In my country, nitro methane it is too expensive.
We are trying other substances to replace it
(amyl nitrate and methyl nitrate) that we use at 0.1% vol/vol in methyl alcohol/castor oil mix, and improves accelerating and running but not increase rpm.
These substances are easy and cheap to make but
We asked ourselves if the glow engines could be
damage with the course of the time.
We have not found information about this, just that amyl nitrate is used in diesel RC engines but not in glow engines.
Any information about this matter will be appreciated.