12xlr8
Posts: 2
Joined: 8/30/2007
From: Wayzata, MN, USA
Status: offline
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I must have another user name here, lol, but for some reason, I have too many hobbies, and I don't post often here, mostly just read it. I think my other hobbies are running low, and thier forums are in a lull, so I took a guess at my log-in, and apparenty, I have not posted at all here with this one, lol. But, It's time to start posting here, as the topics seem real good here, so guess I'm ready for a change of scenery. ....But, I guess I'm pretty much of a newbie.... here...lol...).
I just posted this in a YS thread, and it applies here too, so I'll just cut and paste most of it here. (Since it's a good mainstream topic, and that post I just made will never be seen by most in a YS off-chute thread).
As a long time YS (and 4 stroke guy), I actually save a couple/few bucks a gallon by mixing one gallon of Wildcat 20/20 with one gallon of Wildcat 15/18 (PURE synthetic), which of course leaves me with 17.5% nitro and 19% pure synthetic oil. (accurately mixed, and consistent too, because you are using full gallons of accurately mixed fuel). (The idea can be used with many brands, but the gist is the same, lots of synthetic oil for the 4 strokes.)
On a hot and humid day, you can get some much needed snap back, by dosing up to pure 20/20 without any re-tuning, but, by and large, you can't tell the difference in performace from straight 20/20, and it saves a few bucks a gallon. At 6 flights per gallon, it adds up money wise, but leaves you with plenty of oil (which YS crank cases like, as do all 4-strokes).
IMO, (after hundreds of teardowns) Castor has no place in a 4 stroke, it just gums up the valves, (and other things too). Modern synthetics have many times the lubrication, and corrosion prevention of castor. Castor is obsolete with 4 strokes IMO. I have found pure synthetic Wildcat leaves very little buildup on the heads and valves, and corrosion protection is the best I've ever found, and it shows every time I tear one down for maintenance. But most any pure synthetic is a good choice. I use the same mix in all my 4 strokes, big and small, and I never suffer failures, or gummy build-ups, nor failed glow plugs.
No after run needed IMO. Also, never run a YS (or any model engine, for that matter) dry. The "alcohol absorbing moisture" argument is moot IMO. The alcohol and moisture will evaporate from the hot engine quickly, and only the oil will remain behind to protect the engine. I think those who run engines dry, are foolish. It reaps havoc on the rotary valve (on a YS), (a little bit at a time) every time you run it dry, and leaves no oil behind for corrosion protection (far less anyway), which is a primary function of oil (corrsion protection). Burning it off dry every time you shut down the engine? Great idea?.....Negative. leave it sloppy and oily. The leftover nitro won't corrode it either if it's well oiled and the ingredients are quality and pure. If it's bone dry, then, yes it will.
Remember, manufacturers are playing to a world wide crowd. Many countries can't get nitro at all, or good synthetics, or whatever, so they have to leave the "castor oil" door cracked open, as well as nitro percentages open, not to mention cover their behinds with oil percentages, since qualitys vary widely. If they want to play to a world market, they have to cover all the bases. But if you are looking for the best performace.... Pure synthetic oils, with the purest ingredients will yield the longest life, and best performance, and the numbers can be skewed accordingly. IOW, you will never burn up a 4 stroke using a quality modern profesionially mixed 15/18 pure synthetic fuel, no matter what the book "recommends", unless you run it stupid lean, at twice the designed RPM's, and burn it off dry every time you shut it down. ....But in East Never-never land, where they mix fuel with wooden cups out on the sandy desert farmland, you will need that oil...... Know what I'm sayin? ....
Castor is so WW-I... High revving 2 strokes? ...maybe it still has some use, but even that is questionable... It's extinct in modern 4 strokes IMO.....Synthetic oils are superior in every measurable number across the board, castor is just a gummy, old school mess, that goobers up valve trains, and carbs and pumps. It's like "Leaded Fuel" for your car. It served a purpose "once upon a time", but I can't think of one useful quality it offers as an advantage over a modern synthetic in a modern 4 stroke R/C engine.
Nothing like diving in with a "sure to be" well opinionated, frequent, and hot topic?
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Best fuel for 4-Stroke glow engines - 
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