Fuel
The highest performance is achieved with fuel of 30% or more nitro content. At least 20% oil (50/50 castor/synthetic) is recommended. Acceptable performance can be had without nitromethane, although the engine will be very sensitive to needle adjustments making it more difficult to operate. With high Nitromethane (nitro) fuel it may be necessary to lower the compression by installing up to six or more additional head gaskets.
When using Castor Oil it is advisable to clean the engine cylinder wall with a Scotch-Brite pad to remove castor oil varnish buildup that will occur, especially after lean running. This buildup of varnish will cause the engine to run inconsistently.
To avoid this problem, it is advised to use a Synthetic oil or synthetic and castor oil blend. Synthetic oil contains detergents that will keep the cylinder wall clean, however these small engines do rely on some castor oil buildup to maintain high compression at higher running temperatures.
Using clean fuel and keeping everything clean and free from dust and dirt particles is also very important for consistent running in an engine of such small size as these.
Cox Fuel Formula
| Fuel Name | Methanol | Nitro-methane | Castor Oil | Klotz Oil |
|---|---|---|---|---|
| Glow Power | 70% | 10% | 18% | 2% |
| Flight Power | 65% | 15% | 18% | 2% |
| Race Power | 50% | 30% | 18% | 2% |
Read more about this topic: Cox Model Engine
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