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        Cool castor oil or synthetic

#1 bogas Mar 08, 2005 02:40 PM

castor oil or synthetic
Which fuel to use? I've read articles where some say castor oil will gum up the carb.
A newbie thats ready to run in a new engine. What fuel would you recommend?

#2 ivanc Mar 08, 2005 04:06 PM

What's your engine? The manufacturers will usually recommend the type of fuel for their engines in the manual.

#3 mcflyboy Mar 08, 2005 05:45 PM


#4 clipclop Mar 08, 2005 06:25 PM

As you are a newbie, I would recomend castor based fuel.
Reason ? well castor will protect your motor better against a lean mixture setting.
synthetics are equally as good ,--- provideing the temp of the motor is within normal limits , but dureing a lean run the temp will climb and synthetics become useless as they vapourise . it is this vapouriseation that allows synthetics to burn with the fuel and not leave the oily mess out of the exhaust that castor does.(only bad point)
A good article on oils can be read hear:- http://archive.dstc.edu.au/BDU/staff/ron/
click on FAQ in the list ,left , then scroll about 25% doun to the synthetic oil Q?
Verry informative based on "REAL" facts, to quote a few lines :- "In spite of all this, the synthetics are still excellent lubricants if you know their limitations and work within those limits. Used properly, engine life will be good with either product. Cooked on a lean run, castor oil will win every time"

#5 bogas Mar 09, 2005 12:44 AM

My engine is a O.S. 46 ax
LHS sold me castor based fuel,but after reading alot of info, just unsure which way to go.
Boy this is a tough sport to break into. Thanks for the replys.

#6 bogas Mar 09, 2005 01:38 AM

Hey Clipclop. I read that article from the site you steered me to.
Very informative. I'm sticking with the castor oil for now. Thanks alot buddy
I can sleep tonite. Thanks again !

#7 smedsky Mar 09, 2005 08:12 PM

For a bushed engine Castor is mandatoty. For a BB engine syn is fine but a little castor will help prevent some long term rust.

#8 GregG Mar 10, 2005 08:10 AM

Bogas and Smedsky, Welcome to RC Groups! :D

#9 FenceMagnet Mar 12, 2005 08:33 AM

synthetic fuel with a few % castor added will go a Looooooong way to protecting your engines.... I recently picked up flying again after a 3 year absence.... my wife passed away then and flying was not on my mind for a long while.... well, I'm married again, and she talked me into resuming my hobby.... I had 4 or 5 planes hanging in my workroom, and they had been hung their the last time I went flying.... no preparation or after run oil or nothing.... after working them free with some wd40 and a hairdryer (can't seem to find that heat gun!!) I lubed them with some MarvelMystery and went flying..... not a hitch, they all run great and no noisey bearings or anything... I credit that sticky film of castor that remained in the engines for protecting them from time and corrosion....


#10 staggerwing Mar 12, 2005 09:32 AM

Yes to castor
Synthetics will leave a residue that induces moisture,a fact was proven yrs ago. Castor will get gummy ---but only after YEARS of sitting, but that film will protect your engine during & after running.
The same synthetic problem goes for gas engines------use a proven natural petroleum based oil for mixing IE Pennzoil For Aircooled Engines---proven from many years in the ultralight industry for max protection w/ low carbon buildup.

#11 50+AirYears Mar 13, 2005 02:22 AM

Had a ball bearing engine sitting with a plane in an Oak tree for almost a month.. Water coming off an Oak tree during a rain gets very acidic. Since I always use a high percentage of Castor, after I got this plane and engine back, I poured out the very brown water, and found out that there was no corrrosion inside the engine, event though some other metal parts inside the plane that had gotten wet were pretty well corroded, including the landing gear wires and a couple servo connectors.

#12 GregG Mar 13, 2005 07:39 AM

Jimwhite, Welcome to RC Groups! :D

#13 FenceMagnet Mar 13, 2005 04:03 PM


Originally Posted by GregG
Jimwhite, Welcome to RC Groups! :D

thanks :D

#14 ivanc Mar 14, 2005 08:30 AM

I'm using the pink Omega fuels that contain both castor and synthetic oil and I'm happy with it as well as my engines are. I'm using it for all my engines - most of them are BB 2-stroke, one bushing 2-stroke and a OS FS70II 4-stroke.

#15 Vette Mar 16, 2005 02:30 PM

I too have always used Morgan's Pink Omega, it is the best of both worlds IMO. :)

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