It resulted in Pistons coated in a black carbon coating, or a thick brown varnish. Looking at older engines internals that were made when the technology was changing fast back in the seventies and eighties the results of overheating and castor oil were all too often plain to see. Castor oil when burnt produces carbon and when overheated coats moving parts in a sort of varnish that in turn causes more friction and more heat and ultimately engine failure. By heat I don't mean touching the casing to test it, I mean internally during combustion etc. Reasons NOT to use Castor based fuel : Technology has moved on and modern engines produce more power and hence more heat. Most of the flyers I know who use castor use it because its cheaper and will make up all sorts of reasons not to use synthetic oil based fuels in their modern engines. ![]() You will always meet modelers who have grown up using castor and wont change or try synthetic based fuels due to various old wives tales and myths. I don't intend to upset any fellow modelers or start ANOTHER Castor /Synthetic oil war of words. ![]() I'm sure you really knew I meant a suitably graded synthetic?Įnya have always said good synth is fine, I'm curious as to why everyone is reluctant to use it even now. 0-10 is an extreme unless you have a race engine, most modern road cars would suffer on that.
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