I forgot to run my engine dry at the field the other day; however, I put in a carb full of after run oil. Will it be okay for a few days without rusting?

I have never used after run oil and I forget to run my engines dry 50% of the time. in 19yrs I have never found any rust in any of my engines. However, I always store them indoors and I use fuel with 22% oil, half of which is castor.

David

Hi!
I never use any "special" afterrun oil!
Only the same synthetic oil I use in my engines (Motul Micro) and even then very seldom . This oil has rust inhibitors!

You may have a serious problem after a few days or you may not have a problem in your lifetime of modeling. Results vary.

Bill

....keep the carb closed and stuff some papel towel into the exhaust outlet when
the engine is not being used.

....No water (humidity)....no rust. Castor oil in the fuel is the best answer to avoid
internal rusting as well.

FBD.

+1

I always do the opposite. I leave the carb wide open. If it is closed it can get condensation in it. Maybe not in a few days but over the winter it can.

To get back on track you should be fine. Most of the guys I fly with pump out the fuel and go home everytime.

David

....ideally the engine should be run at the end of the day with the fuel line removed,
the tank emptied, remove the vent line to the tank, and open the carb fully. Applly
the glow and hit it with the starter. It will only run for a few seconds.

This burns the residual methanol from the carb and crankcase in a two stroke. The
methanol is what attracts the moisture that causes the rust. This will also suck any
residual from the carb as well. The castor oil will remain behind to protect the steel parts.

Now close up the carb, and plug the exhaust to prevent moisture (humidity) from
getting to the inards of the engine. There are some neat rubber carb covers that
seal the carb real nice from moisture and dirt.

I have always plugged my exhausts at the end of the day to keep the oil from dripping
out at unwanted times. I have never had a bearing rust in 36 years. I use to live in the
Harbor of Los Angeles where the salty marine air will rust and pit almost any metal
including aluminum in a short period of time.

FBD.