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GUNSHIPGUNNER -> Do you use pressure on your fuel system? (12/27/2001 5:03:27 PM)
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It's interesting that YS decided to pressurize their 4 strokes long before they began supercharging them.
As the YS engines line was initially developed for pattern flying, the need for instantaneous throttle response was a given.
That is why YS and most other 4 stroke engine makers suggest you use either pump, crankcase or muffler pressure.
As for "complicating" things I must be missing something.
Every fuel tank requires at least 2 lines. One to provide the fuel and one to vent the tank. If you don't run muffler pressure then
the vent line STILL needs to go somewhere and unless your careful fuel will pour out of the vent line when the plane is in certain attitudes (such as inverted). Running muffler pressure completely prevents this and gives you something to do with the vent line to boot!!
Regarding the use of castor oil. As I stated in an earlier post, I read a lot about what it is I am doing at the time. This way I don't need to re-invent the wheel. I use and have been using a combination of synthetic and castor oil for over 32 years in literally hundreds of engines.
Go on the net and look up the writings of the most knowledgeable engine makers and developers. Clarence Lee, Dave Geirke, and the list is almost endless.
They ALL advocate the use of bean oil in both 2 and 4 stroke glo engines.
Bean oil provides at least an additional 100 degrees F. of protection over any synthetic oil presently used in our engines.
No other substance know to man provides this protection and this is the main reason most of the notable engine Gurus recommend adding at least 2 ounces of Castor oil per gallon to any glo fuel that doesn't already have it in the ingredients.
Another important reason these same fellows suggest you use some bean oil in your fuel is the prevention of corrosion. Corrosion of the engine internals caused by the fact that Nitro actually attracts moisture. After run oil helps prevent this but I for one don't always take the time to use it after every run.
BTW: There is a subset of RCers that REALLY like to spend big money on our hobby and run their engines harder than any other group (except maybe pylon racers) The helicopter guys. And most of them DO NOT like to use ANY bean oil in their engines.
But ask one of the top chopper pilots just how often they rebuild or replace their engines. And it's a well know fact that this shortened engine life is primarily due to lubrication failure.
A quick note regarding pressure and helicopter engines.
EVERYBODY uses muffler or pump pressure on their helicopters. It is a MUST to have a reliable mixture during a run as they run their engines so close to the ragged edge that going slightly lean will destroy a $300.00 engine in a few seconds. And the only way to insure a consistent setting is with a pressurized fuel system of some sort.
Anyway, use what works for you but don't do it just because you want to be different or a 'rebel" . So many guys need to be different so they latch onto an idea that is different from the conventional wisdom in order to stand out in the crowd and be noticed. Maybe in hopes of others thinking them smarter than the rest.
I did that for years and it only cost me time and money. And to be honest I would ALWAYS go back to the way of conventional wisdom as soon as my ego allowed and my pocket book required!! I no longer "need" to be different and I sure don't need to re-invent the wheel every time out.
Go read and find out what really works, not what YOU want to work and then use it. I seem to have a lot more fun and a lot less stress by doing it this way!
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