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Engine basics => Engine set up tips => Topic started by: Colin McRae on February 05, 2023, 10:54:16 AM

Title: Fox 15 CL Fuel
Post by: Colin McRae on February 05, 2023, 10:54:16 AM

I have a NIB Fox 15 CL engine. Am planning to start initial break-in on my test stand. My question relates to the best fuel to use. The reading I have done just says it works best on 'Missile Mist' fuel. Missile mist as I understand it is 25% nitro / 18% castor. To me the oil content seems low for the engine metallurgy, and the nitro seems a bit high.

Could the experts out there please recommend the best fuel makeup to use. I do have some 15% & 25% nitro fuels, both 23% total oil (50/50 castor/syn). And have castor that I can also add. I want to use a fuel that has a good balance between power and engine longevity.

Thanks in advance.

Title: Re: Fox 15 CL Fuel
Post by: Peter in Fairfax, VA on February 05, 2023, 12:29:59 PM

The .15x, with the slant plug?  Or the later 15BB schnuerle?  Curious as to which, but I'd run about 25%, half castor in either.

Title: Re: Fox 15 CL Fuel
Post by: john e. holliday on February 05, 2023, 01:24:13 PM

I run the same fuel I use in my stunt engines.  10% nitro,  22% oil, 1/2 castor 1/2 synthetic.  Do not lean it out to a fast 2 cycle. D>K

Title: Re: Fox 15 CL Fuel
Post by: Colin McRae on February 05, 2023, 05:35:58 PM

Quote from: Peter in Fairfax, VA on February 05, 2023, 12:29:59 PM

The .15x, with the slant plug?  Or the later 15BB schnuerle?  Curious as to which, but I'd run about 25%, half castor in either.

Sorry, it is the older slant plug design.

25% oil (50/50 castor/syn) it is.

Thanks