ORIGINAL: I-Love-Jets


Correct,

the oxidative nature of nitro fuel to most metal surfaces (ferreous, aluminium, brass) should not be undervalued.

For instance there are R/C speed boat classes using > 50% nitro fuels. These engines have to be “cleaned“ internally with straight FAI fuel (80/20) after each race.


Procedure:

Most important is that the engine has to be “afterrun“ with the zero % nitro fuel at hot operating temperature. The high internal engine housing/cylinder/bearing/crank etc temperature together with pinching-off the fuel delivery at full throttle ensures complete evaporation of all nitro and methanol residuals within the engine.

After that zero nitro afterrun procedure only the lube oil is left within the engine being a perfect conservation until next week’s operation.

Additional special afterrun-oils are not necessary as a rule.