ORIGINAL: jaka
Hi!
TheCastor oil we used (got from the AMA )at the 1995 pylonracing world championships at Muncie were leaving a lot of black goo in our engines! Fuel was 80/20 "Riche's Brew"!
I don't think we have inferior Castor oil over here in Europe as we use Castrol M, castor oil. But the fact is, Castor oil leaves a film (black or brown) inside the engine that is constantly building up during time on piston sides and in the combustion chamber...and this is no good!
Using synthetic oil ...or a combination of synthetics and castor oil prohibits all this carbon build up.
Regards!
Jan K
Sweden
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Hold it. Stop the music! <G>
Racing? I'm not talking about racing applications where the engines are stressed with high compression, etc. I'm talking about sport flying with normal engines.
Yes, there will be some carmelization over time, but you won't see it during break-in. And you will not see black build up from castor oil unless the engine is running too hot.
Another application that abuses the hell out of a glow engine, even during normal operation, is in a helicopter. My comments do not apply to any other usage of castor oil than in regular, medium compression, two-stroke glow engines that you will find at any flying field on an average day. No pylon racers, no hydroplanes, no helicopters, etc.
Now, I know that you are an experienced modeler and that you are knowledgable, so don't think I'm trying to discredit you or what you are saying. That would not be true.