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Drilling the Venturi on Stunt Tanks

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Drilling the Venturi on Stunt Tanks

Post  AJP1604 on Wed May 30, 2012 3:37 pm

I hope someone can answer my question.

I have read that the venturi diameter on a Venom engine is larger than a Baby Bee/Golden Bee.I have a GB stunt tank that I want to convert to use on a Venom clone I am building.
My question is do I drill the Back Plate and Tank out to a larger size or just the Back Plate?
Also,is the correct diameter to drill .082?? confused

Thanks for your response in advance.

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Re: Drilling the Venturi on Stunt Tanks

Post  Kim on Wed May 30, 2012 3:56 pm


.082 is correct (to my knowledge) for the drill size. When I built up my 'Bad Boy' engine, using one of Bernie's Taxaco tanks, mounted to a standard Babe Bee backplate, I drilled the backplate and tube as a unit, and then flushed everything thoroughly.

Strangely enough, I have yet to stick a tach on it, but it does run and runs fast.

I'm sure that the serious engine guys will be checking in shortly. You might also consult Paul's Mouse Racing article in which is posted as a sticky under "Cox Discussions"

Good luck with your project.
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Re: Drilling the Venturi on Stunt Tanks

Post  RknRusty on Wed May 30, 2012 5:45 pm

Yes, .082" is the right size. Since I don't have a bit that size, I finger-twist a 5/64 bit (.078") and make it fit loosely. I only have BW tanks and they're already the right size. I don't know about the others.

Of equal importance is the width of the opening behind the reed. I don't know if they vary on the non-BW stunt tanks, but they are smaller on the Babe Bee tanks. I guess you would need a conical shaped ream to change that since the Bee tank venturis are tapered all the way back to the inlet.

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