Why Castor Oil ? (Full Version)

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CrashBang -> Why Castor Oil ? (4/29/2002 8:13:53 AM)

Just picked up a low time used Moki and it is obvious that the previous owner ran castor mix in it (as recommended by Moki) Why run castor when the only result I see is glazed cylinder walls, stuck rings and screwed up ring end gap plus the god awful mess it makes on your plane? I have run all of my engines on 100% synthetic with after run oil when storing and had no problems for years. Some of these engines have been used for many years with no ill affects due to the oil type (Klotz Techniplate) I relize that the castor has a higher flash point but if you don't run it to lean and have enough oil content that should'nt be an issue.



THOMKP J -> Why Castor Oil ? (4/29/2002 6:23:17 PM)

I KNOW SOME FLYERS AT OUR FIELD THAT FLY MOKI`S,AND THEY RUN THERE`S ON FUEL WITH CASTOR.THEY SAY THAT`S WHAT THE MANUFACTURERS INSTRUCTIONS SUGGEST!



downunder-RCU -> Why Castor Oil ? (4/29/2002 8:25:17 PM)

Well if it's low time and got the sort of damage you describe it can't be the fault of the castor...I'd say the engine's been badly mistreated. I must admit I can't understand what you mean by screwed up ring gap though..the gap can only get larger and that only happens with wear.
I've run ringed engines on 25% castor for years on end and never had any sort of problem like stuck rings...never had a rust problem either :)



Fuelman -> Why Castor Oil ? (4/29/2002 11:24:08 PM)

If it is gummed up as bad as it sounds, the previous owner may have been running it on very high amounts of castor and running it way too lean as well.

Castor is an outstanding lubricant in any engine, thing is- too much of it can lead to excessive gumming if run too lean. In any ringed engine, I like between 2% and 4% castor in the fuel. It's enough to keep the rust away and provide a lot of additional cushion for the rod journals. The balance would be synthetic. Using just 2% to 4% castor will not gum anything up and still give you some decent lean run protection. That little bit is easy to clean off the plane too.


Fuelman



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