Building Tips and technical articles. > 1/2 A building.
Cox .049 fuel
Bill Little:
HI All,
Boy do I feel dumb!
This a question about fuel for my Cox engines. "Back in the day" I could get teh Cox fuel in the local hardware store. It's long gone!
I have various "full size engine" fuels. One is a gallon of Cooper 20% nitro, mostly synthetic oil. I took some of that and added a good bit of castor to it.
I do have the Sig Champion 10% 1/2-1/2 fuel.
What is "usuable", and which would be best?
Thanks!
Bill <><
frank carlisle:
Bill...........Jan and I have been using Norvel Fuel....It comes in different amounts of nitro. We have 25% nitro 18% oil.
The Cox engines we have seem to like it pretty well.
James Lee:
Bill
Around here we've found the Sig 25% Champion fuel to be a good 1/2 A fuel. The Cox has to have a fair amount of castor to keep the piston ball socket from coming apart. That was from Dale Kirn, many years ago... I think the old Cox fuel was all castor, but I don't know what percentage.
Jim
Bill Little:
Thanks, guys. Main problem is that I don't have a really "local" source of anything, fuel or otherwise. I CAN, however add castor to fuel that I have. Or mix and match. That is why I referenced the Cooper, it is 20% nitro. Everything lse is not over 10%, basically.
I was thinking that the Cox needed castor from some long forgotten bit of memory......
I finally got me a Davis "rod setter" for the Cox engines and took a couple apart to check them. All of them had rods that were getting loose in the pistons!
Bill <><
George:
Bill,
I believe Cox fuel was 15% nitro and their Racing Fuel was 25% nitro (perhaps 30% at one time). I believe it was either 18% or 20% all castor lube.
George
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