ORIGINAL: PipeMajor
It's getting impossible to find in-stock fuel suitable to run an old iron piston/steel cylinder Fox engine these days. The 17% synthentic content RC fuels will kill a Fox. You need an all-castor (or at least a 50/50 castor/synthetic blend) with mininum 25% oil content.
How about this? I use Wildcat Fuel for RC. I use 5%, 10% and 15% with the 80/20 synthetic=castor blend. 5% fuel is 16% oil. 10% is 18% oil.
20 oz. 5%nitro, 16% blended + 4oz. Castor + 8 oz. 10% with 18% blend will result in 32 oz. fuel-mix with about 5.6% nitro and 27% oil @ .49% castor.
My broken-in Foxes run fine on that mix. Both Brodak and Sig have good castor.
Makes life easier.
