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Lowest nitro content

Old 01-05-2007, 05:59 PM
  #1  
JasonFalls
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Default Lowest nitro content

Hi everyone, I was wondering what the lowest nitro content is that you can use in a babe bee or surestart o49 engines...
thanks
Old 01-05-2007, 06:43 PM
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rrragmanliam
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Default RE: Lowest nitro content

Hi Jason,

I've heard of folks running these engines on 10%- 15% but these low nitro content fuels haven't workrd well for me or most of the other people I know running these engines . 20%- 30% is the ticket for these engines and equaly important is 20% oil at least some if not all of it CASTOR OIL. I run 30% nitro Heli fuel in my 1/2A cox engines and add 3/4 oz. of castor to a gallon of fuel. If you do try lower nitro content fuels(and I wouldn't) be sure you have no more than one copper shim (head gasket).

Another key to getting these engins to run well is to reset the connecting rod in the piston with a reset tool. I've yet to get a brand new cox engine that didn't need to have this done to achieve peak rpm. The .049 reset tools come up for auction on Ebay occasionaly. You might also check Davis Diesel at http://davisdieseldevelopment.com/ they might still have the reset tool.

Check out the 1/2A forum ther is a Cox engine FAQ that will answer alot of your questions.




Darren
Old 01-05-2007, 09:00 PM
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Newc
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Default RE: Lowest nitro content

Out of curiosity, why did you start a second thread on the identical topic as the earlier one you started?

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