Greg:

I did some experimenting myself on this to kill my own curiosity on the subject.

Late last year i decided to try after run fuel for myself and compare it against my normal use After Run Oil. Remembering that the two main ingredient in our model fuel Methanol and NitroMethane are both hygroscopic and attract moisture into your model engine. I made up a litre of after-run fuel with 10% Castor as had all the ingredients at my disposal. I ran a bit through the tank at the end of our practice day on Sunday afternoon, it was hard to keep the engine running but I persisted until the note of the engine changed and fuel line was empty. Then pulled the engine down when I got home to flush it out like I normally would with brake cleaner.

Have to say the after-run fuel with the castor oil covered a lot more of the internals then what I was getting with a bit of after run oil straight down the glow plug hole and giving it a bump. You could still see droplets of Methanol but it was sitting on top off the oil layer itself. I don’t know that I would like to leave it sit like this for a long time before I pulled it down and flushed it out as castor oil will dry out, but in the short term it seems to be okay.

BB
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