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by rsv1cox Fri Oct 04, 2024 6:32 pm
Cox Engine of The Month
Space Bug Jr Hop-up kit
Page 1 of 1
Space Bug Jr Hop-up kit
My pal used to have a Space Bug Jr Hop-up kit that was from Cox. He told me it had a bigger venturi and dual bypass, plus a 302 high compression head...but my memory may be a bit dim. Anyone here have one they can share with us to see what it was?
Jay
Jay
jmendoza- Silver Member
- Posts : 70
Join date : 2017-07-18
Re: Space Bug Jr Hop-up kit
I got this one at a Swap Meet a long time ago (20 years or so). Unfortunately, it didn't have its instruction sheet.
The "Hop-Up" glowhead (on the left in the photo) does not appear to be any different from the spare sent to me by one of our members (sorry I forgot your name, but it IS still appreciated!). This is assuming that stuff wasn't swapped around before I got the kit.
So, maybe someone here can tell us how the "Hop-Up" came about.
The "Hop-Up" glowhead (on the left in the photo) does not appear to be any different from the spare sent to me by one of our members (sorry I forgot your name, but it IS still appreciated!). This is assuming that stuff wasn't swapped around before I got the kit.
So, maybe someone here can tell us how the "Hop-Up" came about.
Kim- Top Poster
-
Posts : 8608
Join date : 2011-09-06
Location : South East Missouri
Re: Space Bug Jr Hop-up kit
Some info on the Space Bug hop up kit. Never heard of one for Jr. Space Bug came with two intake bypass cylinder.
https://www.coxengineforum.com/t11486-space-bug-ads-in-1952-issue-air-trails-magazines
EX has a Q&A sheet that mentions the kit
http://www.exmodelengines.com/sbquestions.pdf
https://www.coxengineforum.com/t11486-space-bug-ads-in-1952-issue-air-trails-magazines
EX has a Q&A sheet that mentions the kit
http://www.exmodelengines.com/sbquestions.pdf
crankbndr- Top Poster
- Posts : 3102
Join date : 2011-12-10
Location : Homestead FL
Re: Space Bug Jr Hop-up kit
Thanks guys. That is the kit I remember, but was mistaken about the cylinder. The tank does have a bored venturi, notice the directions tell you to open the needle valve 2 extra turns due to that. The high compression head is tricky because depending on how much nitro you use, it may require extra gaskets, or possibly using the low compression head. Weather and air density has an effect also.
I talked with one of my friends who worked with me at Cox, and he verified that the first batch of Space Bugs did come with standard short glow plugs. Cox found that there was too much variation in different brands of glow plugs that affected the engine performance so they decided to make their own plugs, and then glow heads to ensure repeatable engine performance.
I talked with one of my friends who worked with me at Cox, and he verified that the first batch of Space Bugs did come with standard short glow plugs. Cox found that there was too much variation in different brands of glow plugs that affected the engine performance so they decided to make their own plugs, and then glow heads to ensure repeatable engine performance.
jmendoza- Silver Member
- Posts : 70
Join date : 2017-07-18
Re: Space Bug Jr Hop-up kit
Oh, my mistake...I hadn't had enough coffee before reading your post and missed the "Jr" !
Kim- Top Poster
-
Posts : 8608
Join date : 2011-09-06
Location : South East Missouri
Re: Space Bug Jr Hop-up kit
jmendoza wrote:.
I talked with one of my friends who worked with me at Cox, ...
I cannot tell you how much I envy you for your employment by COX...
balogh- Top Poster
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Posts : 4904
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Cox
Had I not worked at Cox in customer service, I would have never known about the "Bug" series of engines or the RR-1. Dale Kirn designed the RR-1 and I still have a faded copy of the blueprint for one that he gave me.
jmendoza- Silver Member
- Posts : 70
Join date : 2017-07-18
Re: Space Bug Jr Hop-up kit
Some more info in this discussion https://www.coxengineforum.com/t11486-space-bug-ads-in-1952-issue-air-trails-magazines Thanks for dropping by Jim !
getback- Top Poster
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Posts : 10381
Join date : 2013-01-18
Age : 67
Location : julian , NC
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