug Jr. blue tank

Post  ticomareado on Fri Mar 09, 2018 9:28 pm

Martin Hepperle makes the following entry regarding 1955 Space Bug Jrs. :

A Space Bug Jr. with a blue fuel tank. A Space Bug Jr. with a cream fuel tank.

Space Bug Jr. .049 (0.8 cm³)

Manufactured circa in 1955 (#370)

These engines already have the new single piece piston and cylinder design, which was used for the next 50 years on all Cox engines. Also the reed valve assembly was simplified and now used only one reed of 0.13 mm (1/200") thickness. Finally, the glow heads have the large thread which became Cox standard for the next 50 years. The remaining parts are identical, except for the colored fuel tanks.

The color was usually chosen to match the firewall of the models equipped with these engines (TD-3, Prop Rod, Water Wizard).

I am still looking for a sample with a black plastic tank.  [end of entry]

----------------------------

I acquired a blue tank Space Bug Jr. with a bozo plier mutilated old style cylinder/head/piston, so I am tempted to sub a clean early Baby Bee top end to cobble/restore this otherwise good looking specimen. Would that be kosher?
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Re: Space Bug Jr. blue tank

Post  Mark Boesen on Fri Mar 09, 2018 10:28 pm

Sure, they were the same parts. Look for proper plug, see photo.
The white SBJ was the first, followed by red and yellow, then the blue version. The white tank version was first sold with a prop nut instead of the spinner, some say the spinner was designed to pinch with fingers to help stop the engine and if i'm not mistaken i think i had read that in a Cox engine manual?




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Space Bug Jr. blue tank

Post  ticomareado on Sat Mar 10, 2018 6:16 am

Many thanks Mr. Boesen.

One more Columbo (Peter Falk) question:  I want to clean the tank/reed assembly/spray bar w/o tampering with reeds and retainers. I want to do this via a solvent soak and flushing with fuel bulb or syringe. Is the plastic tank impervious to acetone/MEK?
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Re: Space Bug Jr. blue tank

Post  KariFS on Sat Mar 10, 2018 6:42 am

I would not use MEK or such on the plastic parts. I have used denatured ethanol (camping stove fuel) for cleaning my engines. Heat helps, and if you have access to ultrasonic cleaner, it is a great help also.

I am not sure, though, how the blue plastic of your Bug Jr would take hot ethanol.

My Jr has the "natural" colour tank, I used hot water with hand-dish wash detergent to the plastic parts. I did a little write-up on that in another thread:

https://www.coxengineforum.com/t9381p100-recent-engine-acquisitions

Jump to page 5 and the Bug Jr story begins Smile
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Re: Space Bug Jr. blue tank

Post  ticomareado on Sat Mar 10, 2018 6:05 pm

"There were no gasket between the tank and the crankcase, not sure if there should be one. "--Kari

There should be a paper gasket--Mfg. part # 314-J Should be easy to make out of kraft paper or you might get away with some RTV sealant. Many thanks for showing me your project
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Re: Space Bug Jr. blue tank

Post  balogh on Sun Mar 11, 2018 1:07 am

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Re: Space Bug Jr. blue tank

Post  Oldenginerod on Sun Mar 11, 2018 5:57 am

balogh wrote:https://coxengines.ca/cox-.049-space-bug-fuel-tank-gasket-2.html

COX International sells the SB gaskets...
The Space Bug Junior has the plastic tank and these gaskets are advertised for a Space Bug, assumedly the metal tank version. Are they the same?

Rod.
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Re: Space Bug Jr. blue tank

Post  balogh on Sun Mar 11, 2018 6:08 am

Rod I think if the crankcase is the same cast one then it should work for both.


Last edited by balogh on Sun Mar 11, 2018 2:44 pm; edited 1 time in total
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Re: Space Bug Jr. blue tank

Post  getback on Sun Mar 11, 2018 9:34 am

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Re: Space Bug Jr. blue tank

Post  KariFS on Sun Mar 11, 2018 2:29 pm

Thanks guys, I too figured that since the cases are the same on both engines, the gaskets should also be the same. Just need to remember to add them to my next parts order Smile

My Jr will most likely not be run (by me anyway), so it has done OK so far even without the gasket Wink
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Re: Space Bug Jr. blue tank

Post  Oldenginerod on Sun Mar 11, 2018 4:56 pm

It looks like they might be different as Bernie lists them separately with different pictures. They also look like they are a slightly different shape.
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Re: Space Bug Jr. blue tank

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